Tranny shifts from 2nd gear to Overdrive?!?!?

[atrainbynight]

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.

[Trannyman95]

If you dont have any solenoid codes then you likely either have badly burnt 3rd clutches or a bad 3rd sprag assembly. This will give you 1-2-4 and no 3rd gear. It is not very common to see but I have seen this a handful of times and if this is the case it means rebuild to repair it. Have you tried manually shifting 1-2-3-4? You can also unplug the case connector and when you do this it will leave the transmission taking off in 3rd gear unless you pull it down into 2 or 1 ranges and in those two ranges you will have 2nd gear. If you only have 2nd gear regardless in this state then you have a mechanical problem such as damaged clutches or a bad sprag.