Seven-piece sleeve and connector seal kit that stops the ZF 6HP26 mechatronic bridge leak, also fitting 6HP26X, 6HP28 and 6HP32 units.
A BMW or other ZF 6HP26 application with ATF seeping from the back of the case, an intermittent electrical fault inside the transmission connector, or a solenoid or pressure code that comes and goes with temperature is a textbook case for the mechatronic bridge sleeve - not the pan gasket it usually gets blamed on. This seven-piece kit replaces the sleeve and every O-ring at that connector in one order.
The mechatronic unit sends and receives everything - hydraulic fluid and wiring both - through a single bridge where a plastic sleeve and a stack of O-rings seal the case connector to the outside world. That plastic sleeve and its seals harden with heat over time. Once they do, ATF wicks past them and runs down the outside of the case, and on a bad enough leak it travels up the wiring loom and into the TCM connector itself, corroding pins and creating an electrical fault that has nothing to do with wiring on the surface.
Topping the fluid off never fixes this leak - the seals have to come out - but it is worth confirming the bridge sleeve is the actual source before you drop the pan. Check for fluid specifically at the case connector rather than along the pan rail, and if you're also chasing a shift complaint on the same unit, our ZF6HP valve body symptoms and testing guide covers vacuum-testing the solenoids so you don't replace seals and miss a failing solenoid in the same job. This kit matches OE references 24347588727, 24347588725 and 24107519314.
This kit fits the ZF 6HP26 and its close relatives - 6HP26X, 6HP28, 6HP32 and 6HP34 - across BMW and other ZF six-speed automatic applications. The connector bridge design is shared across this family, so the same seven pieces cover all of them; see the full ZF6HP parts collection if you need a 6HP26 valve body or solenoid kit alongside it.
The job runs from the bottom. Drain and drop the pan, pull the filter, then release the case connector from the outside and push the old sleeve down into the case; it comes out with the valve body area exposed. Clean the bore and the connector body before anything goes back in. Seat the new O-rings dry and clean, lubricate them lightly with ATF, press the new sleeve squarely into the bore without cocking it, and lock the connector back into the case until it clicks. Refill through the fill plug with ZF-spec ATF and set the level at the specified fluid temperature - these units have no dipstick and are level-critical. Do this any time the mechatronic unit is out for solenoid or valve body work; the seals are cheap next to the labor of dropping the pan a second time.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The sleeve and O-rings that seal the ZF 6HP26 mechatronic connector bridge to the case. When they harden with age, ATF leaks past them and can track up the wiring into the TCM connector, causing both a fluid leak and intermittent electrical faults.
No. This is a seal kit for the connector bridge where the valve body meets the outside of the case. It does not replace the valve body or its solenoids - if those are also worn, pair this kit with a valve body or solenoid kit.
No. The job is done from underneath by dropping the pan and filter, then releasing the case connector from outside to access the sleeve and O-rings.
Check specifically at the case connector, not along the pan rail. A bridge-sleeve leak often shows up as fluid tracking toward the wiring loom or into the connector itself, which a pan gasket leak does not do.
The ZF 6HP26X, 6HP28, 6HP32 and 6HP34 share the same connector bridge design, so this kit fits all of them in addition to the 6HP26.
