A Discussion About Automatic Transmissions, Valve Bodies, Types Of Shift Kits And How They Work
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- เผยแพร่เมื่อ 3 ก.พ. 2025
- At the heart of every automatic transmission are a system of planetary gearsets, which are simple devices that predate the automobile itself. The template for the modern automatic was found in the earliest Model T Ford's.
The transition to full self shifting came about in 1949 when Engineers at GM combined the planetary concept with a hydraulic brain called a Valve Body
While modern transmissions rely on computer controls for inputs, they still use the basic Valve body as designed by GM to control the mechanical functions inside the trans.
Here's an overview of their history, basic functions, differences between valve body types and the levels of modification available to make the transmission best suit the purpose it's going to be used for. @coperacingtrans
#automobile #diy #technology
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The fact you are always off script (because there isn't one) and go on wild tangents is a huge reason why your channel rocks. We can learn more from tangents as bonuses, than is often taught now, and your stories are always awesome.
I agree, I really enjoy his stories. Makes it very interesting
I always say that. I'm here for the rambling.
exactly
At work, I often try to get important points across, and always end up trying to convey my years of wisdom within a few moments.
Tangents are the wisdom of the story. They reinforce the important points, and provide color to an otherwise black and white canvas of information.
I can teach you how to build an engine, but I *WILL* tell you every time I had to split a block because I forgot the balance shaft or couldn't pull the timing chain through the gallery after the head went on.
I had Gil ("Mr. Shift") Younger, "reprogram" my Ford FMX valve body in 1971. It was for my 1969 351 Mach 1 that I ran in NHRA Stock and Super-Stock back in that era. I was but eighteen years old at the time. I won my class more than once and never had a failure. I retired the car from the racetrack and after 1972 the car just saw street-duty. I am now seventy-one and still have that car. The transmission continues to perform flawlessly. After that valve body, He did others for us and we purchased reprogramming kits and components from His Company, "Transgo." Thank you, Gil - a.k.a. "Mr. Transcendental Meditation" Younger. I miss our conversations. Brilliant, Peaceful Man. Still at Peace while at Rest, I'm sure.
Gil was pure genius, I'd had the exact same luck with his work and his TransGo line of products.
I still buy only their kits to this day.
Gil = Guru!
The Trans-Go “No Yo-Yo” shift kits made automatic transmissions live through the 1980s. Trans-Go is still going strong, and their shift kits are still pretty awesome. I installed one in a 4L80e early this year. It shifts great!
TransGo instructions are always fantastic. Always full of little extra things to check and advice on how to avoid common mistakes. They always end with Gil saying something like "You will love the way it shifts and your customer will KNOW IT WAS FIXED RIGHT"
I never understood automatics when I was growing up until my Dad told me one day "Look boy, its simple, Pressure vs. Speed. The pump and the governor are in a never ending bar brawl. The current winner gets to pick the gear". The light went off in my head! LOL. He also taught me that slush-boxes were by design destroying themselves with slow shifts. And fast shifts were actually better for longevity.
Wow. That explanation really hit home. Your Dad is a genius,
As a former tech, I can say that was an excellent explanation of a topic that many people find mysterious. Good job. I would only add that a shift kit typically extends the life of an automatic transmission.
In about 1968 as a kid of 8 I helped my dad rebuild the Roto-Hydramatic in my grandmothers 1962 Olds 88. You have not lived until you have worked on one of those. My theory always was that GM transmission engineers sat down and decided to make the absolutely most complex transmission ever!
Mr Shift/ Trans-Go are always my go tos. They have never let me down.
You're right, Tony - this is the PERFECT time to have a discussion about automatic transmissions.
Because setting up the camera, fooling with the lighting...all this lets you procrastinate just that little bit more. I feel you, brother.
👍
Initially I was terrified of working with auto transmissions. They seemed like such an alien art, and being as young as I was even 10 years ago, I felt that it was something that had so much advancement before I even took interest that I'd never properly catch up, nor get to a point where I could properly understand what was going on.
The one thing that changed was having an unsalvageable GM 4L60E 2WD transmission that I found in a junkyard and paid $30 for (previous owner had windowed the barrel close to the tail housing, so it wasn't worth saving). I picked it up, put it in the bed of my Tacoma, took it home, and put it on a bench. After that, I took it apart piece by piece, and took the time to just look at what it was I was taking off, and trying to understand both that piece's purpose, and why it was placed where it was. Took me a few afternoons, but eventually I got to the point where it was completely taken apart, and I had at least somewhat of an idea of what was going on.
