I have 2 Detroit lockers, both 31 spline. Can bring to OCBR
One of them I bought new in 2005, right before United by Bronco in 2022 I stripped the splines off the axle on the left side, I replaced the axles and on test drive seemed like it was popping more than normal. This text drive was on pavement, due to me headed to Utah I didn't want to chance it so I pulled it out. It could be fine or might need a rebuild, has good bearings - $100
I could not get a new locker in time for my trip so I bought a used roundtrack detroit, have run it from March 2022 until August 2023, has always done the job but is very noisy, rachets and pops all the time in turns, I replaced with a new Yukon. Has new Timken bearings - $325