8HP45 Overhaul Kit, new and ready to install. Fits the 8HP45. Ships fast from the USA.
If your BMW 328i, X3 or X1 with the ZF 8HP45 slips, flares between gears or leaks from the bellhousing, a rebuild is the fix that lasts. This is a new aftermarket overhaul kit for the GA8HP45Z, and it is more than a gasket set. The kit photo shows a full set of friction plates alongside the front and rear seals, the sealing rings and O-rings, the small valve body and sleeve seals, and the large gaskets. It covers the soft parts and frictions you replace every time an 8HP45 is opened.
The 8HP45 shifts eight forward gears with only five shift elements: two multi-plate brakes (A and B) and three rotating clutches (C, D and E). Three of the five are applied in every gear, and each shift swaps exactly one element for another. That design works well, but each pack has to hold full torque with very little slip, and the mechatronic expects exact clearances when it times the hand-off from one element to the next. When the friction lining wears, or a piston seal or rotating sealing ring starts to leak, the controller keeps adding pressure to hide it until it runs out of adaptation room. The kit gives you new friction material plus every seal on the pressure path from the pump to each piston, so the controller has a fresh, tight unit to learn.
Many 8HP complaints are not worn frictions. Software, a low fluid level, a leaking connector sleeve or a worn valve body bore can all cause harsh or slipping shifts, and none of them needs a teardown. BMW's 8HP diagnosis bulletin tells techs to check the level first on every concern and to avoid resetting adaptations as a first fix. Read our ZF8HP BMW 3 Series common problems and BMW 3 Series shift problems guides. If the level is right, the software is current and the unit still slips under load, the clutches are the likely cause and this kit is the right buy.
This kit is for the first-generation ZF 8HP45, tag code GA8HP45Z. The listing's vehicle chart names the BMW 1 Series (2010-11), 3 Series (2011-15), 5 Series (2009-11), X1 (2009-11), X3 (2011-15), X4 and X5, plus the Jaguar XF and XJ 3.0L and the Land Rover Discovery. Treat that list as a starting point only. Several vehicles in those years shipped with a six-speed or a larger 8HP70, so read the ID plate on the side of the case and confirm GA8HP45Z before you order. The kit is not listed for the Chrysler 845RE or the second-generation 8HP50. Not sure? Send us your year and VIN. You can browse all 8HP parts on our ZF 8HP collection.
| Fits | 8HP45 |
| 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.
None are visible in the kit photo, which shows frictions, seals, O-rings and gaskets. Plan to reuse good steels or buy them separately if yours are heat-marked or warped.
Read the ID plate on the side of the case and look for GA8HP45Z. In the same years, some BMW, Jaguar and Land Rover models used a six-speed or the larger 8HP70, so the plate or a VIN check is the only safe way to confirm.
It is not listed for the 845RE, so we do not recommend it there. Send us your year and VIN and we will match the correct kit.
Use ZF LifeguardFluid 8. ZF's oil change instructions say to set the level with the engine running, within the specified hot window, and to fill until fluid runs out of the fill hole.
Yes. With new frictions and clearances, reset the transmission adaptations with a capable scan tool. Then drive gently through every gear so the mechatronic learns the rebuilt unit.
