TM 9-1710A has all of the information you need to set up the differentials. It's just a lot of tedious moving the pinion in & out and the differential back & forth until the contact pattern and backlash are satisfactory. But the design of the rear axle makes it a pretty easy process. As far as pinion shims go, you might try Dana Spicer. They have very helpful tech support and they should be able to supply any of the stuff you need for the job or direct you to a source.
