I have a 2014, 6.7 TD with 114k on it. Tuner, DEF delete, straight piped. 2nd owner. 1st owner did all that.

When I bought it is 2017 with 204k on it, I took it to PDP in Lancaster SC to have all checked out. He noted the transmission had been worked on. Don’t know if it was a rebuild or what. I did a complete oil, transmission and all filters change.

Have had no problems but one thing bugs me.

Occasionally the tranny will down shift rather hard. It is not consistent and I can’t isolate why or don’t know if this is normal.

It is normally in 3rd I think downshifting to 2nd but not sure. Always catches me off guard.

Any thoughts?