does anyone know?

i have an automatic and on the shifter it says P R N D(with a square around it) D (without a square around it) 2 1. whats the diff. between the two D's 

Welcome to the forum.............one is overdrive.......use it when you drive over a bump

ohh lol thanks, do you know which one?

Welcome to the forums.  Tell us about yourself and your car, or just tell us about your car. Post some pics when you get a chance.  The D with the sguare is the overdrive, plain D is regular drive.  Use the OD when you are cruising, D when you want to pass.  Its kind of like a whole nuther gear.

yep...it actually is another gear...

1=1, 2=2, D=3, OD=4

welcome!

Isn't it 3 and kicks into a 4th when you cruze to save on gas?

welcome!  dont use it over a bump lol

so should i keep it engaged while driving?

yep just put it there the whole time......if you want to make a pass you can drop it down, but dont have to. The trans will shift to third when you mash the gas,and go back th the od when you drop rpm's.

Leaving it in OD will allow it to shift thru gears 1-4...if you leave it in D it will shift thru 1-3, likewise if you leave it in 2 (1-2), and 1 (stays in 1st)

I leave mine in D, bc if you leave it in OD it will shift into 4th @ 40-45mph which is to low for me (I like the rpms up)

I bet that works out great for engine wear and tear, also good for gas milg..........

ok thanks everyone!

i know, have u notice how much time u spend at the gas station.