Got an 89 trooper 2.6 auto.The manual hubs are worn out and will grind when disengaged.Are these rebuildable?If they are can anyone tell me where to find an exploded diagram so I know what to call these parts?The gear that fits on the axle rides in a bushing that is completely worn away.Niether of my manuals refers to these hubs just the auto ones.I installed auto hubs in thier place but my front driveshaft spins even when in 2 wheel and they try to lock then unlock and cause a loud thumping noise.Any help would be great.Thank you