Rear End ratio?

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Aug 17, 2008 | 12:58 PM

pipe

Thread Starter

Drifting

Joined: Jan 2003

Posts: 1,894

Likes: 3

From: Reading PA.

Rear End ratio?

Is there a way to tell what rear ratio I have in my 88 by checking under the console lid with the options and code #s? Looking at my Black Book I think the car has the Z51 or Z01 Package in it with the heavy duty suspension and quick steering box in it. What would the option codes be for the different ratio's? THANKS FOR ANY HELP Pipe

Aug 17, 2008 | 01:05 PM

Mekanic

Melting Slicks

Joined: Oct 2006

Posts: 2,314

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From: In a van down by the river! Florida

G92 is the performance ratio for an auto

Last edited by Mekanic; Aug 17, 2008 at 01:07 PM.

Aug 17, 2008 | 01:18 PM

pipe

Thread Starter

Drifting

Joined: Jan 2003

Posts: 1,894

Likes: 3

From: Reading PA.

Thanks for the info I just looked at the Black Book again and saw that G92 is the 3:07 ratio. I wrote down all the RPO's when I was down the Garage mmm has a G44 whatever that is. THANKS Mekanic

Pipe

Aug 17, 2008 | 01:22 PM

pmihaltian

Slingshot

Joined: Dec 2001

Posts: 3,817

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From: Charlotte NC

G44 = 3.07:1 rear axle ratio. This is the Performance Ratio for your year.

Aug 17, 2008 | 01:29 PM

CFI-EFI

Race Director

Joined: Sep 2000

Posts: 17,298

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From: The Top of Utah

Z01 is an appearance package for 1988. Z07 is an economy package for 1976-1985 trucks. The Z51 is a performance and handling package, that includes several items, but not a rear axle ratio. Any "Z" RPO is a package of some sort, never a gear ratio. Almost all axle ratios carry a "G" designation. However, not all "G"s are ratios. G80 means positraction, G87 means 8 1/2" ring gear, G92 means performance ratio. But G92 is meaningless because the "performance ratio" varies from year to year and car to car. Look for an RPO with a "G" designation, other than the above.

RACE ON!!!

Aug 17, 2008 | 03:45 PM

vader86

Team Owner

Joined: Sep 2001

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From: Athens AL

C7 of the Year - Unmodified Finalist 2021

C4 of Year Finalist (performance mods) 2019

G44=3.07, so you got the best available for an automatic.

G92 is meaningless.

Aug 17, 2008 | 03:59 PM

94z07fx3

Race Director

Joined: Dec 2006

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If you didn't buy it new, then the only way to know for sure is to count the propeller shaft turns vs the half shaft turns. New gearing is a popular mod. 2¢