Journal Bearing Garrett GT4708 (aka GT4780)

The Garrett GT4708 journal bearing turbocharger is built for high-horsepower applications where massive airflow and turbine housing flexibility are non-negotiable. Designed for enthusiasts pushing serious power levels, this unit gives builders the option to dial in turbine housing A/R to match their specific powerband goals. It’s the choice for those building toward the upper limits of what a single turbo can deliver.

Specifications

• Bearing Type: Journal Bearing
• Compressor Wheel Exducer: 108.0mm
• Compressor Wheel Inducer: 80.7mm
• Compressor Trim: 56
• Compressor Housing A/R: 0.69
• Compressor Inlet: 6″
• Compressor Outlet: 3.5″ slip on connection
• Turbine Wheel: 92.7mm
• Turbine Trim: 82
• Turbine Housing A/R Options: 0.96, 1.08, 1.23, 1.39
• Turbine Inlet: T6 undivided
• Turbine Outlet: 5″ V-band
• HP Capacity: Close to 1200HP
• Garrett P/N: 763740-5001S
• Alternate P/N: 767564-0001
• Also Known As: GT4780

Performance & Application

This turbocharger is engineered for extreme horsepower builds capable of approaching four-digit output figures. The 108mm compressor wheel and large 6″ inlet are matched to move the volume of air required to support these power levels, while the selectable turbine housing A/R options give builders the ability to tune the balance between response and top-end flow. The T6 undivided turbine inlet and 5″ V-band outlet support high-flow exhaust housing configurations suited to serious forced induction setups. This is a turbocharger for builders targeting maximum power rather than everyday street response.

Frequently Asked Questions

What HP can the GT4708 support?

The GT4708 is capable of close to 1200HP.

Is this a ball bearing or journal bearing turbo?

This is a journal bearing turbocharger.

What compressor inlet and turbine outlet does this unit use?

The compressor housing uses a 6″ inlet with a 3.5″ outlet slip on connection, while the turbine housing uses a T6 undivided inlet and a 5″ V-band outlet.

What does GT4780 refer to?

GT4780 is an alternate name for the Garrett GT4708.

For builders chasing near-1200HP power targets with the flexibility to tailor turbine housing A/R to their build, the GT4708 journal bearing turbocharger delivers the airflow capacity and configuration options to get there.