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Before bolting the transmission to the motor, it's essential to check for proper clearance between the torque converter and flexplate. After making sure that the converter is fully seated into the input shaft, and after test-fitting the trans on the motor, there should be a 1/8- to 3/16-inch gap between the flexplate and the converter mounting pads. Since the converter expands as it heats up, too small of a gap will place undue stress on the transmission pump and crankshaft thrust bearing. If the gap is too tight, an easy fix is machining material off of the converter pads, or shimming the bellhousing away from the back of the motor. If the gap is too large, washers can be installed between the converter pads and the flexplate. Per the recommendation of Phoenix Transmissions, we set the gap at 1/8 inch. View Related Article
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