Complete gasket, lip seal, O-ring and sealing ring set for the ZF6HP26 and 6HP28 in BMW, Jaguar and Land Rover, replacing ZF kit T18300A.
A ZF 6HP26 that has started to weep at the pan, drip from the connector area or lose a little apply pressure when hot does not always need new clutches. When the frictions still look good and the problem is hardened rubber, the T18300A seal kit gives you every gasket, lip seal, O-ring and sealing ring the six-speed needs to be resealed properly. It is the rubber-only package, a light 1.32 lb box with no frictions or steels, for BMW 3, 5, 6 and 7 Series, X3, X5 and X6 (550i and 750i included) plus Jaguar and Land Rover models running the 6HP26 or 6HP28.
Each of the 6HP26's five shift elements is applied by hydraulic pressure that has to get from the mechatronic, through the case and along the shafts into a rotating drum. Every joint on that path is sealed by something in this kit: Teflon sealing rings on the shafts, square-cut and lathe-cut rings on the pistons, molded lip seals, and the O-rings on the case passages, pump and valve body bores. When those parts harden after 100,000 miles of heat cycles, pressure bleeds off between circuits. The mechatronic keeps raising fill pressure to compensate, the shifts get slower and softer, and fluid starts appearing outside the case. T18300A is the combined set that ZF's aftermarket numbering builds from T18302A, T183080A and T183081A, referenced to OE 1068298051.
Pull the pan and look at the fluid and magnets before you commit. Clean or lightly dark fluid with no friction material says the clutches are still serviceable and a reseal is a sensible repair. Heavy debris or a burnt smell means the frictions are finished, and you would be better served by the T18302A kit with clutches. For pressure-related shift complaints, our 6HP pressure control solenoid guide explains how to separate a sealing problem from a solenoid one, and the Jaguar 6HP shift problems guide covers the Jaguar-specific faults.
The kit is listed for the ZF 6HP26 and 6HP28 in BMW 3, 5, 6 and 7 Series, X3, X5 and X6 models, and in Jaguar and Land Rover vehicles fitted with those units. Year ranges vary by model, so go by the tag on the transmission case rather than the vehicle alone. Do not use it on a 6HP19 or 6HP21, which have different internals. Sonnax groups the 6HP26 with the first-generation units and the 6HP28 with the second generation, so match valve body parts to your generation even though this seal set is listed for both. Send us your year and VIN if you want us to check it. Everything else for these transmissions is on our ZF 6HP parts collection.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. It is the gasket and seal package only: case and pump gaskets, lip seals, O-rings and sealing rings. If your clutches are worn, the T18302A kit adds a friction set.
The connector leak comes from the sealing sleeve O-rings. Replace the sleeve and the pan gasket together, seat the sleeve fully, and check that the plug sits within 3 mm of the case when locked.
Pan, connector sleeve and external seals can be done in the car. The piston seals and shaft sealing rings in this kit are only reached with the transmission out and disassembled.
Use ZF LifeguardFluid 6. Capacity varies by vehicle and pan type, so fill by ZF's overflow method: fill until it runs out of the fill hole, then set the final level at 30-35 C oil temperature.
The listing covers both the 6HP26 and the 6HP28. Read the ZF tag on your case to confirm the model, and note the two generations use different valve body parts.
