2000 996 Transmission Vibration

[wcrosby]

I have a high mileage 2000 996 which has recently had a new torque converter installed. This installation was done to cure a nasty vibration was was diagnosed by Black Forrest as the need for a replacement torque converter. This was done and significant positive results were accomplished. However, I continue to have vibration problems when the care in still and in neutral. Anything above 1400 RPM, the vibration is felt. This is being re-researched by Black Forrest. Any suggestions on what may be causing this? I realize the age of the car an wear and tear are probably the greatist issues. What I'm looking for is a diagnoses and a cure. I've tried Rennlist with no success. Thanks.