I was thinking of repairing the rear subframe mount rust on my W124. You could drive it as-is for awhile without worrying, but I'm bored. Would I have to drop the subframe completely or could I get in there to replace the metal where it mounts into? It's a small box section that I could easily build and mig in.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k