One problem related to transmission noise has been reported for the 2004 Toyota Camry. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Toyota Camry based on all problems reported for the 2004 Camry.
On my 2004 Toyota Camry le, at the exact moment I applied the brakes at idle speed, there was an extremely loud and high revolution racing sound. This condition was extreme. I changed gear selector from "drive" to "park" and there was no change in racing sound or noise level. However, car did not surge forward and no additional brake pressure was required. I turned engine off and car restarted normally. A mechanic checked out my car and found nothing wrong. A similar incident occurred about 2-3 months earlier while backing up at idle speed. Not sure if it is possible for engine to disengage from transmission, which might explain why car did not surge forward (and backward respectively). This same car in March of 2010 experienced unintended acceleration (parked under a cell tower) which was much worse than described above-I filed a complaint in 2010 for this.