Originally Posted by RootBeer
Strictly speaking 3.55 vs 3.92. The 3.92s will give you much improved off the line performance because they are limited slip whereas the 3.55s are only launching using 1 wheel.
Other than that, I'll leave it to those that race their trucks.
That's not entirely true...my 3.55's have a lsd.
To the OP...I don't have any first hand experience, but from what I've read, going from 3.55's to 4.56 will be good for about .2 sec.