Overdrive off...?

Kotta390 · Jul 12, 2015

What is the differences between overdrive on and off. The only thing I can tell is the shift points are moved some and that's it? I couldn't tell if the shifting got any firmer or anything else?

clh1220 · Jul 13, 2015

How are you turning over drive on and off.

Mr. Crowley · Jul 13, 2015

Overdrive is typically just a higher gear to allow lower rpms for better gas mileage on the highway.

Turning it off just stops it from shifting into that gear. Nothing else would really change.

Kotta390 · Jul 13, 2015

I'm sorry I meant to say turning on Tow/Haul mode. I'm so used to the overdrive feature on my previous cars.

Ratket · Jul 13, 2015

should not let the truck shift into 6th if a 6 speed or 8th if a 8 speed, also as u apply breaks it will tell the truck to down shift to help u slow down, it will also hold gears longer- I use mine when city driving so the damn thing isn't running through all the gears from light to light.

loveracing1988 · Jul 13, 2015

Ratket said:
should not let the truck shift into 6th if a 6 speed or 8th if a 8 speed, also as u apply breaks it will tell the truck to down shift to help u slow down, it will also hold gears longer- I use mine when city driving so the damn thing isn't running through all the gears from light to light.

The 8 speed will run through all 8 gears.

Kotta390 · Jul 13, 2015

So basically all it amounts to is slightly different programming of the transmission and nothing more. Interesting it will stay in 8th gear while towing, seems a little sketchy.

clh1220 · Jul 13, 2015

Kotta390 said:
So basically all it amounts to is slightly different programming of the transmission and nothing more. Interesting it will stay in 8th gear while towing, seems a little sketchy.

It can go into 8th.. Tow haul changes your shift points. And the 8 speed doesn't need to be in tow haul to start down shifting when you hit the brakes.

pickupman66 · Jul 13, 2015

on my 09, when I use Tow Haul, I can feel it hit overdrive but it does not lock the torque converter (i think) it changes the shift points and disables MDS. I love the way it downshifts.

QwikKota · Jul 13, 2015

pickupman66 said:
on my 09, when I use Tow Haul, I can feel it hit overdrive but it does not lock the torque converter (i think) it changes the shift points and disables MDS. I love the way it downshifts.

The manual for the 6 speed auto says it locks out overdrive. In the 8speed the only way I can get mine to go into 8th in Tow/Haul is to use cruise control. I think it's the same on the 6speed but anything under 1:1 ratio is typically referred to as overdrive. Both tranny's have 2 top gears like this. In manual transmissions, 4th gear is typically 1:1.

Andy578 · Jul 13, 2015

Ratket said:
should not let the truck shift into 6th if a 6 speed or 8th if a 8 speed, also as u apply breaks it will tell the truck to down shift to help u slow down, it will also hold gears longer- I use mine when city driving so the damn thing isn't running through all the gears from light to light.

8 speed uses all 8 unless you use the manual mode to lock it out. also 7 and 8 are both overdrive gears on it

Overdrive off...?

Kotta390

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clh1220

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Mr. Crowley

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Kotta390

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Ratket

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loveracing1988

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Kotta390

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clh1220

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pickupman66

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