Pan gasket, piston O-rings, shaft seals and sealing rings to reseal a ZF 6HP26 or 6HP28 during an overhaul or leak repair on BMW, Audi and Land Rover.
This kit is for the person who has a ZF 6HP26 or 6HP28 on the bench, or is about to: a BMW 545i, 550i or 750i, an X5 4.4i or 4.8i, an Audi A6, A8 or Q7, a Range Rover, Range Rover Sport or Discovery, or a V8 Jaguar. The usual reasons are ATF dripping from the bellhousing or pan, oil wicking into the mechatronic connector, or shifts that went slow and soft as the miles piled up. It contains the rubber and sealing-ring side of the job: molded pan gasket, the large clutch piston O-rings, front and rear shaft seals, the selector shaft seal, and the small O-rings and square-cut rings for the shafts and feed passages.
The 6HP family uses a Lepelletier gear train with five shift elements: three rotating clutches and two brakes. The mechatronic sends pressure to each one through passages in the case and shafts, and every place where oil crosses from a stationary part into a spinning drum is sealed by a sealing ring, while each apply piston is sealed by its own O-rings or lip seals. The 6HP28 is the heavier-duty version used behind larger V8 and supercharged engines, and the two share the same overall layout. After years of heat cycling the rubber hardens and the rings wear their grooves. Pressure leaks between circuits, the clutch fills late, and the software keeps adding pressure to cover it until it runs out of adaptation room. Outside the case, the same aging shows up as fluid at the converter seal, output seal and pan rail.
Find out whether you are fixing leaks or worn hardware. Clean the case and trace the leak to its highest wet point; a pan or connector leak alone can often be fixed without opening the unit. If the complaint is shift quality, pull the pan and look at the magnets: clean or lightly dark fluid with no friction debris supports a reseal, while burnt fluid and heavy material mean the clutch packs need replacing too. Our BMW 5 Series 6HP common problems guide lays out the typical failure order, and the 6HP pump failure guide explains how to tell a pump or converter seal leak from a bushing problem.
The listing names the 6HP26 and 6HP28 in BMW 3, 5, 6 and 7 Series, X5 and X6; Audi A6 C6, A8 D3 and Q7; Range Rover L322, Range Rover Sport, Discovery 3 and 4; and Jaguar XJ and XF. Model lines in that list used other gearboxes in some years and engines, including the smaller 6HP19 and 6HP21 and later the 8HP, and those units do not take these seals. Go by the identification tag on the side of the case, not by the car alone, and if you cannot read it, send us your year and VIN. Sonnax groups the 6HP26 with the first-generation ZF6 units and the 6HP28 with the second generation; that matters for valve body parts but not for this soft-parts kit. See all parts for these gearboxes on our ZF 6HP collection page.
Ships fast from the USA.
| Transmission | ZF 6HP26, 6HP28 (6-speed RWD/AWD) |
| Fits | BMW 3/5/6/7 Series, X5, X6; Audi A6 C6, A8 D3, Q7; Range Rover L322, Range Rover Sport, Discovery 3/4; Jaguar XJ/XF |
| Includes | Oil pan gasket, piston O-rings, shaft seals, sealing rings |
| Does not include | Frictions, steels, filter |
| Weight | 15.8 oz |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. It is seals, O-rings, sealing rings and the pan gasket only. Frictions, steels and the filter are not included; on the 6HP26 the filter is part of the plastic pan.
No. It is built for the 6HP26 and 6HP28. The smaller 6HP19 and 6HP21 have different internals. Check the tag on your transmission case before ordering.
Often yes. Pan gasket, connector sleeve and output seal leaks can be repaired with the transmission in the car. The internal piston seals and sealing rings only make sense when the unit is disassembled.
Use a ZF 6HP-spec fluid, either ZF LifeguardFluid 6 or an equivalent marketed for it, and set the level at the fill plug with the engine running at the correct temperature.
Yes. Clear the stored adaptations with a capable scan tool after the work so the mechatronic relearns clutch fill times with the new seals instead of the old compensated values.
