Belt squeal with A/C off, gone when ON???

It took 2 minutes to remove the belt. I checked all pulleys for wobble. All were tight, nothing obvious. Then I took the old belt I saved for emergency. It actually looked better than the one I took off. I had my notes from last time and the order I used with a diagram. Still took 75 minutes to put it on. Finally used duct tape to secure the belt to the pulleys. When I used my 1/2 drive with 3/4" PVC 24" pipe for leverage on the tensioner, I found the old spare belt required more room to get the belt on. Had to remove the air intake housing that the filter attaches to. The belt is significantly tighter than the one I just took off. I removed all the duct tape and put the air filter back on. Fired it up without the AC, reving the engine, no squeal. Turned on the AC and still no squeal. So I got off lucky. I can't imagine what the AC clutch and whatever plus labor would have cost.
I will pickup a new belt, this time from FORD. I think I got that belt from Napa. Will change it out in 10-20K as the old one still looked in great shape.