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: 84,500 mi (62,000 mi - 107,000 mi)
Visitor, 1996 Dodge Ram 1500, 4WD, 107,000 mi
when i put the transmission in reverse it makes a whinning rattling sound