I blew out my extension housing seal, so I took my driveshaft off and noticed I could turn my pinion (reaerend) about 2-3 inches (with both tires on the ground) Isn't this way too much, I installed 4.10's and a powertrax about 4 months ago and can't remember how much play was in it. I am having vibration problems which are usually worse when i let off the gas. Is my rearend fubard!?thanks for all responses.