I forgot ... we did run some powerglide automatics for 1 season & did chassis dyno test them.
These ran NO converter, nor clutch, so they were light & designed to lock the gearsets hard. With only 2 light gear sets & nothing else they used less power than typical automatics.
The numbers were 19.1-19.4% difference (loss) from the engine dyno.
But, I don't think we can compare these #'s to the automatics in street cars, even well built pro touring cars.
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