verifing rear gear ratio on 4thgen rear

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Apr 5, 2006 | 09:32 PM

kairles

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Joined: Nov 2003

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From: Antelope, CA

Car: 89 IrocZ/17 LS 1LE

Engine: 383/LGX

Transmission: 400/TR-3160

Axle/Gears: 3.08/3.27

verifing rear gear ratio on 4thgen rear

how can I verify the gear ratio with out pulling the cover. I know on thirdgens they have a code stamped on the axle tube. there is a bar code label with some numbers on it, will that tell me anything

Apr 6, 2006 | 03:46 AM

ede

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Joined: Aug 1999

Posts: 14,811

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From: Jackson County

pull the cover it's way easier and more accurate that looking around for the codes.

Apr 6, 2006 | 07:55 AM

DJP87Z28

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Joined: Mar 2003

Posts: 4,771

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From: Florida

Car: 1987 Black IROC-Z (SOLD)

Only three gear ratios on the 4th gen cars.
2:73 & 3:23 on Autos.
3:42 on Manual

Apr 6, 2006 | 08:21 AM

3.8TransAM

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Joined: Feb 2000

Posts: 7,015

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From: Schererville , IN

Car: 91 GTA, 91 Formula, 89 TTA

Engine: all 225+ RWHP

Transmission: all OD

Axle/Gears: Always the good ones

Pull the cover:

Count teeth on ring and divide by pinion
or:
Find the gear ration stamped on the ring gear(if its there) and divide.

Or mark a wheel stud and count how many times the yoke turns to complete one revolution of the wheel stud.

Ie 3 1/4 turns = 3:23

3.5 = 3:42

Less than 3 = 2:73

later
Jeremy