another thing to check is the u joints, I've had simular problems with a ranger. this is easy to check somethimes. Just go under your car and see if u can move the driveline around the u-joint area-like up and down motion. Another way to trouble shoot is to put the rear end up on jack stands and drive it like u would, have a friend watch to see what shakes at that speed.
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66' Mustang 2bbl 289 coupe, stock.
79' Mustang soon to be a 302-selling-
89' Bronco 351w
AIRMEN FIRST CLASS
KASPAR T. HOWE
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