Product Description
The CUMMINS 5259499 OEM REAR MAIN CRANKSHAFT SEAL is designed for 1989–2018 Dodge Ram and Ram trucks equipped with 5.9L and 6.7L Cummins diesel engines. This genuine Cummins rear main seal helps prevent engine oil leaks at the rear of the crankshaft while maintaining OEM sealing performance and durability.
Use this part when repairing rear main seal leaks, performing clutch service, replacing a transmission, or rebuilding a Cummins engine. Always verify fitment by engine serial number before ordering.
FEATURES
- Genuine Cummins OEM rear main crankshaft seal
- Direct-fit replacement for factory rear crankshaft sealing applications
- Helps prevent engine oil leaks at the rear of the engine block
- Designed for long service life and dependable sealing performance
- Ideal for maintenance, repair, transmission service, or engine rebuilds
FITMENT
- 1989–1998 Dodge Ram 2500/3500 5.9L Cummins 12-Valve
- 1998.5–2002 Dodge Ram 2500/3500 5.9L Cummins 24-Valve
- 2003–2007 Dodge Ram 2500/3500 5.9L Cummins Common Rail
- 2007.5–2018 Ram 2500/3500 6.7L Cummins
- Select Cummins industrial and commercial applications
WHAT'S INCLUDED
- 1 Cummins 5259499 OEM Rear Main Crankshaft Seal
CROSS-REFERENCE AND RELATED PRODUCTS
- Cummins 5259499
- Rear Main Seal Housing Gaskets
- Oil Pan Gaskets
- Flywheel and Flexplate Hardware
SPECIFICATIONS
- Manufacturer: Cummins
- Part Number: 5259499
- Part Type: Rear Main Crankshaft Seal
- Engine Compatibility: 5.9L Cummins, 6.7L Cummins
- Fitment Years: 1989–2018
- Vehicle Application: Dodge Ram / Ram 2500 and 3500
- Seal Location: Rear Crankshaft
- Condition: New OEM Cummins
- Installation Type: Direct Replacement
FAQ
Will this rear main seal fit my truck?
This seal fits many 1989–2018 5.9L and 6.7L Cummins applications. Always verify fitment using your engine serial number before ordering.
Is this a genuine Cummins seal?
Yes. Cummins 5259499 is a genuine OEM rear main crankshaft seal manufactured to Cummins specifications.
What are the symptoms of a leaking rear main seal?
Common symptoms include engine oil dripping from the rear of the oil pan, oil contamination on the flywheel or flexplate area, and visible oil leaks between the engine and transmission.
Should I replace the rear main seal during clutch or transmission service?
Yes. Since access requires transmission removal, replacing the rear main seal during clutch, flywheel, or transmission service is often recommended.
What is included with this part?
This listing includes one genuine Cummins 5259499 rear main crankshaft seal.
Do I need any related parts?
Inspect the rear seal housing, oil pan gasket, flywheel or flexplate hardware, and related sealing surfaces during installation and replace worn components as necessary.
