Do you need to take off overdrive when you go wot.

 

Boy, I hope not. If so, I've been messing up BAD!

Later, Jake...

------------------
Mark P. Jacobs
jacobs@kvr.com

2000 Black Lightning
PSP full meal deal on order
SnugLid on order
Bed Rug on order
Wet Okole seat covers on order

NEED MORE MONEY!!!

 

NO!
Unless you don't want to go tooooo fast.

 

I've experimented at the track with O/D on and off and found that O/D off gives me better times. Also turn off O/D if I'm racing someone on the street, usually. I find the truck to be more responsive to the pedal with O/D off, especially while already at highway speeds, it's like downshifting. But I think at extra high speeds it might accelerate slower. I don't fully understand O/D maybe someone can explain exactly the mechanism(s) involved for me?

Mike

------------------
99.5 Black Lightning
PowerSurge Cone Filter
JBA Jet-Hot coated headers
Flowmaster muffler
So-Cal Lowering Kit; Cal-Tracs traction bars
Watter Wetter
Lo-Jack

 

As far as I know all O/D does is provide the fourth gear.If it is off, you go top in third and it wont shift into fourth

 

I agree with Lightningquick. I was told the exact same thing.

 

Here's a link to a comprehensive, and very informative article on Ford Overdrive transmissions. It's by a guy on my T-bird site that used to work for ford.
http://www.tccoa.com/transmission/

 

Got a question though.... anyone notice that the tranny doesnt really engine brake unless its in OD?

Took mine up into the mountains a few weeks ago and was trying to engine brake down the back sides but it wouldnt. The trans just overrunns until the engine catches up with it- and gives little or no engine braking.

I asked our tranny tech and he wasnt sure if that was normal or not- anyone else notice the same thing?


------------------
Struck by Lightning
Lightningstruck9@aol.com

Furthering the American Quest of Unlimited Horsepower and Crappy Gas Mileage!

 

Lightning Quick is correct, turning off the O/D merely locks out 4th (O/D) gear. If ya feel like you only need to use the first three gears, go for it.
But, the design intent of the O/D lockout is to keep the truck from "searching" for the proper gear when you're under changing loads, such as mountain driving or towing. It's pretty much the most useless control on any car that has one, unless your towing a boat, in my own opinion. The functional equivilent of this is when auto trannys only had 3 gears, and the selector was P-R-N-D-2-1. When they went to 4 gears (and electronic controls) the added the O/D lockout instead of changing the selector. Some of the early O/D's did have a P-R-N-O-3-2-1 selector. The question is, do you want the top end or not, 3rd gear on the 4R100 is 1:1, the same as D on the old trannys.
GBE

------------------
'00 Silver Lightning
should be here April 3rd
Manufacturing Tech at Sharonville Transmission Plant