How do I figure out what gears I have? I have looked at the stickers under the hood and inside the door jamb. Can someone advise...

 

If you have the G56 manual transmission on your 2007, you will likely have 3.73 gears. Your engine will turn about 1,600 RPM at 55 MPH in 6th gear and about 2,100 RPM at 70 MPH. If you have the automatic the engine will turn a little slower at the same speeds with the 3.73, and a little faster if you have 4.10 gears.

 

Mine is on a sticker in the glove box... I don't know if they still do that or not, but it doesn't hurt to look.