Quote:
Originally Posted by stillsearching
Torque loads makes sense.. it's not an efficiency issue but a durability issue. Still 0.50:1 overdrives seem strange to me...
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Yep, Torque is what kills trannies... Too much, and they break. Torque loads are a critical aspect of gearbox design.
This is exactly why Ford's transmission naming convention includes the torque rating in the name. i.e. a 4R70W is a 4-speed, RWD tranny that can accept a peak input shaft torque of 700 ft-lbs (not engine torque, but torque after the torque converter). Other manufacturers also reference torque ratings in the tranny name, though usually less directly.