Well, got the truck back. Drove it home, popped the hood and found this.


after talking with the shop they had no misalignment issues, but that’s not what I’m seeing. Any suggestions on where to start?

 

I see a new SC pulley, one idler and tensioner. The belt looks new on the rib side but the flat side looks worn. I would check both the idlers for trueness. The new one may not be sitting square with the bracket or the old one may be going out. Also check where the tensioner is in its range with that belt. I like to park them 2/3-3/4 travel on the tight side.

 

Both the pulleys under the sc pulley are idlers.
the far pulley on the left is the tensioner. It’s got about a 1/4 turn before it’s fully out.

 

Hard to tell in images but agreeing with BigKID on inspection of tensioner range of travel and condition.

Other than this, I would pull the belt off and hand check everything for wear, noise, wobble, and string line or straight edge everything in reference to the crank pulley.
Could be as simple as the wrong, missing, or reversed washer behind a pulley.

As far as going by a photo which some viewers may interpret, here is mine which makes the alternator idler look outward. It is not. Back story is I had belt slippage squeal when letting off throttle abruptly while in playtime. I went with the larger idler pulleys before and after the blower.

Looking forward to hearing of the simple fix.

 

Need an HD tensioner and a tiny bit shorter gates green belt. The shorter belt reduces the amount of travel the tensioner has.

 

I will say. The supercharger and the pulley/tensioner that came in the kit have maybe 100 miles on them. When I was on the stock sc pulley the alignment was just fine, no issues.