I have a '93. The very first mod I did was a BDS 3.5" lift. That allowed me to put 33X12 tires on it. I got 5" of lift before everything settled into place. I do get some great articulation with it.
Be careful of what other mods you do. I put a FIPK air system on the Mighty YJ. My big plan was to put a 1" body lift on it to get 35" tires on it when my current tire wear out. Unfortunately, the FIPK uses a cold air box. In order to do a 1" body lift, I will also have to space up the cold air box and install a throttle body spacer now.
I have had some breakage with the BDS leaf springs. Once, after running Yankee Boy Basin above Ouray, Colorado the shackle end busted. I had to drive to Durango to get some replacement leaf springs. Although BDS does offer a guaranteed replacement, they like to inspect the broken parts before issuing the remuneration. This happened 2 days into a week long vacation and I did not want to carry the broken ones for the rest of the vacation, so I ate the cost.
Then in Moab, I was not happy with the ride on Poison Spider Mesa so I checked and the lowest leaf spring on the driver side rear was busted in half (one good reason to carry duct tape). I ordered the replacements and will send the broken ones back soon.
As far as the shakes, that is a matter of vehicle geometry. BDS offers shims that can correct for bad pinion angles. I changed the shim from a 4 degree to a 6 degree and the shaking vibrations stopped immediately. So did a lot of u-joint changing on trails!
It's all worth it when you get to see some wonderful back country sights like this one -
However, slip yoke eliminators are a great idea no matter what. Eventually I will get a set...