Viabration

first and foremost, I would have a really excellent transmission tech verify your diagnosis. And, yes, if the converter is defective, it is sending vibrations all through your drive train, so that is never a good thing. You can get the cost from the trans tech, because it may just need to be re-balanced, rather than replaced. I used to re-build transmission in dealerships and I use to re-balance converters.

Sounds very likely your transmission is gone. The transmission problem is very common among model 91-93. The 94 and later model have redesigned transmission but the simular problems still exist. A lot of people have had accident and complained but Honda denied all resposiblilty. You can do some research about the MDX transmission problems online. I am also one of the MDX's transmission victims. Good luck with your transmission.

Just picked up my 2005 MDX from dealer after replacing the torque converter. It appears that the vibration/grinding between 35-40 mph has now been eliminated. For background, I reported this problem in March 2009, a couple of months prior to the expiration of my warranty. The service tech stated that he/she could not reproduce the noise I was hearing. Over a year later, the noise was now continuous. I took the vehicle in and this time the service tech could hear the noise. I was told that the vehicle was out of warranty (45,000 miles, but over 60 months) and that it would cost $2,000 to $3,000 to fix the problem. I opened up a case file with Honda America. After several calls, I was offered a repair for $500. I continued to complain and mentioned that I had uncovered over 100 complaints for the exact same issue. The Honda rep. still would not budge on the $500 cost to me. Finally, I mentioned that I might pursue a "class action suit". He said he would speak to the district supervisor. Miraculously, he came back and said that Honda America could cover 100% of the repair. I would suggest that anyone battling this issue out with Honda America mention "class action suit". There attitude seems to change quite significantly! Good luck!