Cummins 6.7L ISB Turbocharger | 3786778HX | Holset HE300VG | Reman

Genuine Holset factory-remanufactured HE300VG variable-geometry turbocharger for the Cummins ISB 6.7L commercial/medium-duty engine. Part number 3786778HX includes the calibrated VGT actuator and restores factory boost control and variable-geometry function. Built for commercial ISB 6.7L applications (Freightliner, vocational trucks, buses) — this is not the Dodge Ram pickup turbo. Confirm your engine and EPA era before ordering.

Key Features:

• Genuine Holset factory-remanufactured HE300VG VGT turbocharger for the Cummins ISB 6.7L
• Includes the calibrated VGT actuator (plug-and-play)
• Restores factory boost control and variable-geometry function
• For commercial/medium-duty ISB 6.7L applications (Freightliner, vocational trucks, delivery vehicles, buses)
• Reman exchange — core return required

Specifications:

• Base part number: 3786778HX (base 3786778 / 3786778H)
• Turbocharger model: Holset HE300VG (variable geometry)
• Condition: Remanufactured (genuine Holset factory reman)
• Actuator: included, calibrated
• Engine: Cummins ISB 6.7L (commercial/medium-duty)

Compatibility / Fitment:

• Cummins ISB 6.7L — commercial/medium-duty (Freightliner, vocational trucks, delivery vehicles, buses)
• Not the Dodge Ram pickup turbo — the 6.7L pickup uses a different unit (HE351VE or a different HE300VG). Confirm your application
• Verify EPA era and engine serial (ESN) before ordering; some engines require an actuator adapter harness
• Common cross-references: 3786778H, 4309451RX, 4352325RX

Conclusion:

The 3786778HX is a genuine Holset factory-remanufactured HE300VG VGT turbocharger with a calibrated actuator for the commercial Cummins ISB 6.7L. It restores factory boost control and variable-geometry function on Freightliner and vocational applications. Confirm your engine, EPA era, and that this is the commercial (not pickup) turbo before ordering; core return required.