PROPER SPEEDO GEAR FOR 3:73 REAR END

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Mar 25, 2009 | 11:38 PM

Dean_GTA

Thread Starter

Junior Member

Joined: Jul 2007

Posts: 81

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Car: 1988 TA GTA

Engine: L98 Replaced w/ 350/330HP W/TPI

Transmission: Stock 700r4

Axle/Gears: stock 3:27

PROPER SPEEDO GEAR FOR 3:73 REAR END

Hi! Does anyone know which speedo gear is to be used for a 1988 Trans Am with 3:73 gears. The car has a 700r4 trans, and stock 245/50/16 tires. I know the gears are color coded, and it depends on the number of teeth. Any idea?

Mar 26, 2009 | 01:16 AM

Kevin91Z

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iTrader: (1)

Joined: Jul 1999

Posts: 10,950

Likes: 26

From: Orange, SoCal

Car: 1990 Pontiac Trans Am

Engine: 355 TPI siamesed runners

Transmission: Tremec T56

Axle/Gears: 12-Bolt 3.73

Re: PROPER SPEEDO GEAR FOR 3:73 REAR END

15 tooth drive and 45 tooth driven.

Mar 26, 2009 | 06:13 AM

Atilla the Fun

On Probation

Joined: Oct 2008

Posts: 6,319

Likes: 19

From: Northern Utah

Car: seeking '90.5-'92 'bird hardtop

Engine: several

Transmission: none

Axle/Gears: none

Re: PROPER SPEEDO GEAR FOR 3:73 REAR END

Actually, you need a 44 tooth driven. The drive gear is gray, part number 8642620, and the driven gear is Dark Gray, part number 9780470 for non-digital dash, or part number 25513051 for digital dash.