I want to know what kind of gears I have on my hemi. I thought I could check the glovebox but the paper is riped off. Is there a way to find out? I am assuming they all have the same gears stock. So if you know that would be cool too.

 

you can jack up the rear and spin the tires 1 rotation and see how many times the driveshaft spins

 

Yep, chalk mark the tires and drive shaft and found how many times to drive shaft spins in relation to the tire.

What size rims cam with your truck stock? If it was 17s then you likely have 355s. If it came with 20s then you likely have 392s.

You can also request a built sheet on the truck to tell you everything that came with it.

 

Climb under the truck. There should be a sticker on the axle.

 

Like weedahoe said, request a build sheet. Here is the link.

http://www.dodge.com/wccsapp/univers...ull&category=U