Re: 4.56 gears and 33\" Tires?
I'm not saying its the recommended pratice, but there are quite a few folks that run 35s and the stock Dana 30. If your not locked up front, jumping the front end, etc...it'll probably hold. The front locker is what really puts the stress on the D30, IMHO. I'd keep my eyes open for a cheap 77-80 narrow track D30 to scavange the disks and 6 bolt hubs to convert yours from the weak 5 bolt design.
You can pick up a set of decent(more 50% tread) used 35s around here for $250-400 depending on whether you want BFGs or Sxs. Now is a good time to get 'em while folks are moving to 37 and 38s. I'd be inclined to go for the 35s and keep the 4.56s.
77 CJ7, D44s, Detroits, 4:27s, 35 SSRs, HS9500i
84 CJ8, 33s, REP8000