I have a 96 xj with an auto and the np 231 t-case, so when I put into 4L then start down a hill it pops and shots the whole jeep forward, then some times it doesnt seem to be in 4 lo, I use 4 lo to help keep my speed down and give me the extra torque. Am I doing something wrong in my driving style or is there something wrong with my t-case? Any help would be awesome. btw it has a RC 3.5 kit aal with 31x10.50/15s, and a t-case drop kit.