C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Speedo Gear Change II

Thread Tools
 
Search this Thread
 
Old Aug 3, 2009 | 09:43 PM
  #1  
pkazsr's Avatar
pkazsr
Thread Starter
Le Mans Master
 
Joined: Jul 2007
Posts: 5,356
Likes: 2
From: No HOA, New Hampshire
Cruise-In X Veteran
St. Jude Donor '09
Default Speedo Gear Change II

This should be easy, one bolt, pull out old , replace with new. After 21 years I guess it didn't want to give it up. I had the diff changed ( too difficult with only limited use of my left hand ) so now I have to change the speedo gear. Is there a trick to get the seal to break so I don't destroy the housing?
Reply
Old Aug 4, 2009 | 09:00 AM
  #2  
engle1147's Avatar
engle1147
Le Mans Master
Supporting Lifetime
 
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
Default

Originally Posted by pkazsr
This should be easy, one bolt, pull out old , replace with new. After 21 years I guess it didn't want to give it up. I had the diff changed ( too difficult with only limited use of my left hand ) so now I have to change the speedo gear. Is there a trick to get the seal to break so I don't destroy the housing?
They can be tight pull straight out....the seals are O rings. Take your time go slow ( I too have limited use of my "right" hand which has been smashed, crushed, cut).
If your looking to change the speedo gears to accomodate a new differential gear ratio you'll want to remove the transmission's tailshaft extension housing and change the gear on the tranny's output shaft as well.

Reply
Old Aug 4, 2009 | 08:07 PM
  #3  
pkazsr's Avatar
pkazsr
Thread Starter
Le Mans Master
 
Joined: Jul 2007
Posts: 5,356
Likes: 2
From: No HOA, New Hampshire
Cruise-In X Veteran
St. Jude Donor '09
Default

Originally Posted by engle1147
They can be tight pull straight out....the seals are O rings. Take your time go slow ( I too have limited use of my "right" hand which has been smashed, crushed, cut).
If your looking to change the speedo gears to accomodate a new differential gear ratio you'll want to remove the transmission's tailshaft extension housing and change the gear on the tranny's output shaft as well.

Is the change of the gear inside the tail shaft necessary for speed accuracy or just to match new to new?. This is a dirt driveway project and I don't want to spend too much time in the wet dirt under jackstands.
Reply
Old Aug 4, 2009 | 08:13 PM
  #4  
engle1147's Avatar
engle1147
Le Mans Master
Supporting Lifetime
 
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
Default

Originally Posted by pkazsr
Is the change of the gear inside the tail shaft necessary for speed accuracy or just to match new to new?. This is a dirt driveway project and I don't want to spend too much time in the wet dirt under jackstands.
I hear you..I've spent so much time on my back under my car I feel like a ***** sometimes. From what I've done the gears need to be changed in sets if you changing the rear gears..the speedo teeth need to match the new setup....and gears tend to wear together. Figure out what you need then make sure you install the new speedo gear where the old one was installed...other than that it is pretty straight forward. If the gears in the rear are going to be the same leave it alone.
Reply

Get notified of new replies

To Speedo Gear Change II





All times are GMT -4. The time now is 09:49 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