For me, I break down automatic transmissions into a few 'areas', or 'zones'. The bellhousing, the pump, the barrel assembly, the valve body, and the pan/pickup. Funnily enough, one of the first things I picked up was the clutch packs, because I'd dealt with motorcycle wet clutches since I was single-digit age working with my dad on my KX125. Once I had that figured out, I took a deeper look into the valve body and started making sense of all the fluid pathways carved into the metal, along with the location of all the servo valves, and started figuring out what would happen when a valve opened or shut. Wasn't too long after that when I found the inlet and outlet of the pump, and understood how fluid got into and out of the valve body, and where that fluid was routed when entering the barrel portion.
I'll admit, the actuation of the planetary gearsets is still a slight mystery to me (I understand the concept, but can't quite grasp the real-world analog just yet), but I've made sense of nearly everything else, so at this point auto transmissions are no longer the mystery they once were. As I've gone on, I've realized that the vast majority of automatic transmissions operate on nearly identical principles with assemblies and sections in almost identical locations.
I'm just happy that I'm at a point where I can look at an auto trans and no longer feel lost or out of my depth.
That was fun. My daughter and I were talking transmissions the other day and i was glad to see Uncle Tony give his class on automatics. I'll have her watch this as a precursor to us tearing apart the C6 in her F250. She's 12 and wants to do it all. Which is especially awesome because I turn 50 next month and it's nice having the energy and help of young blood in the shop.
Stay free
I've been in the transmission business since the '70's. I have been blessed to not only talk to "Uncle Gil" as I've called him forever but I had the random chance of having lunch with him when I attended a seminar he was putting on! I thought you might like to learn about modern automatics. Your Torqueflite is a real world example of a Rube Goldberg device. Chrysler had a convoluted approach to electronic controls so I'll refer to more conventional ones that let the computer directly control when the shift valves move. That was the second phase of automatics. The third phase is a shift away from the early method of gear changes (see what I did there?!) and I give Chrysler full credit for introducing the industry to this though not surprisingly in a more basic way. Their 604 (I think the first year was called Ultra drive or Ultramatic) started the truly adaptive control of shifts (not just bumping pressure if the shifts got too long as others did). The latest units via "flow controlled" solenoids not only control when a shift occurs but how it shifts by changing the apply and release of individual clutch packs. And here's the kicker: They can shift as quick (or quicker) than a Reprogramming kit and still be smooth! Truly remarkable. I thought you might appreciate this.
Your timing is perfect. I just finished freshening up a 904 I purchased for my V8 MGB Roadster project. The trans turned out to be from an 81 Imperial although I purchased it from a guy who had it in a '67 Belevedere with a hot 360. He was swapping to a 4 speed. He recommended I go through it (which I planned on doing anyway) and for good reason. I purchased it as a core for $100 including the torque converter and driveshaft. Going through the trans all the hard parts looked good but as expected the kick down band and all the clutches were shot. Steels were surprisingly in good condition though. This trans is one of the 5/4 clutch style 904s which was a surprise and of course it's a lockup given it's an 81. The real surprise was that it already had a shift kit installed. All I really had to add was the accumulator mod to block it in the down position. Buttoned it up today and it's ready to go. Now on to rebuilding the '89 roller 318. This little MGB will scoot when it's done. Oh, I forgot front and rear disk brakes and a narrowed Ford 9" diff. Thanks for sharing all your Mopar knowledge. Big fan ever since you started your channel.
I like how you explained how a shift kit works and what it does while keeping the explanation simple enough for a newbie to understand the basics of it.
Thank you UT, very informative, but as a side note I am gm factory trained in auto transmission repair, do not put the metal check balls in magnetic dish, the spacer plate is made of steel even tho the valve body is aluminum, if the balls get magnetized yer gonna have some weird inconsistent problems, ask me how I kno 😊
This is important!
I’m extremely grateful for all the information and wisdom you share Uncle Tony… you helped me fix my first slant 6 and taught me so many other incredibly important skills… I remember when I first started learning there were no videos like this on the internet…. Incredibly useful important information!! Thank you for everything truly!!! ❤❤
This is one of the best channels. I'm self taught car guy, and this is compatible with my learning style.
I put my first shift kit in my truck’s 4L80E last summer.
