Oil leaking from the back of a Cummins can mean a worn rear main seal, especially when the crank has a groove from years of sealing. The Mahle 67857 rear main crankshaft seal kit is built for 1989-2018 Dodge/Ram trucks with the 5.9L or 6.7L Cummins and includes a repair sleeve so you can reseal a worn journal instead of chasing the leak again.

What you get:

• Mahle rear main crankshaft seal for 1989-2018 5.9L and 6.7L Cummins
• Included wear/repair sleeve for grooved or worn crank sealing surfaces
• One-piece seal design for a clean factory-style install
• Fitment across 12-valve and 24-valve 5.9L plus 6.7L common-rail applications in that year range

Specs:

• Manufacturer part number: 67857
• Application: 1989-2018 Dodge/Ram 5.9L / 6.7L Cummins rear main crankshaft seal
• Includes: rear main seal and wear/repair sleeve
• OE / interchange references commonly listed for this kit: 3926126, 3925530, 3927683, 4897876AA, 136126

This kit is for Cummins owners fixing a rear main oil leak or resealing during clutch, transmission, or bottom-end work. If the crank surface is still in good shape with no wear groove, some shops use a non-sleeve seal instead—match the condition of your crank before you order. Verify fitment for your truck before ordering.