Need Help with my gears

I have a 1992 XJ SPort auto, what axles do i have. I have seen a 35 tag on the rear, how do I know if it is a 35c or not?? I am curious b/c i want to do gears and a rear locker, and I want to make sure to buy the right one.
thanks in advance.

http://www.yuccaman.com/jeep/gear1.html#axle

Compare the pics. If the tag says 35, I'm betting it actually is a Chrysler 8.25 and you've got an AW-4 automatic and 4.0L I-6, right? That's a 3.55 tag...

All Dana 35s used in Jeeps are 35C, because the C is 'Custom' from Dana; chrysler completed the assembly. From 84-89 they used a c-clipless D35, and from 90-01 it was c-clipped.