Join Date: Apr 2009
Location: Central California
The squeal seems too overall be present, whether the truck is warm, cold, charging,
etc. Thought maybe a belt tensioner too? The belts look good, but I'm not sure if the tensioners have ever been replaced. Not sure on the alternator either. Cant remember if you can change the pulley on those or if you have to replace the whole alternator? My 7.3 alternator included a new pulley. The batteries are only about 6 months old from what I can tell, so they seem to be good. When driving/accelerating, I can kind of "tickle" the squeal and bring it on/off more or less by lightly blipping the throttle. Definitely rpm sensitive right around 2200rpm. Disappears promptly after that rpm range. Definitely a loud squeal that anyone in or near the truck can hear. Kind of a shriek sound.
Early 99 (build 04/98) F250 XLT Supercab, 7.3 PSD, 4x4, 4R100, SRW, 6637 DIY intake, 4" TB exhaust, RCD leveling kit, 05 front facelift, 05 tow mirrors, 05 body badging, 05 Dash, Body molding delete, Difuser headlight harness, 20x10 XD Diesels(black), 305/55/20's, Stainless brake lines, Updated PCM, White face gauge overlay, 2002 seats.