Quote:
Originally Posted by BHM298
Will any of the newer six speeds work?
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The T56 six speed will work but the trans tunnel will likely need some re-work. The T56 clutch housing is HUGE. The TH400 3-speed automatic transmission is a better choice. It first appeared on GM passenger cars in 1965. For first-generation Camaros, it was only available in, and was the only automatic transmission for, big-block V8 engines. In 67 and 68, it was limited to the L35 325 hp and L34 350 hp engines. In 69, the TH400 was also available with the 396 and 427 solid lifter engines (you know them as the monster motors). The model number comes from the nominal transmission torque capacity, 400 lb-ft of torque.
My 650 HP 650 ft-lb ZZ572 is backed up by a TH400. In 15,000 miles it has not been a problem. Don't let anyone tell you an overhauled TH400 won't stand up to a small block!