5346429 Oil pump for Cummins 4BT Replace No. 4939585

The Cummins oil pump #5346429 (replacing older part #4939585) is designed for the Cummins 4BT engine, a 3.9L inline-four diesel commonly used in industrial, agricultural, and small commercial applications. Here’s what you need to know about compatibility with Dodge Ram trucks:

1. Does This Fit a Dodge Ram?

❌ No – The 4BT engine was never factory-installed in Dodge Ram trucks.
✅ Fits:

• Cummins 4BT (3.9L) engines in:

  • Bobcats, backhoes, generators

  • Older buses, marine, and industrial equipment

  • Some aftermarket swaps (rare in Rams)

2. Dodge Ram Oil Pump Options

If you need an oil pump for a Dodge Ram Cummins, use these instead:

• 5.9L Cummins (ISB, 1998.5–2007):

  • OEM #4022947 (standard)

• 6.7L Cummins (ISB, 2007.5–present):

  • OEM #4026250 (early 6.7L)

  • OEM #68516778 (2019+ updated design)

3. Key Notes on 5346429 (4BT Pump)

• Gear-driven (not chain-driven like ISB 5.9L/6.7L).

• Industrial use – Higher durability but not optimized for truck performance.

• Not interchangeable with 5.9L/6.7L Rams due to different mounting and pressure specs.

4. How to Verify Your Engine

1. Check engine serial number on Cummins Quickserve.

2. Match oil pump specs:

   • 4BT: ~45-65 PSI

   • 5.9L/6.7L: ~50-80 PSI (varies by year).

Final Verdict:

• #5346429 is for 4BT engines only – not compatible with Dodge Ram 5.9L/6.7L Cummins.

• Need a Ram Cummins pump? Use #4022947 (5.9L) or #4026250 (6.7L).

Let me know if you need help finding the correct pump for your truck!