The new larger Tribeca engine displacement increases engine torque to 333Nm at 4,400 rpm, and horsepower to 256bhp at 6,000 rpm, providing improved low-end torque without sacrificing high-rpm power. The new engine package adds displacement without adding overall size, not only maintains excellent emissions levels but delivers improved fuel efficiency in real world driving situations. The new 3.6-litre engine features Active Valve Control System (AVCS) variable valve timing on both the intake and exhaust valves (the 3.0-litre engine had AVCS on the intake side only).

Redesigned exhaust, cooling and power steering systems are matched to the new engine's output and torque curve. Subaru claims that improvements mean the new engine is also quieter.

The engine is connected to a five-speed automatic transmission with Sportshift that features an all-new torque lock-up converter and a new transmission control unit. The result is claimed to be faster gearshifts with less lag time and smoother acceleration.

New shift logic also improves performance in hilly terrain. The new shift control system uses the car speed and accelerator opening to determine available driving power while simultaneously calculating the optimum gear position for the road gradient. This not only results in fewer unnecessary gear shifts when climbing or descending grades, but also results in a further improvement to fuel economy.

The transmission drives through the Subaru Variable Torque Distribution (VTD) Symmetrical All-Wheel Drive system. Enhancing the AWD system are standard Vehicle Dynamics Control (VDC) and four-wheel traction control system (TCS).

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