"The additional torque required not only a heavier propeller shaft: the Torqueflite 3 speed automatic gearbox was uprated with the 440 cubic inch engine's torque converter and internal clutches."
Instead of the Chrysler standard 360 propshaft and gearbox.
But I have heard of uprated engines running fine without upgrading. I guess it depends if you are drag racing or not.
I think P. Wilson's drive train was upgraded to BF spec when Bristol did the superb restoration.
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