It's probably the alternator pulley causing the sqealing. The grooves on the pulleys get worn out if it's been sqealing for awhile on a worn out belt. The teeth on the pulley get really sharp and worn down. If you put a new belt on it will just ruin it and it will be screeching again in no time.
1.8 hrs to do the belt? Just did one on our 05 at work and it took me 20 mins but I did have someone else to pull the tensioner and at least 15 mins were figuring out how it went on because the sticker was wrong on the truck.
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2004 F-350 XLT 6.0 Diesel 4X4 04/04 Build
PHP FICM & Rolled Back ECM/TCM 
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