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Quote:

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



the set pinion angle had nothing to do with it.
going from under heavy load to relaxed had the pinion moving because of the front of the spring being shot , it would let the rearend yolk move up and down too much.