FERRARI PUROSANGUE F175 943858 POWER TAKE OFF

In 2026, the part number 943858 identifies the Power Take Off Unit (PTU) for the Ferrari Purosangue (F175).

This is arguably the most complex mechanical component of the Purosangue’s drivetrain. It is the heart of the 4RM-S (Four-Wheel Drive Sophisticated) system, allowing the mid-front mounted V12 to send power to the front wheels while the primary transmission sits at the rear.

1. Technical Identification & Function

• Component: Power Take Off Unit (PTU).

• Location: Mounted directly to the front of the V12 engine.

• Mechanism: The PTU takes drive directly from the crankshaft. It features its own two-speed transmission (plus reverse) and two independent wet clutches. This allows the front wheels to be powered independently of the rear 8-speed DCT, facilitating torque vectoring on the front axle.

• Operation Range: Like the GTC4Lusso before it, the PTU typically operates only in the first four gears of the main gearbox and up to a certain speed (approx. $200\text{ km/h}$), after which the car becomes purely rear-wheel drive to save weight and reduce friction.

2. 2026 Market Pricing (Estimated USD)

The PTU is a “Masterpiece” component. Because of its precision gears and integrated clutch packs, it is one of the most expensive single assemblies in the vehicle.

3. Installation & Critical Service

• Engine-Out/Partial Drop: Replacing part 943858 is an extremely labor-intensive task. Because it is bolted to the front of the block and interfaces with the front half-shafts, significant portions of the front suspension and cooling system must be dismantled.

• Fluids: The PTU uses a specific synthetic lubricant and hydraulic fluid for its clutches. By 2026, it is standard practice to change the PTU oil every 2 years or 20,000 km, even if Ferrari lists it as a longer interval, to prevent clutch plate wear.

• Calibration: After installation, the PTU must be synced with the Side Slip Control (SSC) 8.0. The “Clutch Kiss Point” must be calibrated via the Ferrari DEIS tool so that the front-wheel engagement is seamless.

4. 2026 Common Issues: Seals & Sensors

By 2026, early Purosangue owners have noted two main areas of attention for the PTU:

• Input Shaft Seals: The seal where the PTU meets the crankshaft can occasionally weep. Because of the heat generated by the V12, these seals can harden over time.

• Thermal Management: The PTU has its own cooling circuit. If the car is used for heavy “launch control” starts or snow-drifting, monitoring the PTU temperature on the passenger display is vital to avoid a “4WD System Overheating” limp-mode.