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i figure if the OP wants it fixed, he can post some pics of the setup he has....from my experience with shredding belts on a serp truck with Red dot AC, it’s been alignment issues....

The SN range makes it a Cast serp system....thus you can only use pancake compressor. The cast serp setup already allows for the addition or subtraction of a compressor via the delete pulley that goes on AC bracket. And the OP makes no statement of AC in the truck....

Well, then I’m wrong...the TM is wrong. But that’s not the case....check the TM, your SN is above 196xxx https://www.hummerpartsguy.com/search.asp?keyword=20-9646&search=

There are 2 lengths, it’s based on your serial number range....or basically what version of serp setup you have. but I can tell you there is no 126in....it’s 98 or 114in.

Wrong belt and too tight?