At Mopar dealer we used to use the case spreader and do bearings and gear replacements/service while the differential was still in the vehicle. Not just for the dana 60, several diffs it was required (per manual) for ring and bearing service. I never did one on the bench with the diff removed.
Copper
I have read and reread this at least a dozen times and I am still scratching my head. Are you maybe a little confused on which part is the differential? I have done at least 1000 Dana 44, 60 and 70 r&p setups and you are absolutely not going to change a r&p and bearings without removing the differential from from the case.
