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When T-45 trannys get hot they dont shift into reverse very easaly. put a tranny cooler on. a tranny cooler will run you about $130 the pump will run you about $200 and the lines and fitting s will run probably another $100 but its worth the money. or just put up with the grinding
shifting in reverse while moving is just going to damage the reverse syncro even more if the transmission has one. If not, then its just going to damage something else even worse.