GM Hydra-Matic 6L80 / 6L90 Power Flow
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- เผยแพร่เมื่อ 20 ก.ค. 2024
- Weber State University (WSU) - Automotive Technology Department - Transmission Lab. General Motors Hydra-Matic 6L80 / 6L90 6-Speed Automatic Transmission Power flow. This transmission is typically used in 2007 and newer Chevrolet Corvette and Camaro, Cadillac CTS-V, and Chevrolet and GMC pickup trucks and SUVs with gasoline engines. This transmission uses a simple planetary gear set to drive a dual planetary gear set (with a common planet carrier and internal gears) to achieve six forward gears and reverse.
This video helps demonstrate NATEF Task A2.C.10. " Diagnose transmission/transaxle gear reduction/multiplication concerns using driving, driven, and held member (power flow) principles.", a priority 2 task.
www.weber.edu/automotive
This video was created and edited by John D. Kelly at WSU. For a full biography, see www.weber.edu/automotive/J_Kel...
Donate to the Department of Automotive Technology at Weber State University here: advancement.weber.edu/Automotive
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@56arbee Hi, that is a great argument, I agree with the "Ravigneaux type" description even though the planet gears are not physically connected as in a traditional Ravigneaux gear set. If that is the case, then you could also argue that this transmission is actually a "Lepelletier Type" design which uses a simple input planetary gear set to drive a Ravigneaux planetary output gear set.
excellent video/teacher to understand the automatic transmission
Thank you! Awesome explanation. Subscribed.
@56arbee That is what I thought at first, but a Simpson gear set has common sun gears and these are separate sun gears. It appears to be two totally independent gear sets with a common carrier housing. The two ring gears can be removed seperately.
I maintain my 6l80 very well, at least in my opinion I take my truck to the dealer for major services to keep good paper trail and records filter replacement every 30k no flushes and this thing has been flawless I love feeling my shifts up and downward it tells me it's still there. If it's too smooth like any other transmission I feel its wearing clutches faster with the slower engage like dragging shoes on the floor versus picking up your feet when walking not sure if that's how it all breaks down but that's how it feels to me so far nothing but positive things from my transmission
Agreed. In fact, the ZF and the Ford 6R60 is the same design (but use separate 1234 and 3-5 R) housings.They utilize one piece long planets in the rear carrier. I forget where I read it, but I have heard them described as Lepelletier.
Right about the common sun gear in a Simpson. I knew that too. Silly of me. However, after studying this geartrain more, I still argue that it is a Ravigneaux or as Gears magazine calls it "Ravigneaux type." Even though it has two ring gears, they are not on independant assemblies. Therefore, any action on one of the planets in contact with the ring gear will cause a like reaction of the other planet on the same axle. The two planets act as "long" and the two idlers as "short" planets.
It is amazing how reliable transmissions are considering how many moving parts.
Agreed!
My 6l80 4/5/6 feels like neutral shifts smooth 1/2/3 and even into 4 and down shifts but 4/5/6 feels like neutral. I have a pressure switch stuck open code. I don’t tow with it or hot rod it I was interstate driving when this happen..... ??? Definitely getting some heavy repair cost 2800 etc only just over 100,000 miles
i work at stackpole and we make the parts on these its kinda cool
Hi, good observation, however; this is not a Ravigneaux gear set. The common planet carrier does not have long and short planet gears as a Ravigneaux does. This planet carrier has two totally separate sets of planet gears that are not connected to each other. The bottom gear set has an idler gear set to reverse the direction.
Hi like your video good presentation I have a question my 2014 camaro 3.6 automatic trans I believe is a 6l 80 and my reverse doesn't stay in gear when I try shifting to reverse its just weirdly moves into drive in other words when I grab my shifter to place it in reverse it just slides into drive like avoiding the lick into a reverse shift I can't even place it so to speak in reverse all else is good I think the reverse may have been damaged when I towed it and it was locked into park because of a dead battery but we pushed it off the trailer and the wheels were dragging then snapped loose and started rolling please let me know what can be wrong.
Correct me if I'm wrong, but at 02:12 you say that the rear planetary gearset has two ring gears. This being a Ravigneaux gearset, I believe it has only one effective ring gear, that being meshed with the long planet gears. The short planet gears mesh only with the long planet gears and the small sun gear.
