This bulletin applies to 2012 Dodge Ram 1500 trucks equipped with the 5.7L engine. A whine, howl and/or humming noise at speeds below 30 mph and with engine speed between 1200 – 1500 rpm may be heard. This applies to vehicles built before May 10, 2013.
The transmission pump may emit this noise.
The cure involves installing an insulating package onto the transmission cooler lines.
Install one foam sleeve (from kit P/N 68217310AA) on each cooler line between the metal crimp fittings. Ensure that the foam slit is facing downward.
Secure the foam sleeves with tie straps. Tighten the tie straps just enough to secure the sleeves in place.