I have a automatic and I was really hoping someone can explain to me the pros and cons of overdrive

 

When you can hold speeds without downshifts, use OD.

When you need more rpm's, turn it off.



42RLE—Automatic, Four-Speed Overdrive
Gear Ratios 1st 2.84
Gear Ratios 2nd 1.57
Gear Ratios 3rd 1.0 <--OD Off
Gear Ratios 4th 0.69 <--OD
Gear Ratios Reverse 2.21

 

Pro: changes shift points and smoother shift in acceleration. Helps keep a higher rpm
Cons: if driving highway at 2300 rpm could eat up some fuel.

 

So is it better to have it off or on ?

 

coming down Pikes Peak I would have it off, as a matter of fact, going up too!

 

Yes.

If you are off-road, off. If you are on a flat freeway, on. If you are going up a steep hill, off. If you are driving around town, on. If you see it shifting in and out of overdrive, off….

 

Any place with a 3% or higher grade, turn OD off. This is assuming the stock 3.73's. The 3.21's I am really sorry if you live around mountains and haven't re-geared. My buddies rubi 4.1 is driveable in the Northwest with stock BFG's, 4.10's, and OD on.

 

Get a SuperChips Flashpaq and you probably won't have to worry about it anymore....

 

Lower rpm's= better mileage.

 

The OD off button is there for specific situations such as towing or off-road use where it is desirable to hold 3rd gear. It's good for engine braking or preventing the transmission from hunting between 3rd and 4th when climbing a long incline as well.

Otherwise just leave it on for best fuel economy.