This has been driving me nuts for months! Let me start by saying I'm no newb to fixing odd noises or my Xj but anytime I cruise around slowly below 15mph or so my Xj grinds and shakes like ones business. I've gone thru everything including: all u-joint, Rear axle swap, regear front end w/ new carrier, bearings, and spiders, new drive shafts, mostly new steering joints and steering box brace. All of this is stuff I've done since this problem started. About a month before it started I did a SYE conversion and everything seems fine and engages correctly, I've checked both t-case fluid and tranny fluid,both are clean and metal free. Only thing I notice is my speedo needle like to jump around a bit (+/- 3-4mph). Could it possible be a bad t-case output bearing? I noticed when I installed it that the rear tail housing bearing had some surface rust on it but not a ton to be concerned about. Is there something I may have overlooked on the SYE install? I thought maybe a tranny issue but wouldn't I notice other issues in different gears and higher speeds. Bc everything shifts fine. Any thoughts? Bc I don't mind doing a t-case tear down again or a tranny swap, but I don't like doing explorative surgery on a transmission that may be fine. Please throw in some input.