My 6l80 4/5/6 feels like neutral shifts smooth 1/2/3 and even into 4 and down shifts but 4/5/6 feels like neutral. I have a pressure switch stuck open code. I don’t tow with it or hot rod it I was interstate driving when this happen..... ??? Definitely getting some heavy repair cost 2800 etc only just over 100,000 miles
hello i have an issue with my 6l80 that i have on my corvette
there is no reverse and it got stuck on third and got two codes popping up p0776 and p0700 , what do u think the issue is please help me on how to cure this
Nice
Thanks for watching
Excellent video. Not a fan of the 6l90e. Would rather just have a 4l80e with better shift programming. The 6l90e shifts erratically, sometimes shifting smooth, sometimes shifting slow, sometimes shifting to fast and harshly. Not upshifting when i want, downshifting when I don’t want it to etc. I have one in a Isuzu npr with the 6.0 vortec v8. I miss my old truck with the 4l80e. The 6l90e has very noticeable torque management or throttle reduction between shifts leaving all light or mid throttle shifts above the 1-2 feeling like a pause then shift then clutch sort of feeling. In the box truck it won’t upshift until about 2200 rpm which is annoying and if the rpm wants to go below 1500rpm it downshifts. That’s great and all if I’m towing a large amount but I’m simply hustling chips and sodas around town. When cruising at like 40 it should upshift to 6th to save gas, but it won’t it will hold 5th or even 4th and if I apply brake it will down shift and if I let of gas it will down shift. Basically it’s a pos. It wants to be a manual so bad but it can’t be. It’s a 6spd auto it should act like one. Plus it has an annoying torque converter judder in 2nd gear and the 4th gear isn’t even 1:1 it’s like 1.15:1 which sucks it robs power and isn’t deep enough to grab on a freeway speed down shift. It will catch 5th which is overdrive, than torque management will rob power in 5th. This trans is aids. When my boss bought me the new truck I was excited to try the 6speed but 4000miles later I’m disappointed. Surely it can’t be saving gas holding rpm all the time like that. And I’m not sure it will last very long. It might be a rock solid trans but it sure shifts like shit. I would rather have a new redesign of the 4l80e that didn’t upshift to 3rd at 20mph and would actually lock the converter in 2, and 3rd gear. As long as it lasts a while I’m happy but I have a gut feeling it might not. It’s just annoying because Isuzu only lets me select gears 1,2,4, and 6 and the programming on the 4 position is for heavy hauling it won’t upshift until 3000rpm even with the lightest throttle angle (and I mean like 10-15 percent, which is required to get the truck moving)
Sigh...if it ever breaks I’m sneaking into the lot and putting a 6speed manual or a 4l80e with a shift kit in it. They probably will never know since they aren’t really car people.
Oh yeah all this is normal btw for the 6l90e. Only thing it does right is full throttle upshift which I don’t like to do because I don’t like to go around flooring a company vehicle like that. It needs a redesign or a scrap imo. The new 6.0 seems like a solid piece but Gm should let the driver better control the truck. I don’t need it downshifting all the time like a boy racer when in traffic like that.
I am sorry to hear of your transmission issues. Thanks for your feedback!
The 6L80 can handle 430 lb*ft of torque, the 6L90 is more, but I don't have a specification on it.
Can you advise which transmission would best suit this application, mounting it to the engine??
The 6L80 or 6L90 from a GMC or Chevrolet truck would be great. The 6L90 is more heavy duty
how is the NEW GM 10 speed ???
any issues or problems ?
i heard the 8 speed has issues
HAS THE ORIGINAL ONE.CAN U SHOW A VIDEO ABOUT THE GOVERNOR, PLEASE
how much torque can this reliably handle?
Will a 2009 G8 LS2 Pontiac automatic transmission work on my 2007 Corvette engine!??
Yes, I think so
I have a 2008 equinox sport with 6 speed auto with manual shift mode. When I put the lever in manual mode , will not work, what is wrong?
+Kaylee Mortensen You have to manually upshift and downshift in manual mode. Many vehicles have a plus and minus symbol next to the shifter lever. This causes an upshift when you tilt the lever towards the plus symbol and downshifts when you tile the lever to the minus symbol. Other vehicles have little paddles on the steering wheel that do the same thing. If yours does not work properly, there may be a wiring problem that needs to be diagnosed by a professional. Thanks for watching.
When the 4-5-6 clutch is applied it drives the output carrier at turbine shaft speed,you can see this at 18:25,you have one solid shaft to the bottom of the output carrier.At around 19:25 you misspoke and said it drove the carrier through input planetary at 1.5:1. The turbine shaft is driving the carrier at turbine shaft speed through 4-5-6 clutch and the 1-2-3-4 clutch is driving rear sun gear through input planetary and 1-2-3-4 clutch hub at 1.5:1. The result is output internal gear is driven at 1.152:1
Thanks for the correction!
