anyone get a shudder when it shifts from 3-4 on a 6.7. Mine just started today. It’s worse the more throttle you give it. Only on that shift though. Tow haul or reg doesn’t change anything.

What speed/rpm and is it all the time or during regen only? Mine had a hard shudder at 65 mph during regen and it ended up being carbon buildup in the number 6 cylinder and the dealership ended up replacing all of the exhaust valves. It's very rare so, now I'm pressing for a long extended warranty. I spent a full day riding with the diesel mechanic reproducing the problem - he couldn't believe how hard it was missing. First time it happened I thought the front end was shaking. It was the motor - they're so big, the shudder literally felt like death wobble. I'll post a shot of the work.