No Speedo again
Thread Starter
Burning Brakes
Joined: May 2011
Posts: 760
Likes: 104
From: Lewiston NY
2020 C8 of the Year Finalist - Modified
St. Jude Donor '12-'13-'14,'17, '20-'21
No Speedo again
Speedo didn’t work for 20 years on the 63 T-10. When we restored the car in 13 it took two attempts to get the gear right on the tailstock. I wasn’t doing the work, but apparently they couldn’t get the gear either to stay or in the right place.
it worked until last year then, dead again. It’s not the cable, not the nylon gear. Check all those. Has to be the tailpiece gear.
so, couple things come to mind:
- anything anyone can think of to try before pulling the trans?
- do I have to pull the motor and trans or can I just remove the trans?
it worked until last year then, dead again. It’s not the cable, not the nylon gear. Check all those. Has to be the tailpiece gear.
so, couple things come to mind:
- anything anyone can think of to try before pulling the trans?
- do I have to pull the motor and trans or can I just remove the trans?
Drifting
Joined: Aug 2004
Posts: 1,294
Likes: 295
From: Galveston & Belton Texas
If it is not the cable or the nylon gear but if you rotate the rear tires and the cable is in fact turning too, then I have to believe the problem is in your speedometer. If cable does not spin then good chance the metal speedo gear in the trans could be improperly located on its shaft. There is a measurement for how far the metal gear is pressed on the shaft (mid-plate to speedo gear). I don't know what the measurement is at the moment. If you look into the speedometer driven gear opening you should essentially see the metal speedo drive gear centered in the tailshaft opening. If the metal gear is the problem, the tailcase housing will have to come off for this repair. Pulling trans is all that is needed.
Last edited by tgtexas02; Nov 13, 2020 at 07:50 PM.
Thread Starter
Burning Brakes
Joined: May 2011
Posts: 760
Likes: 104
From: Lewiston NY
2020 C8 of the Year Finalist - Modified
St. Jude Donor '12-'13-'14,'17, '20-'21
If it is not the cable or the nylon gear but if you rotate the rear tires and the cable is in fact turning too, then I have to believe the problem is in your speedometer. If cable does not spin then good chance the metal speedo gear in the trans could be improperly located on its shaft. There is a measurement for how far the metal gear is pressed on the shaft (mid-plate to speedo gear). I don't know what the measurement is at the moment. If you look into the speedometer driven gear opening you should essentially see the metal speedo drive gear centered in the tailshaft opening. If the metal gear is the problem, the tailcase housing will have to come off for this repair. Pulling trans is all that is needed.
Thread Starter
Burning Brakes
Joined: May 2011
Posts: 760
Likes: 104
From: Lewiston NY
2020 C8 of the Year Finalist - Modified
St. Jude Donor '12-'13-'14,'17, '20-'21
I know.... but is is so annoying. With a near perfect 63 it just looks bad when I let other people drive it and the only thing wrong is no speedo! I also figure some day i will have to sell it and better to fix it now while I’m ‘young’.
Racer
Joined: Nov 2007
Posts: 333
Likes: 76
From: Massachusetts
Is it a replacement speedo cable? I bought one for my 65 last year and the tip that engages in the nylon gear was a bit short. Looked like it would work but didnt. Got another replacement and same deal. Just cleaned up the original and worked fine.
Team Owner
Joined: Sep 2003
Posts: 20,179
Likes: 673
From: Freedom is never more than one generation away from extinction.
St. Jude '03 thru '24
Drifting
Joined: Aug 2004
Posts: 1,294
Likes: 295
From: Galveston & Belton Texas
Are you planning to do this repair yourself or take to a very "qualified" T-10 trans expert?
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Melting Slicks
Joined: Sep 2013
Posts: 2,882
Likes: 2,178
From: Chicopee MA.
Thread Starter
Burning Brakes
Joined: May 2011
Posts: 760
Likes: 104
From: Lewiston NY
2020 C8 of the Year Finalist - Modified
St. Jude Donor '12-'13-'14,'17, '20-'21
I am not a T-10 expert but some things I think I have learned rebuilding my 58 trans. Possibly some of this info may help as you proceed. The very early (57-58) T-10's used a long steel speedometer driven gear instead of plastic. I learned this as my trans had a Muncie plastic gear which had been driven into the tailcase....the muncie plastic gear diameter was larger than the T-10 and shorter. Additionally, the internal metal shaft gear comes in two tooth counts (8 and 7 teeth). One is for 3:70 to 4:56 rear gears and the other for the higher gear sets. Bottomline here is that make sure you have the right plastic gear for your trans and know what metal gear will be right for your rear gears. As I mentioned before, find out what the mid-plate to metal speedo gear distance is too.
Are you planning to do this repair yourself or take to a very "qualified" T-10 trans expert?
Are you planning to do this repair yourself or take to a very "qualified" T-10 trans expert?
Drifting
Joined: Aug 2004
Posts: 1,294
Likes: 295
From: Galveston & Belton Texas
http://dandltransmission.com/
Last edited by tgtexas02; Nov 14, 2020 at 11:50 PM.