Had gears in Differential changed today and now my Speedo reads wrong!!

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Oct 20, 2004 | 09:50 PM

grafx

Thread Starter

Supreme Member

Joined: Nov 2001

Posts: 1,160

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From: So. California

Car: 91 Camaro RS

Engine: 305 TBI

Transmission: Pro-Built Automatic/Vigilante 2800

Had gears in Differential changed today and now my Speedo reads wrong!!

Changed my gears from 2.73 to 3.73 and my MPH read really high while driving. Does the computer need to adjust to the gear swap or is something else the cause??

Oct 20, 2004 | 09:51 PM

IEatRice4dinner

Member

Joined: Apr 2003

Posts: 191

Likes: 0

From: Wisconsin

Car: IROC-Z

Engine: L98 350/ 5.7L

Transmission: 700R4

need new speedo gears

Oct 20, 2004 | 09:51 PM

92MaroRS

Senior Member

Joined: Nov 2003

Posts: 953

Likes: 0

From: Waterloo, Iowa

Car: 1992 Camaro RS 25th Aniversarry Edition

Engine: 305

Transmission: TH-700-R4

Axle/Gears: 10 bolt with 3.23's and SLP Posi.

Re: Had gears in Differential changed today and now my Speedo reads wrong!!

Quote:

Originally posted by grafx
Changed my gears from 2.73 to 3.73 and my MPH read really high while driving. Does the computer need to adjust to the gear swap or is something else the cause??

you need to change your speedo gears in your tranny! duh

Oct 20, 2004 | 09:58 PM

grafx

Thread Starter

Supreme Member

Joined: Nov 2001

Posts: 1,160

Likes: 0

From: So. California

Car: 91 Camaro RS

Engine: 305 TBI

Transmission: Pro-Built Automatic/Vigilante 2800

yeah that was a dumb question lol sorry wasn't thinking. How easy is it to replace the gears??

Oct 20, 2004 | 10:50 PM

Trickster

TGO Supporter

Joined: Sep 2003

Posts: 6,127

Likes: 11

From: conway, s.c.

Car: 1989 Iroc-Z

Engine: 5.7L TPI

Transmission: 700R4

If you have the MD8 700R4 transmission you will need the gray (15) drive gear and the blue (45) speedo gear. You will also need to replace your tires with one of the following sizes for the speedo to be accurate.

P195/75R14

P205/70R14

P215/65R15.