It was one of those full kits from trans go.
Replaced the reverse piston too, to get that back working.
Cleared out a area on a very clean work bench.
Followed the directions. Took my time.
It worked out great.
Was very happy with the results.
Had one behind a turbocharged 350 with 900hp couldn't get it to shift 1-2 under full boost, but 4L80e is a great box it's a 4 speed turbo400
@@v8xbeast yep. Great trans for sure.
Mine was just in a stock silverado, but it worked great.
Had a reverse flow manual valve body in my 440 GTX back in the day. Lots of fun from 1st to 2nd. Would almost snap my unaware friends neck.
Used to hang around Milburn Varner when I was a kid, local legend. Master at reverse manual valve bodies, got to ride on some FAST test drives😁
It is always a learning experience to listen to you talk about mechanics.
Wow, I honestly always wanted to know this but the knowledge was too esoteric; thanks again for the neverending education, Uncle Tony
Tony, thanks for the video, but a couple things. The hydramatic came out in 1939, it was put in a few cars during that time. It was a cast iron monster, I had one that came out of a 1941 Olds. I think it weighed more than the engine. The other thing is Ford used the planetary gear set on other cars before the T. The design went back decades. What made Ford's version unique is it allowed the means to produce an inexpensive vehicle with good performance and ease of repair.
My grandad used to tell stories about when he learnt to drive in an old and tired Ford Model T, or the pedal-Ford as they called it on the farm where he grew up. He had to stand while driving, because if he sat in the seat he could not reach the pedals. From he was 11-12 years old the others at the farm started sending him out to do errands and shopping. When he was old enough to take his drivers license he drove to the governmental facility himself. By then he had his own car, which was a 1939 Willys Overland. Everything was done in a few hours, and he got his license the same day. He told that he remembered that the instructor reeked heavily of alcohol. Some time in the late 1950s (I think) the Ford broke down. Back then it was just seen as old junk, and parts were not exactly easy to find far out in the Norwegian farm country. So they flattened it as much as they could with a big sledgehammer, ran over it with the tractor and buried it behind the barn. The remains are probably still there.
One thing we forget that that automatic valve bodies took a while to be added to all planetary-style "auto" transmissions. As late as 63, Buick was still using their Dynaflow system, with a fancier-than-usual version of the torque converter (with 2 turbines and stators) attached to a 2-speed trans - but first gear was only obtained manually. Their idea was that the torque converter would let you stay in top gear virtually all the time, so first was more or less optional for the driver. Lots of people complain about how slow these cars are off the line, but most don't even realise that they're taking off the line in top gear (with a 1:1 ratio) as first gear has to be manually selected.
Model T transmission. The grandfather of Lenco!
Finally, the video I've been waiting years for you to do.
I'm an auto trans specialist, I love all the valve body stuff even developed my own shift kit for ford 4 speed (Australia) great video mate
I remember back in 1987 putting a B&M shift kit in my Turbo 400. Yep its a messy job and I had no experience but got it done. Did most of it lying under the car with no clean bench and no TH-cam or internet for that matter... Just read the instructions. Now i feel I have to watch videos before i do anything new but back then you just dove in.
The absolute best channel to put on while eating my lunch. Learn so much
personally i enjoy when you. go off topic and your viewpoints are said. as a 32 year old its nice hearing viewpoints from a open minded and interesting (boomer) lol. nothing but respect
You do have more knowledge than average from your life experiences.
Nice content.
Good luck with the transmission.
In high school in the 1970's, I had a 1969 Roadrunner street racer, with a 727, a Turbo Action 3800 torque converter, a Winters shift kit, but not reverse shift and Winters gate shifter. I used a small trans cooler, not run through the radiator and added a drain plug conversion to the standard capacity trans pan, because it required frequent fluid changes to survive. Right now, I am building a clone 1969 Roadrunner coupe of it, with a Hellcat Jailbreak engine, with a GM 4L80E transmission and a new Winters gate shifter for the 4L80E trans.
Thanks mate, I rebuilt a T700 and one thing I did was get a thick piece of glass and glued some wet and dry sand paper to it to straighten out all the mating surfaces. Pump, valve body and the case, you would be surprised just how warped all that can get. Thanks for your time to do this.
Uncle Tony and John Cope taught me everything I need to know
AWESOME vid..... Take it from a retired trans guy, you did good here....MOPAR 4 EVER.