@@WeberAuto Thank you. Your minor mistake made me really think about what was going on there and get it straight in my head,so now I know exactly how that interaction works.So I did learn because of you! I recommend your videos to all the guys in the shop! ( Chicagoland Chevy Dealership)
@@johnhnetkovsky8917 Thank you
can you demonstrate the generation 2 6t40?
does GM provide cores for you to teach with? Help out the training of their possible future techs?
+MrToolsinbox Hi, at times they supply cores for our GM ASEP program. The rest of the time we try salvage yards.
Will I have to change out the flywheel or will it work with the 6L80??
LS engines came with 6L80 in trucks. Just makes sure you have the correct flywheel for the year of transmission you have.
How is this transmission controlled? I heard the controller is integrated into the valve body. What is needed for it to work? How is it interfaced with the ecm? Great video!! I subbed!!! Had to! To fill my thirst for knowledge!!!! Thanks for the information, and time and effort put into this video,,_
There is a transmission control module TCM attached to the valve body. It needs power ground, and CAN data. Thank you
@@WeberAuto do you know where I can find the signals its looking for?
@@jamest.5001 Wiring diagrams in a GM Service information subscription. See: www.acdelcotds.com/subscriptions
thank you...
Somehow it seem that this transmission is less smooth on the 2-3 shift than any other. I can shift 2-3 quite well unless you ease the throttle during the shift. The other shifts work better if you are letting off the throttle.
Will need a bell housing foe the 6L80E to mount on the 2007 corvette engine, which one do I use??
Any 2007-2016 Chevrolet or GMC truck 6L80E bell housing. They also came in 2007 and above Camaros
Is the truck 6L80E larger than the car one??
I do not think so
No but has a different rear for 4x4 to bold on the transfer case!
is this a Good Transmission ?
just got a used Tahoe with this Engine ? mated to a 5.3L
It is a good transmission. They are notorious for weak torque converters. My wife's is in the shop getting rebuilt now, but it lasted 160k with the original fluid. My advice is to use tow/haul mode when towing, or in steep terrain. Never tow in overdrive. Also, change the fluid and filter every 50k miles, despite what the owners manual may say. It will save you $$$ down the road. Her rebuild is $3k plus tax.
@@ericpigg2689 thanks for Reply Eric
my Mileage is 33,000 km
seen you tube Videos abit tricky to remove the PAN
Unplug an electrical connection from these two transmissions,to the dealer to have them programed all over again with the Tech 2.Wipes out the info from the computer.Jasper does it on site when they reman them,they have a $100,000.00 test stand they program these on after you call them in to give them the whole vin.
Regeneau planetary gear-set.
what is the differant with a 07 and a 09 trans [ with the 07 being a one year trans] 6l80
The 6L80 is still available today in some GM models. The 6L90 was used in higher torque applications like the Camaro, Corvette, HD Trucks.
OK, I see. Then it's more like a Simpson with a set of reversing idler's on one set of planets?
I HAVE A 63 CADDILAC WHONT SHIFT, ONLY FIRST GEAR, WHAT COULD BE THE PROBLEM?
Which transmission does it have. If it is the original one, it could be a Governor issue.
+WeberAuto CAN U SHOW A VIDEO ABOUT THE GOVERNOR PLEASE
+WeberAuto It has the original transmission,
Make sure your fluid level is correct first. I do not have a video about a governor yet. It is a part that rotates with the transmission output shaft that controls a fluid pressure that increases with vehicle speed. This fluid pressure causes the transmission to upshift. Many transmissions have a governor pressure port where you can connect a pressure gauge and see if it increases as it should. The governor is an internal part. There are other things that can also cause the transmission to not upshift, but the Governor is the main part responsible for upshifts. Best wishes.
+WeberAuto CAR WAS PARK FOR YEARS, OWNER SAID IT WAS SHIFTING BEFORE, I DID CHANGE THE OIL, I DIDN'T FOUND PIECES OF METAL.
6L90 is 625 plus.
Hi
Hello, thank you watching
compare 8L90 to ZF8HP95
The big difficulty is people cannot show the gear train schematic, and talk about its working principle. verbal talking of complex mechanical systems is messy.
22:35
Have 1 a day blow a pump.
They couldn't even get the overdrive 4 speed autos right. I'll stick to the proven old school 3 speeds. These 6, 9, 10 speeds are stupid!
Thanks for your feedback
Bad gearbox, unreliable. I have it in my 2011 camaro SS, my mileage is 106.000 miles and gearbox is already kicking. The solenoids do not change, GM wants to make more money by selling the valve body assembly. All rubber bands are torn, you need to change a set of rubber bands. This gearbox does not like high speeds above 100 mph, since the oil pump is not designed for this. Why do you put such a gearbox in a muscle car if it does not fit a 6.2 liter engine?! I am very disappointed in GM
too long~
These are both GARBAGE