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I've never seen the mid-shaft bearing go out on one of these, I'll keep my eyes open for these now.
On the cats, I've only replaced noisy ones (where the matrix inside the cat has loosened up, it makes a rattling noise) and also I replaced one where one of the welds that holds the outer shell together actually cracked all the way aroundf the circumference of the shell. I would tend to believe this may happen if the cat is very hot (such as during a fast highway trip) and then the truck either is driven through a cold rain puddle or maybe taken through a car wash that has a chassis flush feature.
Then again, maybe it was just a crappy weld job.
I've never had a plugged cat, but then again, we've only replaced one ML engine due to high oil consumption.
Gilly
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