truck squeaking in back of engine when out of gear in idle

Cam sensor synchronizers are known to fail in these vehicles,causing a squeek squeek squeek noise.The synchronizer bushings wear out causing this sound and as a result will take out the cam sensor that sits on top of the synchro,always replace in pairs.

Does noise change with clutch depressed? If not, answer 1 is most likely suspect! Mechanic needs to change cam sensor as it has to be synchronized with engine, if that is the problem! Replace the unit not just the sensor. Check the diff. vent hose and check valve may need to replace or reposition. ......Own a boat?

agree with #1 and #2. the cam sensors assm are sold at napa for approx 70.00.