After doing some research it seem that I may have to re-gear my axles, as I am running the std Dana 30/35 set-up.
If I do a re-gear, will I also need to upgrade my brake system? Also, if I re-gear a Dana 30/35, they are still quite weak (or so it seems), so wouldn't be better simply get a better axle?
If so, which axles could I use on a 92 YJ...
Well you're not alone. I have a 4" lift with 5/8" booms and 33s, I don't have any issues with vibrations as I currently have a TC drop and 4* shims on the rear leafs. With the 4.0 we have 3.07 gears which really need to be 4.10s with 33s. You have a few options. I went out and picked up a nice D30 out of a 4 cyl which has 4.10 gears for $100. The guy needed to get out of his garage. I'm going to go through it and replace seals and check bearings.
For the rear I picked up a Ford 8.8 out of a 2001 Explorer with 4.10 gears. There's some fabrication work to swap in the 8.8 but well worth it and there's plenty of documentation here and online. I just rebuilt a TC but didn't do an SYE because I'm waiting until I get the 8.8 in.
As far as brakes go...yea an upgrade is probably the smart thing to do. I'm in the process of swapping in a dual diaphragm booster/MC from an 06 TJ. I have a thread documenting the swap. I'm at the point were it's ready to go in, make a couple new lines and bleed the system. Hopefully I get it done before the weekend.
X2 with TheNewbie...The steering wheel vibration is usually due to improperly balanced tires, bad wheel bearings, ball joints and tie rod/drag link ends. Did you have and vibration/shaking in the steering wheel before you put the 33" tires on?
Owning a "Renegade" means being "Different"!