The ZF 8HP has quietly become the reference standard for automatic transmission swaps. Designed and first built by ZF's Saarbrücken plant, it debuted in 2008 on the BMW 760Li and has since been adopted by more than 20 brands — BMW, Audi, Jaguar Land Rover, Maserati, and Ram among them — with over 15 million units produced by 2023. That scale is exactly why it works so well as a swap candidate: parts, donor transmissions, and aftermarket support are abundant in a way that's simply not true for more exotic transmission options.
If you're new to the swap and trying to understand what a "kit" actually includes, here's the breakdown.
Every ZF 8HP swap kit needs to solve each link in this chain
The Core Components of Any ZF 8HP Swap Kit
| Component | What it does | What to watch for |
|---|---|---|
| Adapter plate | Physically joins your engine's bellhousing to the 8HP's input bell | Billet 6061-T6, full bolt-circle mounting surface, true axial alignment |
| Converter adapter | Connects crankshaft to the torque converter | Must match your specific converter's mounting geometry |
| Flexplate | Replaces the factory piece to handle automatic-conversion clamping loads | Billet over reused OEM parts, especially on JZ, K-series and LS engines |
| Driveshaft adapter | Converts the 8HP output flange to your chassis's U-joint pattern | Confirm bolt circle (commonly 1310 or 1350) matches your driveshaft |
Choosing Your 8HP Variant
The naming convention tells you the transmission's factory torque capacity:
All three variants are known to handle real-world loads well above their factory rating. For most performance builds swapping in a JZ, K-series, SR20 or GM LS/LT engine, the 8HP70 sourced from a 2015+ Dodge Charger, Challenger, or Chrysler 300 is the practical sweet spot: it's the most common unit in junkyards, it's meaningfully cheaper than a BMW-sourced 8HP, and the aftermarket adapter and controller ecosystem is built primarily around it.
Complete Kits for JZ, K-Series, SR20 and LS/LT Platforms
Autosports Engineering builds complete adapter kits designed around specific engine-to-8HP combinations rather than universal adapters that need modification.
All three include a billet converter adapter plate and billet flex plate as standard, and there are equivalent kits built for Dodge/Mopar-sourced 8HP70 units, Jaguar donor transmissions, and BMW N63/N54/N55 platforms if your engine or transmission source differs from the BMW-donor default.
Don't Skip the Controller
A completed adapter installation gets the transmission mechanically in the car — it does nothing for shift behavior. The 8HP needs a standalone TCU to replace or bypass the factory control logic, since it was designed to run on a CAN network talking to a specific OEM ECU that won't exist in your swap. This is a separate purchase from the adapter kit and should be budgeted from the start rather than added on after the mechanical install is done.
A ZF 8HP swap kit, done right, is really four systems working together: a precisely machined adapter plate, a converter adapter and flexplate rated for the loads you're introducing, a driveshaft solution for your specific chassis, and a standalone controller to actually run the thing.
Putting It All Together
Buying an engine-specific kit rather than piecing together generic components solves most of the fitment questions before they become install-day problems. Have a combination that isn't listed above? Reach out — we can point you toward the right parts or flag anything that needs custom fabrication before you buy a donor transmission.