700R4 transmission in OD or Drive?

[87transamrulez]

I know you guys talked about it in another thread but i am so confused. So if i am flooring it do i want to have it in drive or OD. And what is WOT. Thanks

[stepho]

Wide Open Throttle (flooring it)

As far as I know it doesn't really matter. I believe OD just means that when you are cruising at the same speed it shifts into a "over drive" gear that is supposed to save gas? As far as I understand it there isn't really a difference (I drive a standard it doesn't affect me so.)

Someone else will probably come along sooner or later and explain it fully.


Edit: http://www.automotiveforums.com/vbul...ght=over+drive here is the other thread about it.

[Rally Sport]

Put it in drive if you're racing but have it in overdrive if you are not.

Overdrive shifts it to the last gear to save gas.. overdrive gives you one gear less for best acceleration. Manual shifting isnt suggested btw on an automatic since the computer will do just fine.

You'll notice a difference even during WOT when you have it in drive or OD.

[poormillionaire2]

Actually, you can just leave it in OD all the time. When you step on it, the computer will kick down the tranny for you (in an auto) and shift when it needs to. If you leave the selector in a lower gear, that basically tells the computer not to shift past that gear. So, if you have it in 2nd or 3rd (D) at WOT and your not paying attention, the engine will keep reving in that gear and that could cause major problems.

[87transamrulez]

Ok thanks guys, makes since to me now.

[silicon212]

Originally Posted by poormillionaire2

Actually, you can just leave it in OD all the time. When you step on it, the computer will kick down the tranny for you (in an auto) and shift when it needs to. If you leave the selector in a lower gear, that basically tells the computer not to shift past that gear. So, if you have it in 2nd or 3rd (D) at WOT and your not paying attention, the engine will keep reving in that gear and that could cause major problems.

Some transmission shift kits, as well as some factory transmissions (in 9C1 cars for example) are designed to allow a WOT shift into OD - this is to help top-end speed in the case of the 9C1, for a high speed pursuit.

Remember also that the TH700R4 or 4L60 are mechanical hydraulic shifting transmissions - the only computer hookup drives the TCC. The 4L60E is shift-controlled by the car's PCM.

[Jcrane88]

Originally Posted by silicon212

Remember also that the TH700R4 or 4L60 are mechanical hydraulic shifting transmissions - the only computer hookup drives the TCC. The 4L60E is shift-controlled by the car's PCM.

IV'e been needing to know that! my dad has a diagnostic scanner, last time i plugged it into my car the computer never told the scanner that i was in O/D or that My TCC was locked...is it posssible that the computer just doesnt know?? also where is the tcc plug so i can check if it is plugged in?

[silicon212]

Originally Posted by Jcrane88

IV'e been needing to know that! my dad has a diagnostic scanner, last time i plugged it into my car the computer never told the scanner that i was in O/D or that My TCC was locked...is it posssible that the computer just doesnt know?? also where is the tcc plug so i can check if it is plugged in?

With apologies to Blue Bowtie,



Terminal F, when grounded, should engage the TCC. A scanner won't tell you anything about a TCC solenoid failure on these.



If you look at the plastic plug near the back of the side on this, in front of the governor cover (the black dome thing), that plastic plug is the TCC wiring harness connector.

[Jcrane88]

your my hero,
now, i just need to figure out why its not shifting into O/D and my TCC aint locking...or why its not telling the scanner.