[Chris1529]

I don't think I would worry too much about the differential as long as it is in good shape. I don't know too many people that run detroit locker on the street though. I towed an open trailer with a 1/2 ton Ford 4x4 (351W Automatic) with an 8.8" rear and stock limited slip. The pinion bearing eventually came out of it.
The rest of the parts looked like new.