UPDATE...
Just heard from the shop. It appears to be F.I.X.E.D.
He said the transfer case took care of about 90% of the shake, and the remaining 10% was remedied by the left front CV axle.
Quick breakdown for those who requested...
Reman Rear Drive shaft: $425
Install Rear Drive shaft & new guibo: $350
Transfer Case Fluid Drain & Refill: $160
Reman Transfer case: $1425
Left Front CV Axle: $95
Remove & Replace Transfer Case & Axle + fluids, test driving, etc.: $850
So that right there is right about what I expected to spend over the first two years of ownership getting it caught up on everything. Of course, that's over 4 months, not 2 years. And I've also spent about $600 on random services and parts, and I'll drop another few hundred servicing the transmission.
But at least now I can leave town.