ok heres the deal. I have a 6.2 liter k10 1985 blazer with a 3.42 differential ratio. after a brief offroad trip i heard a knockin', so i figured something was wrong. pretty much to some it up the rear differential was torn to pieces litterally. now i need a new rearend. ive heard that the 3.42 ratios are pretty unreliable so i need advice one what i should do. i am contemplating either gettin a new 3.42 rearend. or i am going to try to put a different gera ratio on the blazer such as a 4.10 or 3.73 , but if so what steps to i have to take to change the gear ratio and how much $$$money am i lookin at spending??? Im running 35x15x12.5 rubbers and i have a three inch lift . any advice will be greatly appreciated.