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Message: <blockquote data-quote="Jrgunn5150" data-source="post: 500237" data-attributes="member: 9682">Before I knew how to rebuild transmission and rearends a few years ago, I had a local shop install some 4.10's for me... Had the same problem, bad vibrating at speed, coming up through the shifter.I goofed around with the exhaust for days (it was also new, thought it might be rubbing) and finally my T45 cracked in half... Rebuilt it, it cracked in half again. Had Promotion build one, cracked in half.I was moving to California and the second one I rebuilt cracked in half for the FOURTH time in like four months.I bought a Viper spec T%^, had it shipped to where I was, rented a garage bay, bought a dial indicator and went to swap the 4.10's for 4.30s, and found out the assholes at Akron Horsepower put my rear end together with NO SHIMS!!!My advice, get it up to speed, get it to do it, and throw the car in neutral, that will narrow it.</blockquote>