Full 6HP26 fluid service in one box: pan with the filter built in, gasket, 21 bolts, drain and fill plugs, and 6 liters of German ATF.
If your BMW 550i, 750Li, X5 or Jaguar XF has never had its "lifetime" transmission fluid touched, or it has started flaring between gears, engaging late into Drive or weeping at the pan rail, this is the box that does the whole ZF 6HP26 fluid service at once. Kit 333 903 KIT combines the pan with its built-in filter, the pan gasket, the filter O-ring, a new drain plug and fill plug, 21 pan bolts, two pan magnets and six 1-liter bottles of German-made synthetic ATF. Nothing else to source and nothing reused that should not be.
The 6HP26 pulls its fluid supply from the pan through a filter that, on this unit, is molded into the pan itself rather than bolted in as a separate element. ZF's own oil change kit bulletin splits the 6HP family by pan material: aluminum and steel pans use a separate filter, while the plastic pan carries an integrated filter and is replaced as one assembly. That is why a real service here means a new pan, not just a new filter. A clogged element starves the pump, line pressure drops, clutches slip and fluid heat climbs, which is how a neglected fluid change turns into a clutch or mechatronic repair.
If harsh shifts persist after a fresh fill, the 6HP26's known weak points are mechatronic solenoid wear and lip seal pressure loss, and new fluid will not cure either.
Read the pan before you clean it. ZF's guidance is direct: if the old fluid smells burned or the pan holds large chips, stop and diagnose rather than finishing the service. Fine gray paste on the magnets is normal wear. Our ZF6HP filter and pan service guide walks through that check and the fill procedure, and the high-mileage service checklist covers what to look at first on a unit with an unknown history.
BMW: 745i and 745Li 2002-2005, 760Li 2003-2008, 545i and 645Ci 2004-2005, 760i 2004-2006, 550i and 650i 2006-2010, 750i and 750Li 2006-2012, X5 4.8i 2007-2008, X6 xDrive50i 2008-2010, 335d 2009-2011, X5 xDrive35d 2009-2013, X5 xDrive48i 2009-2010 and Alpina B7 2011-2012. Jaguar: S-Type 2003-2008, XJ8, XJR and Vanden Plas 2004-2009, Super V8 2005-2009, XF 2009-2012, XFR 2010-2012, XJ 2010-2012, XK 2007-2015 and XKR 2003-2015. ZF built several 6HP pans that look alike but do not interchange, so compare your old pan and the transmission ID plate before ordering, or send us your year and VIN and we will check it. Every other 6HP26 part we carry is on the ZF 6HP collection page.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Yes on the plastic-pan units this kit fits. ZF's oil change kit bulletin lists the plastic pan with an integrated filter that is replaced as one assembly, which is why the kit ships a complete pan instead of a loose filter.
For a pan drop and refill, yes. A pan service typically recovers roughly 5 to 7 liters because the torque converter and cooler keep their fluid. ZF lists the 6HP26A61 total dry fill at 9.4 liters plus 0.5 liter for the cooler, so a dry fill after a rebuild needs more.
It is not worth the risk. Old bolts are often corroded or stretched and the plugs seal once on their washers, which is why new bolts and both plugs are in the box. Reused hardware is a common cause of a fresh service that starts weeping a few months later.
ZF's lubricant list calls the fill maintenance-free but recommends an oil change after 150,000 km (about 93,000 miles), and sooner for high heat, towing, heavy load or an unknown history.
It fixes shift complaints caused by old fluid and a loaded filter. If the shifts are still harsh after the fill is set correctly, the cause is usually worn mechatronic solenoids or lip seals, which need separate parts.
You need a way to read transmission fluid temperature to set the level correctly. Many owners also reset the transmission adaptations afterward so the unit relearns shift timing on clean fluid.
