In my 86 trooper. Every time I let off the gas and press down again I get a jarring like the joints are loose and it is taking up the slack in them. I checked them all and they all seem to be tight and greased. Is this a common problem with 86 troopers or something I shoudl worry about possibly in the diff case itself??

thanks

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