What Speedometer Gear is Right For You? -EricTheCarGuy
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- เผยแพร่เมื่อ 26 พ.ย. 2015
- Paul Cangialosi of 5Speeds.com stopped by the shop to help me rebuild the T5 transmission in my 1979 Ford Fairmont Project. During the build, we needed to work out what speedometer gear I should use. In this video Paul covers how to determine how many teeth are on a speedo gear, and what gear is right for your application.
So if you're looking to figure out what speedometer gears you're going to need for your next build, look no further.
Camera: Brian Kast
Thanks for watching!
The best place for answers to your automotive questions: www.ericthecarguy.com
Visit www.5speeds.com for more helpful information from Paul Cangialosi.
Pauls book on rebuilding manual transmissions: www.5speeds.com/cart/index.php...
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Paul's TH-cam Channel: / gearworldtv
Speedo Gear Calculator: www.5speeds.com/calculators/Sp...
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Due to factors beyond the control of EricTheCarGuy, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. EricTheCarGuy assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. EricTheCarGuy recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of EricTheCarGuy, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not EricTheCarGuy. - ยานยนต์และพาหนะ
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Hey Eric. I just wanted to thank you for all your videos. Besides being extremely helpful they are also entertaining to watch. You're an amazing person for sharing your knowledge and experiences.
Came back to these videos a couple years later lol, thanks again guys, that gear calculator seriously helped with my oddball project.
Very helpful guys! I have a 65 Fairlane I just got done a massive 17 year project on modernizing and restoring it, swapped the highway gears for 3.55s with a locker. Problem now is when I'm doing 70 on the speedometer I'm actually only doing 55. This video and his website will def help once I figure out how many teeth on my drive gear.
Eric definitely enjoying this build series mixed in between the repair videos (fixing it forward). Extremely informative
+Nik Trp If i had Fox Body I would be in seven heaven. Even though we have internet era, the well informed people are still from "old days" when You had to know all your shit from hands-on experience. When I was searching how to stuff auto-clutch in my wr250x it took two days just to determine if it's possible to custom fit it in. 'Murica has it going with bolt-on :)
Eric and Paul THANK YOU THANK YOU THANK YOU !!!!!! This has been driving me crazy on a 1991 f 250 that had the trans replaced with one from a older 1988 E4od trans that was repinned for it . and has been chewing speedo gears . got it all set now :) ty again information here that was priceless !!
Super helpful, thanks. That’s the best calculator I’ve seen online!
Staying up late paid off! First time ever first to a ETCG post!
Awesome info, thanks!
Great tips. I usually just use a GPS then note how much off my speedo is off and go by that, but it would be nice to have it actually read accurately sometimes.
Great video
I am loving your 60fps video eric!
+William Hendarta I thought something was different with his recent videos but I couldn't put my finger on it!
You can also play around with tire size. On my one car, they stopped making the size I wanted in the tire I wanted 205/60/15 so I got 195/65/15. Less than a quarter inch taller but it brought the speedometer from 3mph optimistic at 70mph to about 1/2 a mile an hour optimistic which is much better. The 195mm also fits the rims a lot better too, the rims aren't really wide enough for 205 IMO.
Awesome!
Are we going to watch Eric the Car Guy in 360 degree in the future? The new 360 degree virtual reality camera
TWO GREATS. GREETINGS TO Paul Cangialosi. I follow his channel & Web. Great Surprise to see them in the same Video!
+José Eduardo Pacheco González Thanks!
GearBoxVideo THANKS TO YOU. & Your very interesting INFO.
The three interruptions in 20 seconds were a little annoying but great info. Can't wait to see the rebuild video!
GREAT I learned something today. now its time to go working on my 80 z28 lets see if that works...
AMC used a lot of Ford parts. I've been told that their white 23-tooth gear fits on an AMX with a T10 4-speed, 3.54 posi and E70-14 tires
Eric, hi 👋.
I enjoy your video’s.👍🏽.
Ok, I have a 70 Chevy Impala Custom.
350 engine w 300 turbo fire. It originally came with 15” Rally rims. But, I replaced them with 14”x7” Dayton rims. What gear should I use on my transmission. If you know by chance.!yes it’s a Low Rider. Rey Zapata. San Fernando, California.
