Your gear is plenty good enough for ubers. I would maybe try and get a little more crushing blow since it makes killing them much easier.
You've got wayyyy too many lifetap items which is unnecessary since last wish has a 10% chance to cast level 18 lifetap. But they're all very good items so It may not be necessary to change them.
I use my lvl 85 hammerdin and I'm able to kill the ubers with no trouble at all due to the 90% Crushing blow I have on. Here's my gear:
Guillaumes Face (35% cb)
Black runeword in a flail (thul io nef, 40%CB)
Gores (15% CB)
Spirit Shield (Sacred Targe w/ 40 res all base)
Arachnid mesh belt
+1 pally skills 15 res all rare ammy
+15 res all ring
The only uber that I had a problem with at first was mephisto's elemental damage but once I used Salvation aura I was able to stay alive. The other 2 ubers are a joke even with all the minions around when lifetap is cast and fanatacism is on.
So in short, you can potentially replace some items like draculs or exile that give lifetap and maybe replace them with a higher resists shield or a pair of crafted blood gloves for more crushing blow. Cb works like static field in that it deals 12.5% of their life with each successful hit regardless of how much damage you do, which is nice
A resists amulet with teleport charges is quite nifty if you can hold of one and I'd swap one of the ravenfrosts for a dwarfstar or wisp projector for the absorbs. Stuff your stash full (-1 square)with cheap vita charms and resists if necessary.