A loud buzzing or whining when the transmission is in reverse may be caused by a regulator valve in the transmission valve body. A revised valve was released that does not resonate. Careful diagnosis should be performed because other causes can create the noise.
Car Problem Reports
Dodge Ram 1500 Regulator valve may cause noise when transmission is in reverse
Dodge Ram 1500 Problem
Drive Trains Affected: 4WD, Automatic Transmission
Average Mileage: 111,500 mi (62,000 mi - 189,000 mi)
Visitor, 1996 Dodge Ram 1500, 4WD, 107,000 mi
when i put the transmission in reverse it makes a whinning rattling sound
Visitor, 1997 Dodge Ram 1500, 4WD, 88,000 mi
1997 ram 1500 4X4 318 automatic (duh) makes a weird noise when in reverse. Noise is worse when moving, a loud whirring or whining noise. Transmission has begun to slip in reverse also. Truck seems to pulsate like the motor is missing but in any forward gear it is smooth running and no shift problems. I have not tried to repair as of yet.
WHINE IN REVERSE