as for example which tranny you have. I have it under my favourites. Just type in the last 7 letters/numbers of your VIN (chassis number) and you will get interesting data on your car. Among others what month/year produced, engine type, trans type etc.
There are many VIN decoders online like on my page, on Johan & Sean's page under miscelanoeus links.
Have you tried to change the trans mounts? I have changed engine and trans mounts some weeks ago and the car now runs remarkably smooth. Just one of many possibilities of your prob.
Used trans or remanufactured are of course available.

for example here

and of course the famous

Full Name: Kirt Koeller
Job Title: ZF Transmission Expert
Company: Auto Sports Unlimited

Business: (800) 624-3876 ex 5735
Business 2: (616) 748-5735

E-mail: europetransman@hotmail.com