I know at the track you should turn off the OD for the run. But how fast can you drive with OD off for extended periods of time? Is it safe cruising around at 60-90mph?

Thanks

 

whooops, we supposed to turn off at the track? lol, i dont think i have ever taken it off

 

Thats good to know since I'm going to the track tonight!!

 

There is absolutely no advantage of turning the O/D off... as a matter of fact there are some disadvantages, such as poor gas mileage and more wear and tear due to more RPMs.

 

It breaks down like this.
Gear----Top Speed(mph)
1----43
2----76
3----119
4----142

This is on a 2004 vehicle with stock tires and rearend. I would assume this would be accurate with the 2001 and up. I believe they all had the 3.73 rear.

 

I keep mine off until around 55 to 60 then I switch it on.

 

Agreed. If you are cruisin, the truck goes into overdrive for better gas mileage, less wear, etc. If you want to run it hard, then it will downshift to give you the power. It is a win win situation. You should never turn off the OD unless you are towing or something like that.

 

Thanks for the info

 

I was told by a tuner though when your at the track and doing WOT the OD should be off. He said that in that situation the OD causes more stress on the tranny

 

Gregg Evans has said the exact opposite. I will stick with what he says. Basically, Gregg said "don't F*CK with the O/D off button!"

 

i second the "dont touch the od button", at the track not a big deal, your probally only hitting the higher rpm's od would take care of for a few seconds, plus the od bands arnt as strong as the others, not made for high rmp hard shifting.
but around town i have seen my tranny temp guage go up as high as 20 to 30 degress with the od off, as soon as i put it back on it will creep back down. at first i turned the od off on the stock program and one other program i had because lockup occurs to early on fords program but a tuner can delay this with a chip and it is much more responsive around town with out lockup, and the truck still goes to overdrive, i belive i also have overdrive delayed till 55 or 60..


jim

 

If you are running a road course, I could see turning the OD off. But L's are very rarely used for that. You don't want to keep shifting from 4 to 3 to 4 to 3 to.. well you get the point. Otherwise, leave it on. If you are at the strip, you will more than likely be going WOT. You will never hit 4th unless you manage to get to 119mph going down the track. I think there are very few L that do that.