Just installed a Metco anti slip pulley and followed this guys instructions **minus the griding off the stop tab from the idler pulley. Ordered a 1 inch longer belt from NAPA NBH-080670 and it worked like a champ.

Total time was 35 minutes

HOW TO: OEM Tensioner Mod + Adding Metco Aux Idler - Lightning Forum | LightningRodder.com