Some vehicles may exhibit a "buzz", whining", or "moaning" like noise from the transmission when reverse gear is selected. The condition is caused by a resonance of the transmission regulator valve system. Our technicians tell us that the repair involves replacing the transmission regulator (aluminum) valve with a steel one.
Some transmissions may slip in reverse or at mid throttle. The repair involves replacing the regulator valve line pressure sleeve and plug. The reverse drum, reverse band, and rear servo assembly must also be inspected and replaced as necessary.