If the transmission delays initial gear engagement after being parked overnight or longer, it may be due to a suspect transmission cooler return filter. If the transmission was recently serviced and the part number for the cooler return filter contains an "AB" suffix at the end, a new filter should be installed.Google+
Car Problem Reports
Dodge Ram 3500 Replace Transmission Cooler Return Filter if it Has "AB" Suffix At End
Dodge Ram 3500 Problem
Drive Trains Affected: 2WD, 4WD
After sitting overnight transmission slow to shift into drive, if I shift
to reverse and then back to drive it works okay.
Visitor, 2001 Dodge Ram 3500, 4WD
Transmission will not engauge if left over night till warmed up then will run fine.