With both the engine and transmission moving the power and torque at higher revs, I would think that this arrangement would be easier on the equipment. When I revised my diff in my street rod to a 3.73. ratio, the transmission certainly liked it and rewarded me by not blowing up again>>>Manny's Transmissions still lists the Power Drive on his web page. Since it requires the transmission to handle the increased torque, I would be more inclined to go with a higher ratio final drive instead.
Rebuilt THM425 Transmission Rugged and Reliable - T he Turbo-Hydramatic 425 was an automatic transmission developed and produced by General Motors from 1966 to 1978. The THM425 was originally...www.mannystransmission.com