You could also try shimming the rear to correct the pinion angle. With my OME suspension I went ahead and did the SYE, the slip yoke is a bad design anyway for on the trail... i have no vibration. 2.5" OME with 1" shackles, SYE, ADAMS DS, no t-case drop, or shims.Just finished up t-case drop in the attempt to get rid of the post-lift-installation vibration. Well, let's put it this way - it substantially downsized it but didn't take care of it completely. Here is what I did. I have RC 2.5" SL, +1" boomerang shackles, 1" Daystar t-case drop, and brand-spanking-new u-joints on the rear drive shaft. It still gets sizable vibration at up to 20 mph and then gradually goes down till it becomes as lows as engine, road noise, etc. To my understanding before I go SYE/CV-shaft combo my last resort would be to try rebalance the driveshaft. If that doesn't work then I'll go with the SYE combo. True example of "... each Wrangler is different in its own way."