I think auto's were 2.73, 5-spd came with 3.08. As for knowing which ones you have, the car may have a code in the door jamb for it. Use the search function, this has been gone over a bunch, I' m sure you could find out more that way.
2.73's, 3.08's and 3.27's I believe were the ones available. I forget how to tell which ones you have but I know there is a way. Something about a tag on the rear diff but I forget exactly. Someone should be able to tell you.
I think auto's were 2.73, 5-spd came with 3.08. As for knowing which ones you have, the car may have a code in the door jamb for it. Use the search function, this has been gone over a bunch, I' m sure you could find out more that way.
Not necessarily true. Mine came with 3.08's. So its not as cut and dry as autos have this 5-speeds have that. The tag on the door jam / rear diff is the only way to know for sure. Sorry I dont have the codes. Try the search function like Hef recommended.