Product Description
Cummins 3936256 — Genuine Timing Gear Case Housing
MPN: 3936256 | Also Known As: gear housing, timing case housing, front gear case
Restore factory alignment and sealing at the front of your B-series. The genuine Cummins 3936256 timing gear case housing is a direct-fit OE replacement for 1994–1998 Ram 2500/3500 5.9L 12-valve (P7100). Built to Cummins specs for flange flatness, geartrain clearance, and long-term durability.
Features & Benefits
- OE geometry for correct gear mesh and front accessory alignment.
- Direct-fit housing for ’94–’98 5.9L 12V P-pump applications.
- Improves sealing when paired with new housing gasket and front crank seal.
- Durable casting to resist cracking and warping.
- Genuine Cummins quality and fitment.
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1994–1998 | 5.9L 12V (P7100) | Ram 2500/3500 |
Industrial/Off-Highway: Cummins lists 3936256 as a Gear Housing used primarily on Euro 2 / B-series 5.9L engines—verify by ESN for non-automotive equipment.
Compatibility Notes:
- 1989–1993 VE and 1998.5–2002 24V (VP44) use different housings. Some P7100 conversion builds use this housing—verify your parts list.
- Always install with a new housing gasket and front crank seal to prevent leaks.
Specifications
- Type: Timing gear case / front gear housing
- OE Part Number: 3936256
- Material: OE-grade cast housing
- Quantity Required: 1 per engine
Often Paired With
- Gear housing gasket: Cummins 3938156 (B-series housing-to-block seal)
- Front crankshaft seal kit: Cummins 3937111 (’89–’07 5.9L; includes installer)
- Killer Dowel Pin (KDP) repair kit: recommended on 12-valve builds during housing service
What’s In The Box
- (1) Genuine Cummins Timing Gear Case Housing (3936256)
- Gaskets/seals sold separately (see “Often Paired With”).
Installation Tips
- Thoroughly clean block and housing surfaces; dry fit to confirm dowel alignment.
- Use a new housing gasket (3938156) and apply sealant only where Cummins specifies.
- Install a new front crank seal (3937111); verify crank hub/balancer torque.
- After first warm-up, recheck for seepage at corners and around the crank seal.
FAQ
WILL THIS FIT MY 1994–1998 12-VALVE RAM?
Yes—3936256 is the OE timing gear case housing for 1994–1998 Ram 2500/3500 5.9L 12-valve (P7100).
DOES THIS INCLUDE THE GASKET AND FRONT SEAL?
No—order gasket 3938156 and front crank seal kit 3937111 separately for a leak-free install.
DOES THIS FIT 1989–1993 OR 1998.5–2002 24-VALVE?
Not directly. Those engines use different housings. Some P-pump conversion builds may use 3936256—verify your conversion kit.
SHOULD I DO THE “KDP” FIX WHILE I’M HERE?
It’s smart insurance on 12-valve engines. A KDP (Killer Dowel Pin) repair kit prevents a locating pin from backing out and damaging the geartrain.
IS THIS A GENUINE CUMMINS PART?
Yes—OE Cummins 3936256.
