hi guys i have a 99 durango 5.2L auto 4x4. it has around 120000mi. It has a strange ticking noise when i put it into reverse. It only does it really in reverse tho. I have already changed the intake gasket. and plugs and wires. Also one of the wheel bearings. waterpump, ball joints. dont think any of those had anything to do with it. It also does it regardless of if its in 2wd 4pt. 4ft. or 4lo. I can't figure this out plz help me!!!!