How good are 4.10 gears and AOD?

[Mach 1]

Originally posted by HiFlow5 0


what about tranny life? will prolonged driving at high speeds and high rpm's shorten the life of the tranny? or would a shift kit, trans cool, and such help that problem?

RPM's wears the engine, not the tranny. Slightly higher highway RPM is not a big deal. Cars used to never even have overdrive, and all had 3 speed automatics on the highway. This would be like driving your AOD equipped stang in third gear without a lock-up converter on the highway. No big deal, thats the way all cars used to drive. the only reason for lock-up converters and 4th overdrive greas was for increased fuel economy.

A shift kit and tranny cooler is always a good idea, even in a stock set up.