Our 5,400-pound, 400hp 4x4 has chewed through no less than four 4L60E four-speed automatic transmissions in less than a decade. The failures have included: a smoked torque converter clutch, which ...

The TH400 is strong and simple ... hub and drum with 300M input shaft and the company’s unique reverse manual valve body, the only one we could find with compression braking.

For the price of the trans pan, valve body, and separator plate gaskets, the firmness and quickness of GM Turbo 400 upshifts and ... tubes (consult your service manual for detailed instructions).