The Salisbury differential assembly needs to come completely out of the truck and the casing spread to get the differential center out, if you look at the rear of the housing there are 2 holes either side of the backing plate...a spreader goes into those the spread the diff enough to remove the center section, best done on the bench......the rover diff center on the other hand...5 bolts either side and your axle pops out..and then approx 10 bolts for the center "pumpkin" to come out, easy peasy.... And this truck will be all over the world...much easier to locate or ship a center pumpkin to the Tibetan plains than a complete dana60 diff assy.. And now the front and rear diffs are the same so much easier to locate a breaking donor. And have you priced out everything to convert a Salisbury assy to disc brakes lately..???.. With the influx of so many defenders coming into the USA and everyone wanting to convert its made the parts a bit difficult and expensive to find.. trust me, I have salisburys in my other trucks and converted to discs and installed lockers on them...and I've done field repairs on rover axles..I know which is easier, quicker and cheaper.even the camels had rover axles in the fronts....and the camels discos onward had front and rear..