Overdrive on or off?

[Zouka240sx]

Is it better to leave the overdrive on or off? I've heard it's better to just leave it on, but doesn't that have a negative effect in the long run?

[Razi]

Leave it on.

[nismoracingsx]

with the button not pressed in, you're essentially removing 4th gear...runs your engine harder and kills the gas mileage..

[Zouka240sx]

Good to know. I've just been switching back and forth and started to notice the gas mileage was horrible so while I had gotten the advice to leave it on, I wasn't 100% sure and then someone else had told me the constant switching was normal. Though doesn't that heat up the transmission and shortens the life of it?

[turtle240]

yea i made that mistake before the 5speed swap. i had it off and didnt know it so i put the pedal to the floor to see what it had and then my trans started smoking. once i realized it it hasnt smoked scense

still i added a little fluid to compensate for the stuff that burnt uponly like 1/2 a quart i needed some anyway