3937404 is the part number of the lubricating oil pump produced by Cummins. It is a critical component of the engine lubrication system, primarily used to ensure that oil circulates under pressure and is delivered to moving parts such as bearings, pistons, and camshafts.

Applicable to engine series: mainly dedicated to Cummins B-series engines, including 4BT (3.9L) and 6BT (5.9L) diesel engines.

Suitable for classic models: Widely used in Dodge Ram 2500/3500 5.9L 12 valve (12V) and 24 valve (24V) diesel pickups from 1989 to 2002.

In the aftermarket or upgrade, this oil pump is often interchangeable with part numbers 4939587, 5346430, 3930337, and 141299 produced by PAI