Not sure what exactly you mean about the TM on 98s but you never want to completely turn it off in the trans section or it will cause part throttle problems. Do you have the ability to retune the pcm and make changes to the trans?. It shouldnt have the P1811 problem with that low of mileage as they replace all solenoids during rebuilds and i am yet to see a new replacement solenoid fail in that matter of time but if there was for some reason a lot of debris in the trans then it could happen and cause valve body problems. How is the shift feel? What all is done to the car?
