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Old 09-04-2013, 01:20 PM
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Default Re: 6.2L & 6l80 Power Uprades

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).
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"
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Last edited by guruerror : 09-04-2013 at 01:26 PM.
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