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Re: 1969 SuperBurb build-up (Bagged and Blown!)
I just went thru the same thing... mine is 56" with gear vendors unit. Turned out to be a bad new driveshaft shaft I had made. The new one is a 4" steel shaft its much better but I have a small vibration around 70-75mph I think that's more pinion angle related I need to point the diff down 1 degree. That TKO 600 must point the tail shaft down really low bet you output angle is over -5 degrees. I would start verifying your driveline angles.
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