Product Description
MAHLE CS4961 is the lower “conversion” gasket set for the 1989–1998 Cummins 3.9L 4BT (B-Series). It includes the core gaskets and seals required to service the lower end of the engine (oil pan, front cover, rear main housing, water/oil passages). Built to OE specs for long-term sealing performance.
- Engine: Cummins 3.9L 4BT (B-Series, 4B3.9)
- Set type: Lower/Conversion (bottom-end) gasket set
- Materials: OE-equivalent MAHLE® sealing materials
- UPC/GTIN: 725975582305
- OE Cross: Cummins 3802375 (earlier supersessions: 3802019, 3802266)
- Typical contents: oil pan gasket, timing/front cover gasket(s), water pump & housing gaskets, rear main seal housing gasket, assorted seals/O-rings for lower-end service (contents may vary by ESN)
Fitment
- 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998 Cummins 3.9L 4BT (industrial, commercial, step-van/bread truck, and swap applications)
Cross Reference Numbers
- Cummins: 3802375 (primary), 3802019, 3802266
- Mahle/Clevite: CS4961
- UPC/GTIN: 725975582305
FAQ
Is CS4961 a full gasket set?
No—this is the lower (conversion) set for the bottom end. Pair with a head set (upper) to complete a full overhaul.
Will this fit my Dodge Ram?
If you have a 3.9L 4BT swap, yes; factory U.S. Ram trucks used the 5.9L 6BT. CS4961 is correct for 4BT applications across 1989–1998 model years.
What OE number does this replace?
Cummins 3802375 (common current), with earlier kits 3802019 and 3802266 noted on some engines. Check your ESN to confirm.
What’s included in the box?
Core lower-end gaskets and seals such as oil pan, timing/front cover, rear main housing, water/oil passage gaskets, and select O-rings. Exact contents can vary by engine serial number.
