Yes, hit or miss whether it was lock-up. Balance is uniqur to 5.9 magnum if I understand, so you need the flexplate/balancer for your year engine. To make it more complicated, sometime during the engine run from 1993-2003, they stopped putting weights on the flexplate and put them on the convertor (or vice versa, it gets confusing). Bottom line is get everything you can with your donor engine and know what year it is