Alright. This weekend I crawled under there. Tightened all the axle bolts(none were loose) Changed the rear diff fluid and tranny fluid.(dirty but full) greased all the places I could grease underneath. And checked for play in the shafts (very little)

THen I took it off the blocks and sure enough the majority of the jarring went away. Now it only does it if I lay off and then jam the accelerator which happens on any vehicle.

thanks

Lucas

86 Trooper II
Stock except for the Rust and dents that came with it. Restoration while being a daily Driver is in progress. Completed so Far-Front Brakes, Rear Brakes, Frame restoration, 1 1/2" lift shackles, custom front and rear bumpers