i have a 1986 chevy k10 it has a 350 smallblock and a thm-350 3 speed auto trans. but when i put it in reverse it makes a clunk and the back of the truck pops down. whats wrong with my trans???
Do you have a lift kit? It sounds like the universal joints might be bad on the rear driveshaft, or something else is loose and allowing quite a bit of play. A lift kit often puts a lot more stress on the driveline because it screws up the pinion angle.
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