Quote:
Originally Posted by Pontiac1976
The big thing with any A/T trans overdrive is to keep the speed/RPM over the up shift or down shift points. If your going drive just at the speed/RPM where it down shifting every few seconds it will kill any A/t Trans in time. So you should not drive in over drive un till you can keep the over drive speed/RPM in the gear. get a good cooler!
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I haven't even seen that much mpg difference with OD. One time had to drive up to the RR station in Malta about 200 miles each way and about halfway up there discovered I was still in drive. Still averaged almost 16mpg at ~65mph round trip, which is pretty okay for a 4wd Suburban.
Pulling a trailer over McDonald Pass, I found that it would stay in Drive/high until it slowed down to about 30 mpg then finally shift into 2nd and roar back up towards 50 then shift back into drive and start slowing down again.
Enough with that, I would just manually drop into 2nd about 45 mph and hold it there all the way up with no extra throttle.
Even if it wasn't verboten, I can't imagine towing in OD with my transmission. I wish I had a 2500 with the better automatic ...