Slips In 4th Gear
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 1996 Dodge Ram Wagon, 1996 Dodge Ram Van, 1996 Dodge Pickup, 1996 Dodge Dakota, and 1996 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
Check for defective overdrive clutch, overdrive clutch piston or seal, defective thrust bearing, defective 3-4 shift valve, timing valve or accumulator, low fluid level, overdrive piston retainer bleed orifice defective.