Hi all. Since I have put a set of 342 rear gear into my 99 A4 c5 corvette I have had problems, like yesterday tranny was shifting like butter, then I heard it start to slip in 4th gear. This has happened before but this time the check engine light came on and throwing a 10-PCM-1870 code, which means slippage. Got home after going through the diagnostics, I reset the code, and after that shifted smooth as butter again. I have had shift points done twice already, so I'm thinking maybe the valve body or the shift pressure solenoid, or both. After the check engine light came on it shifted really hard from 1st to 2nd. It was most likely locked. Anybody got any ideas or have gone through the same ordeal. Any input would be appreciated. Frustrating as Hell.