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jrm8
12-08-2006, 06:33 PM
New guy here and have found the forum very interesting so I joined. I have a Grand National rear in a Malibu race car and the numbers on the axle are-

3TRG 111

I have looked at it 2 times and went to the codes in the site and can not find it listed.
It is not a 3TPG I am sure.

Got any info. Thanks
Jerry

monzaz
12-14-2006, 12:53 PM
Here is your info-
RPO |--------Axle Code--------|
Ring Gear Code Ratio Conventional Limited Slip
-------------------------------------------------------
7.5 G72 2.14 2AK 2BK (aluminum brake drums)
7.5 GH2 2.29 2AH 2BH
7.5 GU1 2.41 2AJ,2AZ 2BJ,2BZ
7.5 GM8 2.56 2AA 2BA
7.5 GU2 2.73 2AB,2AX 2BB,2BX
7.5 GU4 3.08 2AC,2AV 2BC,2BV
7.5 GU5 3.23 2AD 2BD
7.625 GT4 3.73 2TF 2TH (Monte Carlo SS)
8.5 GU6 3.42 3TP 3TJ (T-Type, GN Std.)
8.5 GT4 3.73 3TG ,3TE 3TR ,3TX (442, GN Opt.)

8.5 GU2 2.73 8YB 8YP (B-Body)
8.5 GU4 3.08 8YD 8YR (B-Body)
8.5 GU5 3.23 8YE 8YS (B-Body)

If you don't have the codes with you to indentify if it is an 8.5" or not,

Your code is in bold 3.73 GN rear performance opt. posi 3.73. Jim

turbofish38
12-14-2006, 05:43 PM
Thats the code for the 3.73 Posi. The code is 3TR. The G means it was assembled by Chevrolet Gear and Axle.

monzaz
12-15-2006, 11:55 AM
Oops looked at the wrong code in your question sorry well the info was there for you anyway...lol. I will correct it. :)

Keller
12-15-2006, 01:00 PM
3.73 was NEVER an option on the GN.

turbofish38
12-15-2006, 06:17 PM
Yep. That rear is out of the H/O-442.