Just jacked each wheel up and the two fronts while in Diff lock dont free wheel. But the Rear 2 wheels do! They spin and spin.. Suggestions as to what i need to replace. Thanks

Hi there, Im new to the Landy Scene and need a little Help. I recently bort myself an off road ready 1992 90.. Went off Roading (Nothing Major) and after using the diff lock in Low Range and high Range (Stick over to the Left) It now wont engauge normal Driving with the locks off.. Can anyone...