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-   -   LB7: What Differential Do I Have (https://www.dieselplace.com/forum/76-speciality-forums/125-drivetrain-2001-2010/977418-what-differential-do-i-have.html)

Ermanno 07-22-2019 02:06 PM

What Differential Do I Have
 
2002 2500HD
Is there somewhere on truck or vin# that tells you which diff is in your truck.

davester 07-22-2019 03:17 PM

in your glove box, there should be a sticker with a whole bunch of 3 letter/digit codes, known as RPO codes. They list the options/features in your truck.


It'll have GT4 or GT5 (most likely GT4) indicating you have a 3.73 ratio.


If you want to know info about the rear axle itself (like if it's a 10.5" or 11" or whatever), the RPO codes don't have that level of detail, someone else should be able to tell you what it most likely is, or you can look at the bolt pattern of the diff cover and measure it to figure out what size it is.

jake111 07-22-2019 03:32 PM

...or maybe G80 for the "gov-lock" differential. Put that in the search and you can read arguments about this one for days!!

Rvn4me 07-23-2019 11:16 AM

11.5" 3.73:1 American Axle
RPO in glove box for type of differential should be G80
You have an Allison automatic or ZF6 Manual?
https://www.dieselplace.com/forum/76...-have-g80.html

Ermanno 07-23-2019 12:23 PM

Quote:

Originally Posted by Rvn4me (Post 9835792)
11.5" 3.73:1 American Axle
RPO in glove box for type of differential should be G80
You have an Allison automatic or ZF6 Manual?
https://www.dieselplace.com/forum/76...-have-g80.html
http://www.youtube.com/watch?v=ftyJvIO0DZ8

Ok I had a look in the glove box, there’s a GT4 and G80.
So is the 3:73 better for pulling heavy loads or a highway gear.
I have an Allison Automatic

jake111 07-23-2019 01:00 PM

The Duramax should have enough power with that rear end to pull your load up a telephone pole (if you could get traction, but might only be a small exaggeration :))

[added on edit] And that's already a tall gear for highway use, unless you want to go really fast all the time. Unless there's something wrong with the diff, it's best to leave it as it is.


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