need help identifing 4th gen rear end

Reply Subscribe

Thread Tools

Search this Thread

Sep 15, 2011 | 02:44 PM

gta007

Thread Starter

Member

Joined: May 2001

Posts: 153

Likes: 0

From: Middle TN USA

Car: 89 FORMULA 350 / 1991 RX7

Engine: 5.7 L98 / LT1

Transmission: 700R4 / 6 speed manual

Axle/Gears: 3.42 posi / 4.11 posi

need help identifing 4th gen rear end

ok guys i just got a rear end out of a car at the junk yard. the rpo sticker was long gone. I just could not it pass up. I need to determine the gear ratio. here are a few things that may or may not help. any help would be great thanks

1997 firebird 3800 engine
automatic trans
rear disc brakes

white sticker has a barcode, & 0625126

axle stamp on passenger side tube 7PS 6 2691
* The 6 could be the letter C

Sep 15, 2011 | 03:37 PM

JamesC

Moderator

iTrader: (5)

Joined: Aug 1999

Posts: 19,282

Likes: 103

From: Lawrence, KS

Car: Met. Silver 85 IROC/Sold

Engine: 350 HO Deluxe (350ci/330hp)

Transmission: T-5 (Non-WC)

Axle/Gears: Limited Slip 3.23's

Re: need help identifing 4th gen rear end

Quote:

Originally Posted by gta007

ok guys i just got a rear end out of a car at the junk yard. the rpo sticker was long gone. I just could not it pass up. I need to determine the gear ratio.

The surest way is to pop the cover and take a peek. The 10-Bolt FAQ will provide info about ring/pinion and tooth count.

JamesC

Sep 15, 2011 | 06:19 PM

jmd

Supreme Member

iTrader: (4)

Joined: Jul 2000

Posts: 6,521

Likes: 91

From: Aridzona

Car: `86 SS / `87 SS

Engine: L69 w/ TPI on top / 305 4bbl

Transmission: `95 T56 \ `88 200-4R

Re: need help identifing 4th gen rear end

7PS is an axle code; PS used to be 2.41 posi in the 1970s; I think they are now 3 digits & refer to groupings of RPOs collectively (such as a 2.73 disc rear w/ traction control and limited slip would have a different axle code than a 2.73 disc rear w/ limited slip)

6 should be the assembly plant; could it be G? (used to mean Detroit)

269th day of the year; 1st (day) shift