One problem related to noises during shifting has been reported for the 1999 Chevrolet Blazer. The most recently reported issues are listed below.
Automatic transmission failed at 49,026 miles. While driving and applying pressure to the accelerator pedal, there is an audible sound of a gear "free wheeling". The transmission hesitates to shift gears when traveling forward. Although the gear shift level can be placed into reverse, the vehicle will not move in reverse. Lindsay Chevrolet (dealer where I purchased the vehicle 3 years, 2-1/2 months ago) conducted a preliminary diagnosis that involved no computer check, but based on the evident noise and performance of the transmission recommended replacement of the transmission. Beginning at 28,805 miles, this vehicle also experienced a recurring oil leak from the lower oil line/oil line adapter that took the dealer four attempts over four months to identify and repair. The right hub assembly also burned out at 38,190 miles. Ts.