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2002 gt, automatic....do i need to be driving with overdrive off when im just driving around my neighborhood,,and overdrive on when im on the highway? or di i just go but the rpms? any advice would be great
 
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I turn mine off around town. I think it would save a little wear on the tranny not having to shift that extra gear all the time.Actually i leave it on all the time cuz my tune wont let it come on til around 50mph but when i was stock yeah i turned it off.
 

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i leave it off unless i'm on the hi-way overdrive is the weakest gear in our tranny.
 

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yea you will be alright around town with the overdrive off. all it does is add unnecessary load on the engine at too low of speeds(city driving) the only thing it is there for is mileage(highway crusing)
 

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cool,,ive been keeping it off untill i hit about 60mph, then i kick in overdrive. is that too high of speed when driving with overdrive off? its about 4000-4500rpm
 

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There's a difference between OD and torque converter lock-up. My tune doesn't allow lock_up until I hit 65mph. But it will shift to OD any time the load says it's ok. You'll get better gas mileage that way. Been driving it that way for 1-1/2 years now and no problems.

You do have to watch it if you go to WOT when it's in OD or when it's locked-up. That downshift under WOT can, and will, screw things up. So if your doing roll ons from cruise, make sure you manually get it in the right gear first.
 
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Jakes said:
There's a difference between OD and torque converter lock-up. My tune doesn't allow lock_up until I hit 65mph. But it will shift to OD any time the load says it's ok. You'll get better gas mileage that way. Been driving it that way for 1-1/2 years now and no problems.

You do have to watch it if you go to WOT when it's in OD or when it's locked-up. That downshift under WOT can, and will, screw things up. So if your doing roll ons from cruise, make sure you manually get it in the right gear first.

Oh yeah WOT into OD equals broke input shaft for sure. My car wont go into over drive no sooner then 120 something i think at WOT which ill never reach in the 1/4 unless i get some serious mods.
 

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Any time you can drop 1-1,500 rpms during a consistant rate of speed for any considerable length of time will (over time) substantially increase your mpg.

Your tranny was designed to leave the overdrive in the ON position for all normal, routine driving. The switch was put in place to dis-able the system during periods of heavy use....like in the mountains..up and down..
 

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JimmyBoy said:
2002 gt, automatic....do i need to be driving with overdrive off when im just driving around my neighborhood,,and overdrive on when im on the highway? or di i just go but the rpms? any advice would be great
better gas milage on the freeway. On the street, it won't make that much difference.
 
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