One problem related to transmission noise has been reported for the 1999 Chevrolet Blazer. The most recently reported issues are listed below.
My husband's was driving his 2000 chevy Blazer (52,000 mi) out of a parking lot when he heard a bump and his transmission fell out of gear, from then on the car would not go in reverse. We spent $2,200. 00 for a new transmission. A year I am driving my 1999 Chevrolet Blazer (56,000 mi. ) up hill on a one lane, (each way) curvyroad and I hear a bang and grinding noise and, surprise, no more reverse. Coincidence - I think not. We had to get out and stop traffic to try to manually turn the car around so we could drive back forwad. Very dangerous situation.