Have a 2000 GTP with 108,000 miles. Tranny was acting up and I had a code of a stuck open solenoid, so my father and I replaced all the solenoids. Seemed to fix the problem and the tranny shifted smooth threw every gear. Then all of a sudden it would not engage into 3rd gear, would go from 2nd to OD. Kicks into 2nd at about 17-18mph....then nothing til about 43-45mph where it kicks into OD. Put a bottle of Lucas stop slip in the tranny and thats where we are now. Anyone have a similar problem and get it fixed or have any suggestions on what to try next? Thanks in advance.