looked at my axle code, sound right?
 

it was R6, and thanks to TRS i came up with this

R6
L/S 8.8"
2750
3.73

i didnt know for sure that i had a limited slip till now
it always kinda seemed like it, but i was never sure.

i need the code for buying a tuner, just wanted to make sure i got it right.

If all else fails try looking at the metal tag on your axel. It will say something like 3 L 73. This is on mine and it is pretty obvious that it is a limited slip 3.73

Thats correct