ok well at low speeds in mostly any gear, being off the pedal completely, i get a shutter, get pretty harsh at time, and only stops if you get on the gas some, or push in the clutch. this has been goign on since i did the tranny swap, and ill eliminate some things first, i did change the U joints. also when i did the tranny swap i still used the auto drive shaft, i called ford they said i could use it, its a little short but doesnt make any differnce. the only thing i could think of is maybe the rear end is going out, but if it is goignn out it should have been out by now, cause i do long burnouts, and drive it hard all the time. what do you guys think