No tag. You have two options, first one is hope the RPO code sticker in the glove box is still legible, looking for something like GU6 = 3:42, GT4 = 3:73, GT5 = 4:10, etc, G80 denotes a locker. Second on the passenger axle tube facing the front of the truck is a three digit code stamped into the axle tube generally followed by a space and a longer set of number or letters. Post either one here and I can decode them for you.
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