martin2774

Hi All

Could someone please tell me the differance is in driving with the OD switch on and off.
My shifting problems see to be not as bad with the OD off.
I do mosty city driving and almost never get to 70 mph even on the freeway.
Do I even need the OD on?

Thanks for the help!
Martin

TORTIS

iTrader: (1)

read your manual. I drove with mine of in off in town, and on when driving over 55mph.

keithguts

same here......................

thefallman

you ever think that his truck may not have had a manual with it when he bought it?????

Victor

OD allows the trans to engage 4th gear. Locking it out (turning OD off) just gives you 1-3 gears. Good for city and hilly driving. I think the autos also have another switch that affects shifting - raises shift points slightly

thook

Is what you're saying that your transmission seems to downshift a lot and not stay in overdrive? Get used to it...lol. Overdrive is the top/fourth gear of the transmission. Otherwise, it functions as a three speed. The consensus seems to be the 3.0 mated with an auto transmission is not powerful enough maintain overdrive under load. Some even say it's due to inadequate factory gearing.

I only use overdrive on the freeway when it's relatively flat and doing highway speeds. Otherwise, it's not necessary...and really kind of a pain. Moreover, it's harder on the transmission and mileage and even not recommended with lots of hills and pulling weight.

EDIT: Looks like someone beat me to it...haha

Karisch7

OD is to lower RPMs and save gas. Its used for highway driving. If i'm not mistaken, you can get some more power through engaging ECT (if equipped) which puts the gear-shift points at higher RPM.

martin2774

Thanks for the help everybody!

Tim_Snapple76

ECT (if equipped) which puts the gear-shift points at higher RPM.

ditto

3.0 isnt strong enough to pull in overdrive under a load. city driving with OD off is fine.