Product Description
CUMMINS 4938948 OEM CRANKSHAFT THRUST BEARING FOR 1989-2018 5.9L AND 6.7L CUMMINS
The Cummins 4938948 OEM crankshaft thrust bearing is a genuine factory thrust washer designed to control crankshaft endplay in 1989-2018 5.9L and 6.7L Cummins B-Series and ISB engines.
Excessive thrust bearing wear may lead to crankshaft movement, torque converter misalignment, transmission damage, and premature main bearing failure. Genuine Cummins thrust bearings are engineered with the correct material hardness, oiling characteristics, and tolerances required for long-term reliability.
This OEM thrust bearing is ideal for stock rebuilds, towing applications, engine overhauls, and high-performance Cummins builds.
FEATURES
- Genuine OEM Cummins thrust bearing
- Controls crankshaft endplay
- Designed for 5.9L and 6.7L Cummins engines
- Helps prevent excessive crankshaft movement
- Supports proper transmission alignment
- OE material hardness and oiling design
- Ideal for engine rebuilds and overhauls
FITMENT
- 1989-1998 Dodge Ram 2500 and 3500 5.9L 12-valve Cummins
- 1998.5-2002 Dodge Ram 2500 and 3500 5.9L 24-valve ISB Cummins
- 2003-2007 Dodge Ram 2500 and 3500 5.9L Common Rail Cummins
- 2007.5-2018 Ram 2500 and 3500 6.7L Cummins ISB
- Select industrial and agricultural B-Series Cummins engines
Fitment Note: Always verify thrust bearing width and engine serial number before installation.
WHAT'S INCLUDED
- 1 Cummins 4938948 OEM crankshaft thrust bearing
RELATED PARTS
- Cummins valve stem guides
- Cummins tappet cover seals
- Cummins main bearing sets
- Cummins crankshaft seals
- Cummins engine rebuild kits
INSTALLATION NOTES
- Measure crankshaft endplay during installation
- Inspect crankshaft thrust surfaces for wear
- Lubricate bearing surfaces during assembly
- Follow Cummins service specifications and procedures
- Replace thrust bearings during major engine rebuilds
SPECIFICATIONS
- Brand: Cummins Genuine Parts
- Part Number: 4938948
- Component Type: Crankshaft thrust bearing
- Engine Compatibility: 5.9L and 6.7L Cummins B-Series and ISB
- Fitment Years: 1989-2018
- Application: Crankshaft endplay control
- Shipping Weight: Approximately 0.15 pound
- Package Dimensions: Approximately 2 inch x 2 inch x 1 inch
- Condition: New genuine Cummins OEM part
FAQ
What does the Cummins 4938948 thrust bearing do?
This thrust bearing limits crankshaft endplay and helps prevent forward and backward crankshaft movement that may damage engine and transmission components.
Is this thrust bearing used on both 5.9L and 6.7L Cummins engines?
Yes. Cummins 4938948 is used on many 1989-2018 B-Series and ISB Cummins engine applications.
Should thrust bearings be replaced during an engine rebuild?
Yes. Replacing thrust bearings during engine rebuilds is strongly recommended whenever the crankshaft is removed or excessive endplay is detected.
Can excessive thrust wear cause transmission problems?
Yes. Excessive crankshaft movement can affect torque converter alignment and may contribute to transmission damage.
Do I need to measure crankshaft endplay after installation?
Yes. Proper crankshaft endplay measurement and verification are required during engine assembly.
