Thanks for the reply.

I haven't dug into the differential yet, but in the paperwork I have from the previous owner, I see a receipt for a Detroit locker, and the wheels definitely chirp when I go around corners while giving just a little gas.

The previous owner kept all his paperwork, and there is no mention of machine work on the axles so I'd be surprised if the axles were shortened. All I see in the paperwork for the disc brake conversion is that the customer supplied spindles, rotors, calipers, and bearings. I will definitely measure the axles though. Just gotta unbolt everything first.