Excellent Tony! One little tidbit FWIW. General Motors introduced the Hydra-Matic to the public in 1939 in the Oldsmobile line. The development money came from the US government as the first usage of the unit was in the Sherman light tank. It used two flathead Cadillac V8’s with a Hydro behind each one.
I tell you what Tony you still produce the goods my mopar mentor ❤.
I'm 60yo have been a gearhead since about 14or15 and that was an awesome education you filled in many blanks I've been following you for years and still you are only channel ( except maybe scarf and goggles and just rolled in ) that I wait in anticipation for new content . It almost feels like an old friendship 😊
Being a glutton for punishment comes with satisfaction when it works the way it was supposed to and you did it yourself Nice to take pride in that. I've been Mechanic for 26 years I own my own shop. I've built transmissions for myself I do not build them for customers because I do not want to do it twice. So I check my ego And I send them to transmission specialists that will warranty the productAs far as that stock rebuild goes. But that being said it's not that bad if you just follow the instructions. My dad told me when I was a kid when you take apart transmissions anything that has a Central shaft get a broom handle And orientate everything you take apart down that broom handle in the correct direction As you take it apart. It will make things weight easier I still do it to this day. I also built a Turbo 400 for myself a long time ago Misplaced put a check ball in the wrong spot and only had second gear. I took that thing apart so many times I had to order a new Shiftkit with Gaskets an another set of instructions to get it right. Was a pain. But I will tell you if you have a local transmission shop. You bring the rebuild kit the shift kit and the transmission it's usually not too expensive to have them put it together correctly. guys that specialize in automatic transmission know a lot of little tricks to make your build come out awesome.
Automatic transmissions are a marvel of engineering
Not really. Lol. In the aspect of engineering, it's incredibly simple.
@@sergeantspeed5941 ummmm ok...build one ...put your money where your big mouth is
@@sergeantspeed5941 dude, you couldn't duplicate the valve body alone and you know that.
i had great luck with fairbanks shift kits back in the 80s. street and strip kits in fords , plymouths, and GM s brings me back in time
I had a '72 Duster that I built up breathed on 360 and a 727. I decided it was going to need a shift kit. I bought a kit from Mopar Performance. It had 3 levels to choose from. I picked the middle level since it was going to be a street car but with a moderate level of performance. I don't remember now what I did exactly but I know I removed one check ball and replaced a spring with heavier one supplied in the kit. I was glad that I didn't go with the maximum. The level I used would bark the tire with a very moderate level of acceleration. I didn't think it was very complicated to install and the results were impressive.
Back in the late 70's I built a turbocharged small block (350) Camaro. I used a 400 transmission and eventually put a B&M trans pack in. It made a huge difference, but what a pain in the ass! I swear, my brain nearly soured putting that valve body together! Lol
Such memories, 🎉Uncle Tony! Me and my buddies always used B&M shift kits!
That takes me back, the first serious piece I bought for my 69 340 Swinger, in 70 I bought the Hustle Stuff complete full manual reverse pattern valve body, and a bit later a B&M converter. This was a street/race/street race car, and nobody I came across had anything quite like it, guys used to ask me to take them for a blast so they could experience those shifts, about as far from the Powerglides they were familiar with as is possible.
Thanks Tony, Lot's of memories!
I found the Transmission Bench series of videos and they seem to be very complete and comprehensive. I have a 46RH from a RAM I'm going to rebuild for my E-body, and between those videos, the ATRA updates, Sonnax update parts information, and the relevant ATSG manual, I'm pretty sure it'll turn out ok.
Years ago I found a book called "Fundamentals of Automatic Transmissions and Transaxles" from Chrysler Service Training and it was a revelation. When I read it, I understood how a Torqueflite worked. For a little while... Its hard to retain the knowledge unless you use it because its weird! But also amazing how well they work.
All I knew about automatic transmissions is that if you have a torqueflite, a C6 or a turbo 350 you have a good one. Awesome video!
A true wealth of knowledge.
