Quote:
Originally Posted by KT2T
I went looking for this information before MVR 155 posted the above and found this:
http://www.vibratesoftware.com/html_...MER/Hummer.htm
On that page, it lists 2003-2008 with 4.10 but that the 2008 optionally has 3.73. If this is the case, how would a second-hand owner of a 2008 validate what's already in the truck to determine what gearing to move to? I have also put 37x13.50 Interco SS M16 on my truck and have been thinking about re-gearing (thus my interest in this thread).
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You need to look up the RPO codes...I think they're listed on the sticker in the glove box or door jam...can't remember.
It'll look like this:
There's a site (
http://www.compnine.com/) that supposedly will decode your VIN and lookup your RPO codes automatically. Seems like it used to be free, but now they charge $5+, but I've never seen one of their reports, so I can't speak to how thorough it is. If you Google "compnine" though you'll find that a lot of people talk about using it...
You could also manually look up your RPO codes using this site,
http://www.c2e.info/rpocodes/gmrpocodes0through4.html, one of them is bound to reference the gearing option on your rig.
Hope this helps.
EDIT: It looks like it'll be an "G" or "H" code...like "GS3 : AXLE REAR, 3.73 RATIO" or "H05 : AXLE REAR, 3.73 RATIO"