Do you know what it is made of? I'm wondering if it might be molded PVC. If it is, and you try to lay up a fiberglass repair, it will eventually debond. If it is PVC, you might be able to fix kinda easy with some flat PVC stock, corner gusset, and PVC solvent glue. Just got to plug that hole, yes?
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1996 Rexhall xl3400
Ford 460
Tag axle
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