Underdrive Piston – Mopar (4799652)

Underdrive Piston is one of the pistons that converts combustion pressure into motion. Ring land dimensions and skirt coating are specific to the build, not to the displacement.

Replace the Underdrive Piston during any rebuild that has the head off, and always when the bore shows vertical scoring. Piston-to-wall clearance is set by measurement, not by the part number alone.

This Underdrive Piston is listed under part number 4799652, filed under Pistons, Rings & Cylinders. If the original number is unreadable, send us the VIN and we will confirm the reference before dispatch.

This is MOPAR dealer-sourced stock rather than an equivalent, so the number on the Underdrive Piston traces straight back to the manufacturer.