Quote:
Originally Posted by Carousel72TRed
Does anybody know what the torque converter stall/lockup speed was on a stock TH 400 transmission? I've been told varying stall stall speeds from 1200-1800 rpm . My car came with factory AC so I believe the rear end ratio in my car is 3.23. I've also heard the peak torque rpm on a Pontiac 400 is around 2300 rpm so the best torque converter for this would be one that is around 2000-2400 rpm? Of course it may not do much good getting an aftermarket 2000-2400 rpm stall speed torque converter unless you have a limited slip or positraction rear end.
Carousel72TRed
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Pontiac engines produce prodigious torque low in the rev range, but peak torque for GTO 400 (350 HP in 1969) is approximately 3000 rpm.
From Revmaxconverters.com: "In general, the desired stall speed should be 500-700 RPM below the engine RPM at peak torque. This ensures a margin for application for the torque converter to take off. You don’t want to have to floor your gas pedal and wait a few seconds for your vehicle to move. "
Higher stall speeds mean higher heat, faster trans fluid breakdown, likely higher engine operating temps and drive line stress. Just keep your wits about you with your decision.