Clutch problems. Could be asimple as servicing the master and bleeding or you could need a new clutch. Try filling and bleeding. Look for leaks on the firewall inside the cab by the peddles. Look underneath drivers side bell housing where the slave cylinder is mounted. If no leaks service as required and bleed. If that doesn't solve the issue you may be in for a new clutch.
89YJ 2.5L TBI, AX-5, NP231 SYE, Ford 8.8, Yukon Grizzly, Tom Woods Shaft, 33" BFG T/As, 4" lift, Warn VR10000s.
AF Jeep Club Tail #184