Transmission noise when reverse is selected on Dodge Ram Van 3500

Problem Description and Possible Solution
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.
Problem Data
RepairPal Verified
Average mileage: 101,000 (101,000–101,000)
Drive Train affected: Automatic Transmission
3 model years affected: 1995, 1996, 1997
4 people reported this problem
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moaning in reverse before warmup.