i am going to motive 4.10's. my car only has 6000 miles on it. the mechanic would prefer to have the bearing-install kit. it is supposed to make the job easier. do you guys think i should pay the 90 bucks for the kit or take my chances and hope it goes smooth? maybe if it takes longer to install without the kit it would have been better to just buy it then to have more labor charged to me. he say the bearings can get jammed in there. what do you guys think?