We performed a toothcount clockwise around a redneck campfire, 7 adults, 37 teeth in total
How do i know what range of driven gears the current drive gear will work with? Is there a chart? I'm not changing my drive gear if I don't have to.
The places the gear teeth end are known as "Starts" - this can apply to threads or worm gears in this case. The more "starts" on a thread the faster a nut will move down the bolt per turn. Normal fasteners are single start threads.
Water bottles threads have many starts so the cap comes off in one quick twist.
+LucasJ1540 That's a great analogy!
Hi Paul purchased your steel countershaft plate a few years back, thank you, my speedo cable seized up on my T5Z, the drive gear teeth broke and the 7 tooth yellow main gear is missing off the shaft, I now have a tapping sound when the car is ticking over that goes away when I depress the clutch, I have to drive the car 10 miles to tear it apart, do you think the gear has just slipped down the shaft ? if so what would it be tapping against ? any ideas please
Thank you
Can you help i need to find out what gear kit i need for 1984 chevy s10 2.8 v6?
I have 15 drive gear and I need a 39 driven gear, I have been told on my 1986 C10 with a 700R4 should have a speed reducer on it, not sure about that. My speedometer is off by at least 15 miles (higher) do I need a smaller driven gear?
I changed out the speedometer in my '75 Dodge pickup from an 80mph to a 100mph one. My speedometer registers around 5mph faster than my actual speed. (this is at around 35mph, i dont know if it gets worse at higher speed or not.) Would that require a gear change?
If I take out the cable gear on an 88 Ford, can I count the drive gear teeth with it in the transmission.
more with paul!
+Superdude Superdude Thanks!
Could you please tell me I have a 700r4 with a 45 driven gear and a 17 drive gear the speedo is off 15 MPH if Im doing 25 MPH the speedo reads 40 and the faster a go the more off it is I maximized the driven gear is 45 I need to know what drive gear I need ,I now every tooth on driven gear gives 2 1/2 MPH Need to know what a extra tooth would give on drive gear
I have a 700 r4 transmission in my car. I have 308 gears now, if I change the speedometer gear now will it be accurate when I switch to 373 gears?
I have a 31x10.50r15 ratio is 241 I was just needing to know what speedometer gear I need
hey eric, whats your amazon affiliation code/link? i dont mind using that for you
Hello, I have a serious problem with my vehicle. I own Mahindra thar crde 4x4 2013 model. Very often I observe the speedometer gear is getting damaged (especially when I hit a pothole). This is my 5th time I am replacing the gear. It’s 17 teeth model. I really don’t understand the root cause. I would be very grateful to you if you have an answer for this. Thanks in advance
very good. Yes, very good.
Which one is the right one? Well, obviously the prettiest one.
can you do a video on oil pump removal in car
Eric, show us how to remove the pressed on steel drive gear.
do you know DAIHATSU CHARADE speedo driven gear tooth size
Eric, I have 1969 Chevelle SS with 411 posi track rear end. The tire size on the rear is P-275 60R15. What size spedo gear do I need, thanks for all your knowledge and experience.........Ron
Go to GMPartsWiKi dot com. Look up the parts books for your 1969 A-Body and look at the speedometer gear tables.
You need to know the three digit transmission-model RPO, year, model, tire-size, and axle-ratio.
If you're using a TH700R4 or some other non 1969 transmission you'll need to look up the transmission RPO for the donor model year and go to the table in the parts books for a plausible donor vehicle that used that transmission.
I probably shouldn't have consumed "the herb" before watching this... I now think you two are smarter than any professional politician I've ever met! Good discussion, Gents.
Its bc they are.
Eric how tall are u like 6'1 ?
I kinda hate these 2 videos where this other transmission guy appears. I feel that whenever Eric tries to explain to the public what the guy is saying/meaning, he rushes to say what he has to say because the transmission guy keeps talking over Eric's speech.
Eric, simply re-do the video without this Cangaroosi (or whatever it is spelled) guy, and explain the info in your usual way. He has a terrible attitude. I wonder why you simply didn't edit him out: the guy stops talking so you can speak, you are in the middle of a sentence and the guy resumes talking giving zero f***s. In both videos he does the same. What a disrespectful guy.
+VochoTalacha I agree this guy is rude 0:40 2:40 2:59
+Drunken Ira Hayes No, not at all.
