I drove it today with the transmission cold. When cold I get hard shift from 2nd -> 3rd, along with the low power in first. After a ton of googling, it seems my transmission is going into “limp mode”. This would also explain some strange numbers from the computer regarding applied horse power. Most common fix seems to be the mode selector switch. I have worked on it before to clean it. Since then I have had to re-align the shift linkage to compensate, so it is possible I didn’t get it right the first time. I am going to try and clean it out again, and see what that does. Either way, I plan on doing the diff fluid (front and back) this weekend.