What GM vehicles have a 3.23 gear ratio in the rear differential? (GU5

[R34P3R]

I need to know what vehicles I need to look for at the junk yard. My truck has a differential with a different gear ratio and its making the RPM's go higher. The code for the OEM differential is GU5. Im looking for a list of vehicles with the same code but if possible I would really really REALLY like to find one with rotor brakes. Can anyone help with this? THANK YOU!

[Chris]

You are pretty limited to 99-04 pickups with the 4.3 and 4.8

[R34P3R]

I find that odd since my truck is a 2007 classic. Call me picky but I'd like as specific of a list as I can get. Thanks.

[Chris]

If you want rear discs, the cutoff is 2004

[Chris]

And more specific

 

1999 GMC Sierra 1500 4.3

1999 Chevrolet Silverado 4.3

1999 GMC Sierra 4.8

1999 Chevrolet Silverado 4.8

 

2000 GMC Sierra 1500 4.3

2000 Chevrolet Silverado 4.3

2000 GMC Sierra 4.8

2000 Chevrolet Silverado 4.8

 

2001 GMC Sierra 1500 4.3

2001 Chevrolet Silverado 4.3

2001 GMC Sierra 4.8

2001 Chevrolet Silverado 4.8

 

2002 GMC Sierra 1500 4.3

2002 Chevrolet Silverado 4.3

2002 GMC Sierra 4.8

2002 Chevrolet Silverado 4.8

 

2003 GMC Sierra 1500 4.3

2003 Chevrolet Silverado 4.3

2003 GMC Sierra 4.8

2003 Chevrolet Silverado 4.8

 

2004 GMC Sierra 1500 4.3

2004 Chevrolet Silverado 4.3

2004 GMC Sierra 4.8

2004 Chevrolet Silverado 4.8

[R34P3R]

lol thank you for your time and help!

[Chris]

If you want discs this is your list if you dont care then 99-13 will work

[R34P3R]

One last question... Does the fact that I have a manual transmission change anything about the differential? I mean there is no chance that I end up making the same mistake again is there? Because I'm assuming that the one I installed on my truck is from a truck with a bigger engine and trans.

[Chris]

Shouldnt. The difference would be in the driveshaft.

[R34P3R]

Awesome. Thanks again!