How do I tell if I have a limited slip rear diff? I want to change the fluid and want to know if I need to put in the friction modifier. I have a 2001 Ram, 360 cid. I got it used so I don't have the sticker.

Thanks

 

there should be a tag on the rear diff, if not, jack up the rear and spin 1 tire, the other should spin the same direction, if not and it spins in the opposite direction, it is not lsd