[tommr]

The MT40 was a non overdrive trans. cast iron case I believe and was unbelievably sturdy in its day. Its interesting to see how this aluminum case 1000 trans with overdrive and weighing about 200 lbs less has eclipsed the 40. handles probably double the torque and HP input. Yes a factory TCU is required along with the standalone harness and a linkage mounted TPS. flexplate was $600 and includes bolts, torque converter spacer and a custom machined center hub pilot to keep the tc hub centered in the crank end bore. Bob is the man on these engine/trans conversion adapters and custom flexplates. has done a lot with the GMC V6 engine conversion to various automatics.