Any of u guys have struggle with 3.9 motor turning big tires? 32s 33s or bigger?

Biggest I've ever had were 31s which were ok

Just for reference, my truck is 3.9l, with cold air intake, no cat and turbo shop muffler, with 3in exhaust, and jet stage 2 chip(despite what anyone says, had it on since 04 and it made big improvement)

 

With the right gears you should be fine. If you can tow thousands of pounds stock, the bigger tires will make little difference with the right gears.

 

Talking bout with stock 355s

 

Set up a ratio. New tire over current ratio to old tire over x.

33 . . . 31
---- = ----
3.55 . . x

33x=3.55(31)
33x=110.05
x=3.33

Your new effective gear ratio is 3.33:1. This means its as if you had a 3.33:1 rear gear with your current tires. Considering they DID make 3.21 gears for these trucks I'm sure you're fine.