Correcting Speedometer

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Oct 22, 2007 | 10:56 AM

splinter_cell

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Joined: Apr 2003

Posts: 745

From: FL

Correcting Speedometer

My dad is going to get some 4th gen rims for his 92 Z. What will he need to do to correct the speedometer?

Oct 22, 2007 | 03:50 PM

1987IROC350

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Joined: Nov 2005

Posts: 700

From: Center Point, Texas

There is a gear in the transmission that will have to be changed if its a Z28. If it is a 3rd gen Trans Am it could have an electric speedometer.

Oct 22, 2007 | 11:03 PM

splinter_cell

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From: FL

Yeah it's a Z28 and he has an electronic speedometer.

Oct 23, 2007 | 06:26 AM

Z28SORR

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Joined: Jul 2002

Posts: 3,768

From: Friendswood, TX, USA

Don't necessarily have to change anything! It depends on the TIRE diameter. If you maintain the same overall dia., you don't need to change the gear.

Oct 23, 2007 | 02:29 PM

Marc 85Z28

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Joined: Dec 1999

Posts: 2,022

From: MD

You have to change the gears, even on the electric speedometer cars. Unless you plan to go to a 30+ inch tire or a 20 inch tire, a tire swap won't cut it.

http://www.thirdgen.org/calibrate-speedometer
http://www.thirdgen.org/speedogear

Oct 25, 2007 | 09:21 PM

Kevin91Z

3rd Gen Tech Moderator

Joined: Jun 1999

Posts: 780

From: Orange County, CA

Quote:

Originally Posted by Z28SORR

Don't necessarily have to change anything! It depends on the TIRE diameter. If you maintain the same overall dia., you don't need to change the gear.

This answer is correct.

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