Sierra 2015 - Changing the rear end ratio?

[tmo]

Hey everyone, I have been pondering the idea of changing my rear end ratio in my truck. I currently have the 3.22 with the V6 engine. I believe the Crew Cabs came with 3.42 in the V6 so I am kinda shocked that the double cab didn't also. Anyways, lately I feel like my truck has been sluggish (always has been, but bothering me more lately) and I feel like this might be a pretty easy (only) fix.

 

If I was able to go this route I would be interested in using the rear end out of a 2004 5.3L Tahoe with 100k miles. I believe it has the 3.42 gears and if the car is gonna be kept for spare parts then I might as well use it.

 

I feel like this is going to be the only way to get the swap done if I do it because I don't feel like paying 1000 dollars for something that I already have. I am hoping someone would know if the swap is possible since there is a 12 year difference. Thanks for any information.

[redwngr]

I think both cabs were 3.23 std for 2wd v6 and 3.42 std for 4wd v6

 

Is yours a 2wd?

[tmo]

Oh maybe, but I'm certain that I saw a 2wd cc on Carmax with the 6 cylinder. Maybe that truck had like a tow package or something. Anyways, I feel like that would be best for my mileage and for my "lead foot" and not to mention the ability to pull a bit more of the need ever arises.

Yes mine is a 2wd.

 

 

Sent from my iPhone using Tapatalk

[thejimmian]

might be able to swap the gears but that will require teardown and setup in new housing, you will not be able to swap the axle assembly unless you have an extra special 1/2 ton tahoe with leaf spring rear suspension.