I'm sorry that I hadn't seen all of the activity on this thread about the lockers and the possibility of the swaps.
There were some of these axles with factory No-Spin lockers manufactured under the "Trach-tech" name by Eaton. Later the differentials were upgraded to the Detroit name when full case lockers became available for other applications outside of the factory Eaton. The original no-spin is still being replicated by many many other companies. The cheapest way to install one of these aftermarket lockers is to aquire a set of GM 14 bolt axle shafts of similar length to the housing you have, whether it be a DRW or SRW housing. The shafts are 1/4" or so too long to work properly, in some applications, but have been known to slide right in for other folks. Some just use a chop saw to cut the ends off square but if you know ANYTHING about axle shaft spline theory you would know this is a BAD idea. Instead shims should be used behind the flange between the hub and gasket to offset the shaft to keep it from bottoming out on the housing. I can manufacture said spacers
