Originally Posted by Uno1982
So i climbed under my truck and guess what!!! My quad cab 2005 1500 3.7 v6 ram has a freaking 3.21 rear end with stock 21 inch rims..... WTF???!!! What was dodge thinkin even letting this off the lot? They should have known this much truck with rims that large would make this truck try to buck out of 6th gear with the smaller engine. I've read where tons of people are swapping over to the 3.92 because of this very issue. I may be looking around for a rear end shop very soon.
I'll keep you posted.
Part of your issue, it that is a big, heavy truck for a 3.7. 3.21's aren't helping anything, but don't expect V8 power with a gear swap. I'm not sure what vehicle you came from, but your expectations may be a little much.