Thanks for the advice! I’ve done shift improvement kits on a couple of GM transmissions before, just to save them from burning up after changing carburetors, and having the shift points all messed up. I smoked a TH 350, but it took like 7 years. Then, I put a 4 speed in it. Then it was an 86 , Grand Prix, that I ran about five years before the throttle brackets were available from Holley, and TCI. That 200R4 is still working well nowadays, but I really want a T5 in my G body. I’ve just acquired a 78 Dodge D200, with 73000 miles on it. It’s been very well taken care of. It just had a little water in the oil, so I’m replacing the timing cover , chain, and water pump. I’m also replacing the intake manifold gaskets too. I’m considering getting a shift improver kit for the transmission, but the fluid is still clean red, and the previous owner had a trans cooler installed already. I mean it was so well maintained, that he had a double roller chain installed. It has some stretch, so I’m replacing it. The problem was that the cover leaked, and that’s why I had water in the oil. I figured that it was also a good idea to do the intake too. It’s been sitting for about 20 years, and once I got it home, I poured some gas down the carb, hooked up a battery, and it started right up. I replaced the master cylinder, cause it was bone dry, and had a lot of sediment in it. After that, the level in the reservoir never dropped. I know that the brakes need bleeding, but I was able to move it, and stop it. I’m new to these Dodge machines. There’s a lot of different ways things are done. It’s like learning all over again
Serenity now Tony. Serenity now.
I just ordered a manual valve body with trans brake from Lentec for my aod. Perfect timing on the video.
Ohh crt transmissions!! I lived a few miles away from his shop in lowell indiana. Hes been there as long as i can remember on us 41.
My dad was the same way. He was a very competent mechanic but he HATED automatic transmissions and couldn't quite explain his hatred other than they have too many little parts and springs and check balls. He clearly hated the valve body 😅
Thank you for the great explanation to us beginers on how the auto shift kits and T models work,you wont see to many T models stolen and now i know why😅.Thank again Cheers Stephen👍🇦🇺
Thanks for the info UT!
As usual, this is very useful information to have for someone like myself trying to figure out how I’m going to build my car👍
One thing about automatics, you can build them up or do whatever repair, go through them with fine tooth comb or even magnifying glass but still won't know how they work until you install them fill them with fluid and see what happens. I heard a long time ago (how true it is l don't know) that the engineer who designed the original GM 700R4 (later 4L60) went nuts trying to get to work. Thanks Tony for a great video!
Good seeing you at Moparty!
Cheers for the new tricks for this ol dog.
Imagine the meeting they had where they said “let’s make a transmission that you don’t need to shift gears in” then the team of designers equipped with pencils, paper and a ruler came up with what we have today, it really is incredible, and this is coming from a guy that hates driving automatics with a passion 😂
Great info Uncle T. 👍🏻
Thanks uncle, needed that
Great description and history of the automatic trans. Listen to Uncle Tony about cleanliness and distraction free when assembling a valve body!
Thanks UT, you did explain it to this novice. Good luck!
Good information. Had the local guru rebuild my transmission. Holy shit that transmission totally surprised me. Wish he was still around to freshen it up .Bottle Rocket needs to come out and play.
great vid very informative
I've rebuilt a few transmissions in my home garage over the years, from a 60's vintage to early 2000's. Definitely a challenge, but doable if you take your time, follow a factory manual and keep organized. Valve bodies are the same. Make your automatic run the way you want.
I've yanked my transmission out (th350) to install a shift kit, only to find out, it already had one.
When we were kids, my buddy jacked up a shift kit in his 72 Skylark with a th-350.
When he was done installing it he had no 3rd or reverse 😂
When that trans nuked he put a stocker in and sold the car, they really put him off but then he wasnt the smartest tool in the shed when it came to mechanicals.
I remember back in the early seventies I watched my father working on his trans and he had the valve body out(no idea why, probably just cleaning it). And I thought wow, that looks like a complicated procedure with lots of parts to keep up with. Well, just a couple of years later I had the valve body out of one of my first cars to install my first shift kit.
Nice vdo. Slag hammer has the sickest stance. Wheel alignment next street sport n Trac
Alls you need for a shift kit is a drill bit the old Chilton's manuals showed you how to do it
There are diesel guys who have rebuilt 727s and 518s in the back yard on a sheet of plywood.
They say a couple special tools and the FSM make it easy.
I 1st learned to REBUILD automatic transmissions on my AMC TF-8's & TF-6's
before long I was rebuilding my buddy's PRO-STREET 727's
Love the MOPAR Transmissions
COOP
...
Waited this video for years you are the best . Love from quebec
Great video. Thanks for sharing!
Different thing, same personality short coming. As a guitar player, I love working on amps, old vacuum tube ones, even built them from a pile of parts and built the cabinets.
