hey, car is vibrating pretty bad once it hits like 75mph and higher, It only started when I put in my new trac-loc rebuild kit, I had the axels out, ring gear out, and ring gear off of the trac-loc, and trac-loc token apart, dident touch the pinion, and reused the stock shims agian, ring gear with trac-loc was very very tight going back in, and I dident set the backlash or anything, because i dident touch the pinion gear, any ideas? thanks alot