Bought a 2002 Yukon XL K2500 8.1 liter 4x4

[treehan77]

Can't you look at the RPO codes to determine ratio?

 

[Martinjmpr]

Can't you look at the RPO codes to determine ratio?

Yeah, no need to jack it up, just look at the RPO sticker in the glove box. 4.10 is GT5, 3.73 is GT4, etc. Shoot a photo of the white sticker in the glove box and we can tell you everything you need to know about your truck.

 

[jdpber]

RPO is the fast answer assuming that they were never changed. But i would guess 4.10 as that is the ratio that most of the 8.1 HD vehicles came with stock.

 

[ccapehartusarmyINF.(ret)]

4.10 was optional never standard

 

[MPDano]

Excellent! I will shoot a pic of the sticker in the glovebox and post it.

 

[MPDano]

RPO Decal posted

 

[MPDano]

Says GT4, so I have 3.73 Gearing?

 

[MPDano]

Found a cool decoder: http://www.cadillacfaq.com/rpo/rpo4.php?rpo=gt4&submit=SUBMIT

RPO Code Explanation/Description
GT4 AXLE REAR 3.73 RATIO

 

[Flexx]

Dude. That's a beast. Shouldn't matter what rear is behind that motor!

"It's all about the ripping and the tearing"

 

[treehan77]

Hell yeah if it is doubtable that won't tow it you are working too hard or you need an even bigger boat