do u use (d) or d? differences?

[Bboy_Jon]

Ya uhh whats the idfference really between the (d) and the regular d?

i know the (d) is overdrive but what does the regular d do differntly?

i have a 97 lumina ls

[MagicRat]

Originally Posted by Bboy_Jon

Ya uhh whats the idfference really between the (d) and the regular d?

i know the (d) is overdrive but what does the regular d do differntly?

i have a 97 lumina ls

The regular drive position just locks out overdrive, so you just use 1,2 and 3rd gear only.

This is helpful if you are towing a trailer or driving in hilly terrain at highway speed. Under those circumstances, if you are in (D) the trans will hunt or shift a lot between 3rd and overdrive. This makes the car feel more sluggish, slower and is a bit annoying.

Locking it in 3rd prevents this.

[Bboy_Jon]

Originally Posted by MagicRat

The regular drive position just locks out overdrive, so you just use 1,2 and 3rd gear only.

This is helpful if you are towing a trailer or driving in hilly terrain at highway speed. Under those circumstances, if you are in (D) the trans will hunt or shift a lot between 3rd and overdrive. This makes the car feel more sluggish, slower and is a bit annoying.

Locking it in 3rd prevents this.

so uh would it be a bit faster in like regular street conditions to use regular d??

[corning_d3]

It doesn't matter, you'll just lose gas mileage. Something to note...the Torque Converter Clutch will still lock-up in D..around 46mph to be exact..

[Bboy_Jon]

whats the torque converter clutch

[corning_d3]

There is a clutch inside the torque converter. This clutch engages when the turbine, stator and impeller inside the torque converter are nearly the same speed. The clutch locks up for improved fuel mileage and also reduces the temperature of the transmission fluid, because there is less fluid shear(The torque converter is the main heat generator on a transmission). A torque converter uses the same principle as two fans pointing towards on another. If you turn one of the fans on, it will make the other move. This applies to a torque conver the same way, but has added features. The fan blades inside the converter are called the impeller and turbine. The impeller is mounted to the converter body and driven by the engine. Fluid is pumped into the converter by the transmission pump. The fluid acts as the air does with the fans. The turbine is connected to the transmission input shaft. There is another part in between them called a stator. It's mounted on a clutch that allows it to turn only one way. The stators job is to re-direct the fluid so it hits the turbine at a smoother, shallower angle...Which increases efficiency. A torque converter is actually a torque multiplier. When the impeller is running at high speeds, and the turbine is still running slow, it creates a torque multiplication. This is caused by the stator. If you removed the stator, a torque converter would just be a fluid coupler.

Here's a great website with picrtures on how the converter works: http://auto.howstuffworks.com/torque-converter.htm
My fingers are tired now.....

[Bboy_Jon]

geez

lol ok so basically is it worse to drive in regular d on normal conditions than (d)

[corning_d3]

As far as fuel mileage, yes. It's better to let the transmission think for itself under normal conditions, anyway..

[jeffcoslacker]

You'll get a little quicker response to throttle, being in a lower gear range and not having the delay of the downshift from OD to D when you drop down on the throttle, but not that much, and you'll loose around 4-5 MPG driving in D all the time.

Not really worth it...

I only use it in the conditions described above (not towing but rolling hills at 45-55 mph where the constant up/downshift gets annoying)...and when I pop over a rise at 80 or 90 mph and there's a state trooper sitting there on the shoulder...slows me down nicely without that "Look, officer, I'm speeding like a MoFo" hard brake body squat that just nails you when it catches his attention

[corning_d3]

LOL, with your Lumina lowered that much, your body squat should be.....what? A 1/4 inch? HAHA

[Bboy_Jon]

lol, its not real it was (id like to say photoshopped but from what he told me he did that in paint)

[corning_d3]

Thas cool, im'a try that with my monte