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View Full Version : G80 gu6?!?!?!?


Athiel0
09-04-2009, 11:32 AM
Supposedly my 2000 GMC Sonoma 2WD 4.3ltr. has a G80 option which from what ive read is the positraction rear end. However, ive lit the tire up before and it leaves ONE nice tread mark not TWO.

Im getting my information from the glovebox sticker and the RPO codecs that are listed around the forum. The VIN on the sticker matches my trucks vin. Im just wondering if its common for an option to be listed but not actually on the truck? Or if it actually did have the posi and now its gone for whatever reason. I purchased the truck with near 200K and just spent the money to get a new engine id really like to know whats going on in my rear end.

Melonhead
09-04-2009, 11:36 AM
Possible the rear was changed? The G80 is posi. GU6 is 3.42 gears

hillbillymike
09-04-2009, 05:41 PM
posi is wore out.

Athiel0
09-08-2009, 07:58 PM
Thanks its confirmed. Definitely wore out, does anyone know of a rebuild kit? If not is Eaton the best way to go for a new diff?