Transfer case Dodge Ram gen 4
inventory at Buy Mustang parts Ltd, the fourth-generation (Gen 4 / DS/DJ) Dodge Ram transfer cases represent a major shift in technology. This era (2009–2018) moved away from the older New Process/New Venture units toward BorgWarner assemblies.
To maximize your resale value, you must distinguish between the “On-Demand” and “Part-Time” units, as they are not cross-compatible.
1. Ram 1500 (Half-Ton) Models
The 1500 series uses two primary BorgWarner units. The easiest way to identify them is by the buttons on the truck’s dashboard.
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BorgWarner 44-44 (On-Demand):
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Identification: Look for a “4WD AUTO” button on the dash.
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How it works: Uses an internal clutch pack to automatically send power to the front wheels when it senses slip.
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Value: High demand for luxury trims (Laramie, Longhorn, Limited).
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BorgWarner 44-45 (Part-Time):
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Identification: Only has 2WD, 4WD High, and 4WD Low (No “Auto” setting).
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How it works: A traditional mechanical lock-up.
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Value: Preferred by off-road enthusiasts and “Tradesman” trim buyers for its simplicity and durability.
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2. Ram 2500/3500 (Heavy Duty) Models
The Heavy Duty trucks used larger, higher-torque units. Note the transition year in 2012.
| Years | Model | Shift Type | Technical Note |
| 2009–2012 | NV271D | Manual | Floor-shift lever; extremely robust. |
| 2009–2012 | NV273D | Electric | Dashboard knob; common in Laramie Cummins models. |
| 2013–2018 | BW 44-46 | Electric | The standard HD electric shift unit for Gen 4.5. |
| 2013–2018 | BW 44-47 | Manual | The standard HD manual shift unit. |
3. Critical Technical Knowledge for “Buy Mustang parts Ltd”
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The Fluid Trap: This is the most common customer error.
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BW 44-44 (Auto) requires a specific high-viscosity fluid (Mopar BW44-44 Luxury Fluid).
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BW 44-45/46/47 typically use Mopar ATF+4.
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Selling Tip: Always include a note or a “Required Fluid” sticker on the case to prevent warranty claims caused by customers using the wrong oil.
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Input Spline Counts: * Units paired with the 6-speed 68RFE (Diesel) have a different input shaft than those paired with the AS69RC (Aisin) or the G56 (Manual). Always verify the donor vehicle’s transmission before listing.
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The 2016 Fluid Change: For the BW 44-44, Mopar changed the recommended fluid mid-cycle (around 2016) to a specialized “Mobil Fluid LT” based oil. When selling a 2016+ unit, ensure you specify the updated part number for the lubricant.
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