i have a stock 02 2wd does it have lockers or limited slip?

 

on mine there is a tag on the diff cover that says what type of lube to use.... if you have any kind of stock LS diff, it will be a trac-lock, which is a clutch operated limited slip differential.... i think also there's a tag on your glove compartment door

 

Look at the EQUIPMENT LABEL (on mine under the hood, back to the grille)
CODE N° DSA: AXLE ANTI-SPIN DIFFERENTIAL that means that you have a Limited Slip Diff.

 

Open was the standard. Clutch type limited slip was an option. As said look for a tag or the listing on your equipment tag.