I've re-geared and ARB'd AMC 20 axles and Dana 44, both basically the same as the Dana 60/ Salisbury, shims dial gauges and engineers ink to check the work in out in out in out till its' all correct. My last set of racing axles were 9"Ford hybrid 3rd member no skims nice.
But that was all about 15 years ago.
I was kind of looking forward to the challenge!!
Cain