What is stock for 87-93???????????

there is a tag on your rearends rear diff cover that has something like 3L08 or 273 etc etc.....if it contains a L as the second digit its a locker...........if not then its an open rear end (one wheel peel)! :)
hope this helps
Jack
 
we have 8.8" rears. they (in stock 5.0L trim) are all Trac lok rears and dont come as lockers. :)

stock ratios were 2.73, 3.08 and 3.27's (for autos, as an option).

might be time for a trac lok rebuild.

good luck.