$2500 would be a good deal if the axles are in good shape. If you get and air-locker, you'll have $1200 in each axle so you're getting that plus you can put your used axles on the junk 80 and sell it for $2000
That’s a big “IF”. And swapping locked axles on to a rig that came with open axles is a pain in the arse! You have to make sure you get EVERY little electrical piece....... helped do it once, that was enough for me! Lol
Actually the guy I helped said by the time we were all done with it, he really didn’t save that much $$$.
If your open, but want to be locked I would go Aussie in the rear with a selectable up front. Right around $1500 out the door. (That’s with you turning the wrenches)