C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
Sponsored by:
Sponsored by:

1981 th350 speedo gears

Thread Tools
 
Search this Thread
 
Old Jun 7, 2012 | 03:59 AM
  #1  
cyclops1032's Avatar
cyclops1032
Thread Starter
Instructor
 
Joined: Jul 2011
Posts: 136
Likes: 0
From: Colorado City Texas
Default 1981 th350 speedo gears

My 81 was originally a 4 speed and the previous owner converted it to an automatic. It presently has a th350C in it but I plan to replace it with a regular th350. The speedo is way off and I need to know what gears need to be in it to correct the speedo. Anyone know the colors or number of teeth I need or know where I can find a gear calculator? As far as I know the differential is the factory 4 speed.
Reply
Old Jun 7, 2012 | 02:36 PM
  #2  
iokepakai's Avatar
iokepakai
Burning Brakes
15 Year Member
Conversation Starter
All Eyes On Me
Top Answer: 1
 
Joined: Apr 2007
Posts: 1,039
Likes: 62
From: Kona Hawaii
Default

Try this link http://www.transmissioncenter.net/sp...____va.htm#350 Don't forget to factor in your tire size when selecting a speedo gear.
While your at it look into changing the gear housing bullet.They tend to leak after all these years.Changed mine and now no more leaks....Aloha's
Reply
Old Jun 7, 2012 | 05:25 PM
  #3  
cyclops1032's Avatar
cyclops1032
Thread Starter
Instructor
 
Joined: Jul 2011
Posts: 136
Likes: 0
From: Colorado City Texas
Default

Originally Posted by iokepakai
Try this link http://www.transmissioncenter.net/sp...____va.htm#350 Don't forget to factor in your tire size when selecting a speedo gear.
While your at it look into changing the gear housing bullet.They tend to leak after all these years.Changed mine and now no more leaks....Aloha's
I checked the site out and I need to know either the drive gear size to find the driven gear size or the driven gear size to find the drive gear size. I don't know either size. I need to know what came in the 81 so I can replace both gears.
Reply
Old Jun 7, 2012 | 05:52 PM
  #4  
DRIVESHAFT's Avatar
DRIVESHAFT
Drifting
20 Year Member
 
Joined: Aug 2005
Posts: 1,682
Likes: 3
From: League City TX
Default

From the Wilcox site

http://willcoxcorvette.com/instructi...gear_chart.jpg
Reply
Old Jun 7, 2012 | 08:19 PM
  #5  
cyclops1032's Avatar
cyclops1032
Thread Starter
Instructor
 
Joined: Jul 2011
Posts: 136
Likes: 0
From: Colorado City Texas
Default

Originally Posted by DRIVESHAFT
Thank you! That is exactly what I was looking for.
Reply

Get notified of new replies

To 1981 th350 speedo gears





All times are GMT -4. The time now is 03:40 AM.

story-0
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-1
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-2
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-3
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-4
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-5
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-6
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-7
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-8
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-9
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE