you do NOT want to install your own gears.... its not just a bolt in and go you need a backlash check, pinion depth check, crush sleve and the pinion nut have to be tqed down right, alot of this and that and the wear pattern its alot of crap that if you dont know what you are doing you had better not mess with it, its well worth the extra money to get a pro to install your gears.