They are explaining something, not having a discussion. Unfortunately, the transmission guy clearly seems he hasn't been on such a didactic video before, and maybe he was just acting naturally and he didn't mean to be rude.
I know nobody's perfect and that I can't expect other to think like me or anyone else, but, c'mon... whenever you are explaining or talking along with somebody else, you know you have to take turns. It's something one learns from you parents or at school, unless you didn't give a dang about that.
Every human head is a different world, but hey, there are a few things we all converge into, such as morals and manners.
+VochoTalacha That was a marvelous reply! I don't 100% agree with what you're saying, but I do see where you're coming from however I replied simply to compliment you for handling Drunken Ira Hayes comment that well. Have a good day.
+VochoTalacha I disagree, hes the transmission expert and thats what the video is about
CR2504life I've got no objection in regard to the fact that the man is a transmission expert.
Some people just don't get it. Eric, I believe, Is taking what he has and making it work. That is the truest form of hot rodding. I'm sure if Eric wanted to he could go all out. He could put in some form of computerized crap. And then go digital with the speedo if he wanted. But instead he has opted to do this the old school way. By taking a combo of parts and making them work. Again, That is true hot rodding. As far as the guy goes that has taken time out of his day to fly out to help Eric with his trans,
Why should anyone give two shyts on a hot a hot rock about his attitude? This is Eric's video. If he is OK with the guy, that's all that matters. I'm sure the guy knows what he is doing. Or Eric wouldn't have bothered with him. Now, Where is the whole rebuild video? I hope to see a complete video of this trans rebuild.
+GALAXIE 500XL Thanks for your comments. I'm doing the edits on the rebuild video now. Hoping to air them the first week of January.
+GALAXIE 500XL Thanks for this comment. Sometimes a small majority of people loose sight that they are getting great video production and information for free. The reason I decided to do a rebuild video with Eric is because he has a way better environment than my shop, a great camera man and awesome editing. The idea was to put out one of the best rebuilding videos for a T5 transmission. I know its going to be great. I was really surprised to see people poking fun about me being Italian. I'm not used to that mindset. I work with race teams and people who build pro-touring cars on a daily basis and in 34 years have never been subjected to the kind of disrespect I have seen from some of these people.
+GearBoxVideo What it is, these people who are shooting from the lip are actually people who have no idea what they are doing. They like to run their mouth and hide in front of their keyboards. In other words, Trolls. The more you know about what you are doing, the more trolls you will attract. Eric doesn't seem to get a lot of trolls on his channel. But sometimes he does get them. The best thing to do is forget about it. I think I know what Eric is doing. Because I've done it myself. The cheapest way of doing something. But still doing it right and having a good outcome. That's also true hot rodding. A lot of folks don't have mega bucks to throw at a car. I'm reasonably sure Eric doesn't. The way he is doing this is the way a lot of people would do it. The speedo isn't what will spank the guy next to you when the tree lights come down.
GearBoxVideo most of these assholes are just keyboard warriors and grammar Nazi's so take it in stride that's all
Yup. Need to figure this out one day. I have over sized tires on my F-150. The speedometer reads 7 kph slower than I am actually going.
WOW❤
So i have a 77 chevy c10.. 3.08 rear end th350 transmision that im not 100% sure but pretty sure isnt the original one ..the speedometer doesnt work because gear is wrong.. Im about to pull it out this week amd see what tooth count is on the output shaft..but my question is how does it determine which ome you need if it isnt the original one? Maybe I'm missing something here..does the drove gear on the outout shaft not matter which one it counts as to what speedo gear we hook up to that to make it work or do i have this wrong? 😬 sorry 1st timer here trying figure this out.
Each drive gear has a range depending what rear gears you have, Ex. A black drive gear might work wit 2.25 - 3.55 rears, then you fine tune it with the different driven gears the one that go on the spedo cable.
is this why my mustang messed up,it shifts way too fast and it gets stuck and wont pass about 20 and its an automatic
If have a c4 transmission with a 7 tooth drive gear, 3.73 rear, and 245/40/18 rear tires, what speedo gear do I need?
@@Olds_Pwr Awesome! Thank you so much for replying. I appreciate it.
I have a 1994 Pontiac Trans Am. I believe had 273 gears put in. I need to know color gear, is set for this change.
