Well, Its the diff.
I pull well over 10,000 pounds with it through mountains etc. The forces on the center section I can only imagine are immense. I'd not want it to come apart when I am whizzing down the road with a load....you know, on a mountain...yikes! (Cue Harry Chapin's 30,000# of banannas)
I'd patch the sheet metal cover in a heartbeat but the center section is all this massive forged iron looking thing which makes no sense to be coming apart at all. I have lost all confidence in it.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.

[SIGPIC]
..I also have a 427 Cobra replica with an aluminum chassis.