I've been hearing a loud squeal coming from the engine compartment of my '95 GCL (usu. on engine startup), so I took some advice on here and got a Krikit belt tension gauge from NAPA Auto Parts. I tried it on the drivebelt today...60 lbs! Can you say "loose belt"?
Obviously, my estimation of a tight drivebelt was a bit off. I cranked up the tension bolt and now the Krikit reads 150 lbs....well within spec range for a used belt.
Best part is....the squeal went away.
Hurray for good tools!