Never had problems with the SC belt, but my accessory belt was walking off the alternator pulley and it turned out to be a worn out/misalligned tensioner assy.
Do you have the ESM idler pullies as well? I ask because I wore a little groove in one of mine and it was causing a belt to walk off. I went through like 4 belts before I found the problem, and everything was aligned just fine.
I have a feeling the tensioner pulley is gone it not an ESM it's just the stock one still that I will be changing out to day. The belt walked off to the blower side. Lets just say a brand new belt is now crap.
Thanks Guys
I would make sure u put the pulley on right beacause if it is on the wrong way the belt will be off just alitte bit. That would be my guess cause the first time i installed a 5% overdrive pulley i ran into the same problem and then i felt stupid haha. let me know what u find out.