Look at the tag
On the pumpkin, there should be a metal tag. It's usually at about th 2:00 position viewed looking forward from the rear. The first set of numbers on the second line is your ratio. Mine is an automatic, so it's a 2.73. My tag reads 2L 73 meanining it is a limited slip. Hope this helps...even though you have to crawl under the car...At least you will know for sure, even if it got changed out somewhere along the line so the code doesn't match.