automatic transmission 4×4 Audi A8 4.0Tfsi code PTS with 57km

Transmission Type: ZF 8HP55A (Audi 0BK)

Mileage: 57 km (Delivery Mileage / Grade A+)

Year of Manufacture: 2016–2017

Application: 4.0 TFSI V8 Quattro (A8 / A8L / S8)

The PTS is a high-performance 8-speed torque-converter automatic transmission manufactured by ZF for Audi’s flagship D4-generation A8. Specifically paired with the $4.0\text{L}$ Twin-Turbo V8 engine, this gearbox is engineered to handle the massive low-end torque ($600\text{ Nm}+$) while maintaining the “magic carpet” smoothness expected of a luxury limousine. At 57 km, this unit is in pristine, showroom condition.

Technical Specifications

• Gearbox Family: ZF 8HP55A (0BK series).

• Torque Rating: Rated for a sustained $700\text{ Nm}$ peak input.

• AWD System: Integrated permanent Quattro with a Torsen-style center differential housed within the rear of the transmission casing.

• Shifting Speed: Capable of gear changes in as little as $200\text{ ms}$ in Sport mode.

• Start-Stop Ready: Equipped with an internal hydraulic impulse storage (HIS) system to allow for instant gear engagement upon engine restart.

Key Features

• Wide Ratio Spread: The 8-speed architecture allows for a very short 1st gear for aggressive acceleration and an ultra-tall 8th gear for fuel-efficient highway cruising ($1,800\text{ RPM at } 130\text{ km/h}$).

• Dynamic Shift Program (DSP): The PTS code features the final software revision for the D4 chassis, offering improved logic for grade detection (preventing hunting on hills) and smoother downshifts during braking.

• Integrated Differential: Unlike many AWD cars, the front-axle output and the center differential are part of the transmission assembly, ensuring a compact and rigid drivetrain.

Professional Installation & Technical Notes

1. Component Protection (Anti-Theft): The internal Transmission Control Unit (TCU) is electronically locked to the donor vehicle. To install this in a different A8, you must use Audi ODIS with an online connection to the factory server to remove the “Component Protection” lock.

2. Fluid Requirements: Even with only 57 km, ensure the unit is filled with Audi G 060 162 A2 (Green) or ZF Lifeguard 8. Do not use standard ATF or older 6-speed fluids, as the friction coefficients are different.

3. Torque Converter Seating: Ensure the torque converter is fully engaged on the input shaft splines before bolting to the engine. If the converter is not seated properly, the internal oil pump will be crushed upon the first engine start.

4. Cooling System Hygiene: If you are replacing a failed transmission, the oil lines and radiator-integrated cooler must be professionally flushed. Any debris from a previous failure will instantly damage the mechatronics of this new unit.

Inventory Note: The PTS is a direct replacement for codes such as NWK, SHG, and TCC in