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my dad had a problem when he would lift after the stripe it would break the trans . he tried mounts , shafts, shocks and a ton of other things. he went through 4 housing . new leaf springs fixed the problem. its getting to the point where age HAS to be considered on parts, if they are beat on or not

That is usually caused by by pinion angle being wrong

E. Williams 65 Coronet 500 3400lbs w/d, 446, Indy EZ'S, A&A transbrake,Comp 650 lift cam, 6.50 @ 105 mph 1/8th 10.25 @ 130mph 1/4