Absolutely hate working on guitars, even changing the strings, unfortunately my go to guy on that is retiring. I'll have to do it now. 😂
I have a 727 behind my mildly built 318 with kevlar bands and a Trans-Go street n strip shift kit in my 82 dodge D150 it definitly shifts hard but not as yards as a competition shift kit or full manual valve body but I love it and the less gap between shift that the transmission does on its own will cause the bands to last longer . I plan on dropping in a racing 904 in my 65 dart full manual valve body 💪🏁
Great one tony! Thank you.
You’re doing the valve body because you love it! No matter how much you say valve bodies are a pain, and they can be, you love the brain food. The exercise of your gray matter. Me too!
SELECT PERFROMANCE FROM LONG ISLAND NY IS THE BEST. HE HAD THE FIRST TRANSBRAKE FOR THE TURBO 400 BACK IN THE 1970'S
Thanks U.T. A follow up regarding the weird buick stuff might be in order. Also, for anybody interested, look at Manitowoc engineering VICON system, variable converters along with independent throttle control. Certainly not hotrod stuff but I digress... Cheers!
I built a 45rfe for my 02 Dakota in 2020, it’s still in the bed of the truck waiting to be installed. I’ve put another 35,000 miles on the old slipping tranny, waiting for it to die on the side of the road.
Send her home with a burnout this Friday and you'll have a good weekend project
😆😂🤣 I've done that with a battery. But a whole automatic transmission? I ain't that good!
Very helpful! Thanks
Automatic transmissions and carburetors are both mechanical computers.
Glad you did trans video, thank you, it's the only thing on my car i didn't touch and kinda sucks i can say i done all the work... Well except the trans
Love this stuff.
I have a ‘58 Sport Suburban, with a 528 stroker wedge. It has a ‘65 cable shift trans, ( so I still have pushbuttons) with a reverse manual valve body.
Now I wish I had a MANUAL 4 or 5 speed, or EVEN a 3 on the TREE! Never got to drive one of those but willing to give it a go...
Gears are too far spaced out on 3 speed manual transmissions unless you drive on ruler flat roads everywhere or it's backed behind a very torquey, large displacement engine. I drove a 1973 Dodge D100 with a 3 on the tree and going up even a small your choice is to scream in 2nd or lug in 3rd. Not recommended, you didn't miss out.
I got a used th 350 to upgrade my 67 el camino (2 speed) so grabbed one from a wrecked chevelle score ! it had a barker stage installed ,it became a addiction to get that 1 to 2 scratch, that made people turn to look! barrrk ,that transmission never gave up, probably still moving some car some where ...
I messed with a lot of trans back in the 70's as a teenage. I worked out that the Powerglide just needs more power. The C4 needs a gov change or delete. The standard 727 reverse gear was easy to break.
I knew a guy that could greatly improve a c6 with making holes bigger and stuff from the hardware store. It was,crazy!
Mr. Shift 😅. "Ethical shifts/ethical performance enhancements." 👍😇🚙💨
I agree Tony, it is a pain to crawl under the Ramcharger and work on the 727. Can`t stop the fluid from getting on everything. But I gotta pull my pan and see why it started shifting from 1st to 3rd gear. Rechecked the kickdown adjustment, no change. Dreading it man, dreading it,.... But I gotta do it.
I’ll gladly work on anything and generally always enjoy a challenge, but as far as automatic transmissions go I’ll change the fluid and filter and that’s about it, I want nothing more than that to do with them. There’s guys out there that enjoy those slush boxes but not this guy, I’ll change out a clutch any day 👍
Broader Performance Transmissions is the go to for me. He can do a C6 that barely uses any more parasitic loss than a C4.
Procrastinate working on an automatics transmission by making a video about procrastinating working on automatic transmission.
Yes, that is Tony's ethics in play.
Used to love the B+M shift improver kit that came with a drill bit.
Its a bent drill bit, but its a drill bit because you dont have that size 😂
Good stuff
A 727 makes me nervous I even put off watching this video 😂
I thought about doing a shift improver kit in my Buick. But I never got around to it. Kinda glad. Cause I'm a procrastinator. I'd probably never get the transmission back together 😅
I did the tran go at 16 years old. Went and got a stock 727 valve body the next weekend I Fd up so bad. Lol
I rebuilt my A727 and put a shift kit in it. It has first and reverse. Thinking about cutting a hole in floor to check band adjustment. I might not have the valve pressure adjusted right at the carb either. I even watched a video while rebuilding it.