Transmission Noise problems of the 1999 Acura CL

There is a transmission problem with Acura 1999 2. 3cl. A heavy rattling noise comes when I drive the car 20-30 mph or when I try to accelerate from halt. The noise is sometimes so heavy and frightening, that I had to pull over my car on the shoulder for atleast 6-8 times. I went to the dealer, asking to repair, but he said that this is a problem with all 4cyl engines of that year.