CUMMINS 3936256 OEM TIMING GEAR CASE HOUSING – 5.9L 12V (1994–1998)

CUMMINS 3936256 OEM TIMING GEAR CASE HOUSING – 5.9L 12V (1994–1998)

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The Cummins 3936256 OEM timing gear case housing is the genuine inner gear housing that supports and aligns the front geartrain on your 1994–1998 Ram 2500/3500 5.9L 12-valve with the Bosch P7100 injection pump. Built to Cummins specifications for flange flatness, gear clearance, and sealing, this housing is the right choice when repairing killer dowel pin (KDP) damage, fixing leaks, or doing a full front-of-engine refresh.

Fitment

• Engine: 5.9L 12-Valve Cummins (6BT), Bosch P7100 injection pump
• Vehicle: Dodge Ram 2500 / 3500 (2nd Gen)
• Model Years: 1994, 1995, 1996, 1997, 1998
• Configuration: Inner timing gear case / gear housing (behind front cover)
• Industrial / Off-Highway: Used primarily on B-Series 5.9L Euro 2 engines and related ISB/QSB variants — always verify by ESN.

Note: 1989–1993 VE-pump and 1998.5–2002 24-valve (VP44) engines use different housings. Some P-pump conversion kits for VE or VP44 engines are designed around this 3936256 housing — always confirm against your specific conversion parts list before ordering.

Features & Benefits

• OE geometry: Maintains correct gear mesh and front accessory alignment for long geartrain life.
• Direct-fit housing: Designed for 1994–1998 5.9L 12V Cummins with the Bosch P7100 (“P-pump”).
• Improved sealing: Works with a new housing gasket and front crank seal to stop persistent front leaks.
• Durable casting: Genuine Cummins casting engineered to resist cracking, distortion, and fretting.
• KDP repair friendly: Ideal foundation when correcting killer dowel pin failures or installing a KDP repair kit.

Cross-Reference & Related Cummins Parts

Cummins cross-reference part numbers (gear housing family):

• 3918180 – Gear housing (earlier equivalent, 4BT/6BT applications)
• 3920519 – Gear housing (B-Series variant)
• 5267783 – Later superseding gear housing in some catalogs

Related genuine Cummins parts available at CPP Diesel:

• Gear housing gasket: CUMMINS 3938156 OEM TIMING GEAR HOUSING GASKET – 5.9L 12V/24V (1989–2002)
• Front crankshaft seal kit: CUMMINS 3937111 OEM FRONT CRANKSHAFT SEAL SERVICE KIT – 5.9L CUMMINS (1989–2007)
• Timing pin: CUMMINS 3903924 OEM TIMING PIN – 5.9L 12-VALVE (1989–1998)
• Timing pin housing bolt: CUMMINS 3907998 OEM TIMING PIN HOUSING BOLT – 5.9L 12-VALVE (1989–1998)
• P7100 pump-to-timing-case O-ring: CUMMINS 3969698 OEM P7100 PUMP-TO-TIMING CASE O-RING SEAL – 5.9L 12V (1994–1998)
• Front timing gear cover: CUMMINS 3923898 OEM FRONT TIMING GEAR COVER – 5.9L (1994–2002)

What’s In The Box

• (1) Genuine Cummins timing gear case housing – Part # 3936256

Gaskets, seals, bolts, dowel pin, and front cover are sold separately. Pair this housing with a new gasket (3938156), front crank seal kit (3937111), and a quality KDP repair solution for a long-term repair.

Installation Tips

• Thoroughly clean the engine block and new housing mating surfaces; remove all old gasket and sealant.
• Dry-fit the housing on the block to verify dowel alignment before applying sealant or installing the gasket.
• Use a new gear housing gasket (3938156) and follow Cummins sealant callouts at corners and joints only.
• Install a fresh front crankshaft seal kit (3937111) and verify crank hub / damper torque.
• Check gear backlash and rotation after installation; there should be no binding or abnormal noise.
• After first heat cycle, inspect the perimeter for oil seepage and re-check front seal area.

Specifications for cummins 3936256

Frequently Asked Questions

Yes. Part number 3936256 is the OE inner timing gear case housing for most 1994–1998 Dodge Ram 2500/3500 trucks equipped with the 5.9L 12-valve Cummins and Bosch P7100 injection pump. Always verify by VIN/ESN if your engine has been swapped or modified.

No. This listing is for the bare gear housing only. We strongly recommend adding a new gear housing gasket ( Cummins 3938156) and a front crankshaft seal kit ( Cummins 3937111) along with any other worn timing components.

Not directly. VE-pump 12-valve (1989–1993) and VP44-equipped 24-valve (1998.5–2002) engines use different housings. Some P7100 conversion kits use the 3936256 housing as part of the swap, but you must confirm fitment with your conversion kit instructions and hardware list.

Yes, this is the ideal time to address the Killer Dowel Pin. A loose dowel pin can damage the timing gear case and gears. With the housing off, install a quality KDP repair kit and verify all dowels are secure before reassembly.

This listing is for a genuine Cummins 3936256 timing gear case housing sourced through CPP Diesel. Genuine Cummins components provide OE geometry, material quality, and traceability for long-term reliability.