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I had a similar problem, my 04 6.0 R4LE(?) wouldn't go above 70mph in OD, but would go 80 in third. I exhausted ( ) all other possibilities then cut the pipe in front of the third, unmonitored cat. Which is why no CEL. It would easily go 80 in OD. BTW, I got $175 for my old cat.
I just went through this and the symptoms were as described by others..Zero power and any sort of incline would almost stop the jeep
I took a rubber mallet and smacked the converter and could hear crap falling and bouncing around
I may have accidentally cut an inspection hole in the converter body, removed the honeycomb that had fallen to the bottom and retested.
Is there any method to assure that my cat is clogged when there is no cel?