HELP: don't know what's wrong
 

PROBLEM: when making, U-turns, the car tends to slow down or it requires more power to exit the U-turn.

I already replaced the rear differential and it still does the same thing. So I was wondering, before I go any furthur, if anyone has experienced this. What could it be? T-case? Front diff? Low fluids?

stock wheels and any orther mods

do you hear any unusual noises when your making these u turns