What Speedometer Gear is Right For You? -EricTheCarGuy

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: http://www.ericthecarguy.com

Visit http://www.5speeds.com for more helpful information from Paul Cangialosi.

Pauls book on rebuilding manual transmissions: http://www.5speeds.com/cart/index.php?route=product/product&product_id=33

Electronic version of Paul’s book: https://books.google.com/books/about/How_to_Rebuild_and_Modify_High_Performan.html?id=OexeE4mTsZYC

Paul’s YouTube Channel: https://www.youtube.com/user/GearWorldTV

Speedo Gear Calculator: http://www.5speeds.com/calculators/SpeedoCalc.html

Related videos

How a Manual Transmission Works: https://www.youtube.com/watch?v=d9clD8ZL8xA

A Quick Easy Way To Determine Axle Ratio: https://www.youtube.com/watch?v=xY1mcbotJ9A

A Brief History of the T-5 Transmission: https://www.youtube.com/watch?v=oVPAeTnRdA0

T-5 Transmission Rebuild with Paul Cangialosi: Link posted when video becomes available.

Discussion about this video: http://www.ericthecarguy.com/kunena/18-The-EricTheCarGuy-Video-Forum/61099-what-speedometer-gear-is-right-for-you#152939

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Stay Dirty


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.


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25 thoughts on “What Speedometer Gear is Right For You? -EricTheCarGuy

  1. Came back to these videos a couple years later lol, thanks again guys, that gear calculator seriously helped with my oddball project.

  2. 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?

  3. 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.

  4. 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

  5. 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

  6. 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.

  7. Hello, I have a serious problem with my vehicle. I own Mahindra thar crde 4×4 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

  8. 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?

  9. 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

  10. 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.

  11. 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.

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