Quote:
Originally Posted by phattyduck
3rd with the torque converter locked is only a few hundred RPM higher than 4th unlocked - it won't be much different in sound. Obviously on the flats and mild hills, leave OD on...
Under load, a little more RPM is almost always a good thing - the water pump and fans spin faster (more cooling), the engine torque requirement is lower (hp = RPM x torque) which is better for engine, and it is better for transmission heat (no or less torque converter losses). 3rd locked will be *better* for mileage than OD unlocked - along with being better for the rest of the drivetrain.
For the same set of reasons, 4LO is better when going slow offroad.
-Charlie
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Oh dang, sounds like OD off is pretty much good for everything when traveling a consistent incline. Any idea if ECT does any good or harm in that situation? Since I re-geared to 4.88, I've been thinking of leaving it on all the time since it feels a little better when accelerating from a stopped position (it feels like it jumps into 2nd gear a little too quickly and ECT seems to help a bit with that).
BTW, thank you again for all you super-informative answers! Without helpful people like you and the other posters on this forum, I'd probably be dealing with a busted transmission in the near future.
