I just did the one on my RRC e-series LT230 and it was a piece of cake.
Yes, put new bearings on the new gear before the swap out, and swaping the rear race is not a big deal, I left the front in. I did not need a puller, just put the T-case in neutral and the gear comes right out and goes right back in as well. Easy smeezy job. The rear race is in the inner cover, no prob.
I did my stub shaft at the same time since it was a ZF 22, no more klonks, all gone.
72 Series III 109 SW Diesel, 03 RR, 98 Porsche 986, 01 Porsche 986 3.6 L