Don't be &quot;That Guy&quot;
Join Date: Jun 2006
Location: Marysville O - H - I - O
Vehicle: 98 Dakota Clubcab 7.2L
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loads up only on acceleration? that's odd. could be additional load on the electrical system putting an extra load on the alternator making the belt squeel...but that's not likely.
beats the hell out of me why it only happens on acceleration, other than your putting effort into spinning all the accessories faster, which loads up the entire belt system, and makes a squeel, and as you coast/brake, it's all just "coasting" back down.
regardless, check your belt, make sure it's not glazed over from excessive heat/age. if it's got 70K miles or more on it, or it's more than 5 years old, change it.
if it's still there, check your tensioner, make sure it's still pulling the belt tight.
While you have the belt off, feel all the pulleys, make sure none of them are "dry" when you spin it by hand, it should have no wobble in it, and it should feel "gummy" for lack of a better term. basically, if you spin it by hand, it should only spin over 2, maybe 3 times before stopping. this means there's still good grease in the bearings.
if you spin it and it just goes and goes and goes, then the bearings are dry, and shot...and needs replaced.