Can you give me any info, regarding my issue?
the speedometer is reading 30 over correct speed.. The tires are not over sized. Just rear gear change from original to 273 gears.
the speedometer is reading 30 over correct speed.. The tires are not over sized. Just rear gear change from original to 273 gears.
You can indeed count the gear teeth if not from the east coast
What is final drive
Going by some of the comments on this video some people have never worked beside experts or boffins. sometimes they are so enthralled with their specific field of work manners go by the wayside, I don't see it as an issue the man is giving you a lifetime of work and advice shrunk down to two videos for free, try walking into your dealership and asking so called technician anything and you will get a blank look as modern mechanics are computer techs and can't fix practically nothing glorified fitters of new parts.
Much thanks.
@@GearBoxVideo definitely going to use your video when I put a 5 speed in my mustang.
Can anyone help me with a question I have. I recently purchased a 2000 Chevy Blazer with 200000 miles on it . The guy told me he has ran Mobil 1 synthetic in it since he bought it brand new. The car does have a small oil leak, would switching back to a thicker conventional motor oil fill in the space and possibly minimize my oil leak or should I just stick with the Mobil 1 synthetic? I am extremely good about changing oil and am wondering if conventional will help keep oil leaks at bay?
no. it will not fix an oil leak.
Mobil 1 isn't a good oil to begin with (sheering issues are common), but switching from it to a heavier oil wouldn't help with a leak.
Heavier helps with slight burning, changing brands helps with burning (Mobil 1 is well known for burning issues from sheering), but not leaks.
On David Kees site it says black one is 7 tooth.
I think, according to what i graphically saw, the tooth count of the two pieces were equal. Just wondering if im right or not lol nice video quality by the way
+Bryan_NFS Nope. The drive gears have different tooth counts. Looking at the face of the gear you won't see the difference.
The factory uses different colors for identification of different tooth counts. Most people will not know the color codes and the colors do fade over time. So laying them on their side is the best way to count the teeth where they come to an end. The yellow gear is 7 teeth and the other light blue gear was 8 teeth.
So dumb question, 78 F150 RWD. Id plugin rear wheel sizes right? Cause fronts are low profile, rears are not.
+WannaBeDj100 You would use the tire size of the drive axle. Unless you are working on some of the oddball vehicles like an air cooled VW, those get the speedo drive from the front tire.
***** Thank you, good sir! Thats what I would have ass-u-me"ed". but like the saying goes.
you are correct...off the rears
Thanks!
Does the trans have to be dropped again to change out the speedometer gear inside?
Some automatics its possible to remove the tail to change the drive gear. With a T5 and most manuals that is not possible.
@@GearBoxVideo well that sucks...I wish I had seen this video before I swapped out the 3 speed with a toploader and installed a new rear axle with lower gears. Maybe I can peak in the hole to determine what color the drive gear is and try to go from there.
@@bobbya9949 Toploader you can drop the driveshaft and remove the tail to change the drive gear.
It’s for 700r4 Automatic transmission
Well like I tell all we can always meet from behind the screen
Wait what, they both have 8!
just slap a GPS unit on your dash DONE! accurate speedometer. Great info I have an old nissan 5 speed that I want to rebuild just for fun its got bad syncros
+bmxguy08 takes like 5 minutes to lock on sattelites tho
+Re On a TomTom or Chinese knockoff, perhaps. I've always used Garmin Nuvi devices and, unless I was in a parking garage, the satellites are locked on by the time I start the GPS and enter my destination.
1k rpm / mile on the speedometer?? That can't be right?
My head hurts
1000 RPM's per mile with U.S. cars made after 1965.
I uploaded a video of a issue I got could you come over and check it out I need some help
Or get a gps speedo for a hundred bucks
This needs context to make it clear why some vehicles have speedo gears, which don't, and why.
People still use cable based speedometers? Wow...
well they do. because most custom builds don't have computer chips. modern day cars can be be programmed via by obdii port.
+FrozenHaxor They aren't working on brand new cars. The mustang is a late 80's or so.
+yellowbusguy Well, I suppose that if someone is into that sort of stuff, they might find this video helpful, that's kinda beyond this channel but okay. Where the fuck did that Paul Somethingrather come from anyway, kinda video topic from ass IMHO.
+yellowbusguy 1982
+FrozenHaxor this is a classic car
If it doesn´t tell you the actual precentage of error you get with that set of gears then the calculator crap.