ZF8HP Overhaul Kit, new and ready to install. Fits the ZF8HP. Ships fast from the USA.
If you have an Audi A6, A7 or a US-market A4 or A5 quattro with the eight-speed automatic out on the bench, or you are chasing seeping seals and soft, slow engagements on a high-mileage unit, this is the rubber and paper half of the job. It is a new overhaul kit for the ZF 8HP55, the transmission Audi codes 0BK. It contains the gaskets, lip seals, O-rings and sealing rings you replace every time the case is opened. It does not include friction plates, steels or a filter, so plan to buy those separately if the clutches are worn.
The 8HP55 is part of ZF's first-generation eight-speed family, rated around 650 Nm, and it uses the same layout as its BMW and Chrysler siblings: four planetary sets controlled by five shift elements, two brakes and three clutches. Each element is applied by oil pressure from the pump, routed through the mechatronic and across rotating sealing rings to its piston. Every gear holds three elements at once, so a hardened piston seal or a worn sealing ring in one circuit can upset several shifts. The controller tries to hide the leak by adding pressure until it runs out of adaptation room. Replacing every seal on that path is what lets a rebuilt unit hold pressure and learn clean shifts again. The kit photo shows the molded pan gasket, the large case and cover gaskets, a set of shaft lip seals, the big piston O-rings and the small O-rings for the valve body and sleeve.
A leak at a single gasket can often be fixed without a teardown, so find the source before ordering a full kit. Clean the case, drive the car and trace where the fluid starts. For slip and harsh-shift complaints, rule out the cheaper causes first: a low level, outdated software, or wear in the valve body. Our ZF8HP common problems guide covers how those show up, and the 8HP pressure control solenoid symptoms guide helps separate a solenoid fault from internal leakage. If the transmission is coming apart anyway, this kit is the baseline.
This kit is labeled for the 8HP55, Audi transmission code 0BK. Factory 8HP55 applications are the 2011-2016 US-market A4 and A5 quattro and the C7 A6 and A7. The application list supplied with the kit also names first-generation BMW, Chrysler, Dodge, Jeep, Ram, Land Rover and VW Amarok vehicles. Those use the 8HP45 or 8HP70, and their pan, case gaskets and shaft seals are not shaped like the Audi parts, so do not order on that list alone. Read the code on your transmission, lay your old gaskets beside the kit photo, or send us your year and VIN and we will check. It is not for second-generation units such as the 8HP65 or 8HP50. More parts for this family are on our ZF 8HP parts page.
Soak the new seals in clean ATF before assembly, lubricate the sealing rings with assembly gel so they sit in their grooves, and air-check each clutch and brake circuit before the case closes. Install shaft seals square with a proper driver, and torque the pan and covers in sequence. If the frictions are glazed, pair this kit with a friction set; on BMW 8HP45 units our 8HP45 overhaul kit with frictions covers both, and the 8HP70 gasket and seal kit is the right set for the larger unit. ZF states only LifeguardFluid 8 or 9 should go into an 8HP. Fill, then check the level with the engine running and the fluid between 30 and 50 C, topping up until it just runs out of the fill hole. Finish with an adaptation reset and road-test relearn.
| Fits | ZF8HP |
| Part type | Overhaul Kit |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The 8HP55 (Audi code 0BK) was used in the 2011-2016 US-market A4 and A5 quattro and the C7-generation A6 and A7. Check the code on your transmission before ordering.
No. It is a gasket and seal kit: pan and case gaskets, shaft lip seals, piston O-rings and sealing rings. Friction plates, steels and the filter are bought separately.
The kit is built around the Audi 8HP55. BMW and Chrysler-family units use the 8HP45 or 8HP70, which have different gaskets and seals. Send us your year and VIN, or look at our 8HP45 and 8HP70 kits.
ZF says only LifeguardFluid 8 or 9 should be used in the 8HP. Fill to the level hole with the engine running and the fluid between 30 and 50 C.
Only if the slip comes from internal pressure leaks. If the friction plates are burnt, new seals will not bring them back, so inspect the packs during the teardown and replace frictions as needed.
