K, here's the deal. 2006 X auto 4.0 about 47000 miles. I get this chirping noise only when the engine is in gear and moving at lower speed (under 20 mph). So far ive replaced the serpentine belt, idler pulley and auto tensioner. Chirp still there, I then checked all the fluids just to make sure nothing got to low on me. All good and full, no leaks, doesn't leave puddles or drips at all. Today I pulled the front drive shaft after reading a lot of the chirps usually are "sparrows" . I start it up and drive down my hill and no squeek or chirp. The second I go up the hill its back. So its not the drive shaft. Its driving me crazy no clue what it could be. Don't really want to take it to a shop, cause there is only one in town and I prefer to do my own wrenching. I thought for a while it could be a dying fan clutch putting lots of strain on the belt, its 30 degrees out though not sure if that would be it. Oh and it will not make any chirp or squeak at all when not in gear and moving. Not a single odd noise at idle or reving in park or neutral. Any thoughts?