ZF 8HP Transmission Swap Parts List and Conversion Guide
8hp conversion · 8hp swap · parts list · swap kit
Most 8HP swaps do not fail because the gearbox was wrong. They stall because a $60 part was not ordered with the rest of the kit and the car sat on stands for three weeks waiting on it.
This is the complete parts list for a ZF 8HP conversion, grouped the way you actually buy it. Print it, tick it off, and order as one plan.
Plan first, buy second. Work out your controller, transmission variant and adapter combination before you order anything. Those three decisions determine everything else on this list.
Start with the three decisions that drive the whole list
Before you buy a single part, settle these:
- Which controller? TurboLamik, CanTCU or MaxxECU. This sets which 8HP variants you can run.
- Which 8HP variant? 8HP45, 8HP50, 8HP70, 8HP75, 8HP90 and so on. This sets your torque
headroom and your bellhousing options.
- Which adapter? Adapters are built for a specific engine and a specific 8HP bellhousing
pattern. This sets which donor transmissions will physically work.
Everything below is downstream of those three answers.
1. Transmission
The 8HP itself. When buying a used unit, check:
- Variant and generation stamped or identifiable on the case
- Bellhousing pattern matches the adapter you intend to run
- Output flange type (BMW 3-bolt with varying PCD, Dodge slip yoke or large flange, Audi
and Jaguar large offset flange)
- Converter included or not, and whether it is the converter matched to that unit
- TCU present, since some controllers need specific TCU hardware numbers
- Condition of the mechatronic unit, which is the expensive assembly inside
See our full guide on choosing a variant for the selection logic.
2. Engine to transmission adapters
The adapter plate that marries your engine block to the 8HP bellhousing.
Depending on the combination you may also need:
- Crank spacer or a custom flexplate to reach the converter
- Pilot bushing or a custom converter hub
- Starter relocation provision if the factory starter position is lost
Order the adapter for your exact engine and 8HP version. "8HP70 adapter" is not specific enough, because bellhousing patterns differ between the engines an 8HP70 came from.
3. Transmission output and driveshaft interface
- Output flange adapter to convert to a standard universal joint or slip yoke
- Driveshaft to suit the new length and angle
- Centre bearing / carrier provision if your chassis uses one
- Yoke or companion flange matching the diff end
Do not guess driveshaft length. Measure once the gearbox is physically mounted in the car. Tunnel clearance work can move the output position and change your measurement.
4. Transmission controller (TCU)
- Standalone controller: TurboLamik, CanTCU or MaxxECU, matched to your variant
- Wiring loom or harness for the controller
- Sensors the controller needs (engine speed, throttle, torque source if applicable)
- Shifter interface, which differs between manual, electronic and paddle input
- Loom for the 8HP itself if the donor did not include one
The controller choice has to come first, because it constrains your transmission options.
5. Shifter and paddles
- Shifter assembly matching the controller's input type
- Paddle shifters if you are running them
- Shifter mount or bracket for your chassis and tunnel
- Loom or connector between shifter and controller
Some 8HP configurations expect an electronic shifter input. Confirm what your controller supports before buying a shifter, and confirm what physically fits your tunnel.
6. Cooling system
The 8HP makes heat, and the cooling system is where budget builds cut corners and spend money twice.
- Transmission cooler sized to your use, not just to a stock replacement
- Cooler lines and fittings rated for the pressure and temperature
- Thermostatic bypass if your setup benefits from faster warm-up
- Cooler mounting with actual airflow, not tucked behind an intercooler
- Fluid to the correct specification for your 8HP generation
Cooling deserves its own plan. Track use and towing change the requirement completely.
7. Electronics and integration
- CAN bus wiring between controller, ECU and chassis
- ECU integration if your engine ECU needs to exchange data with the TCU
- Torque signal provision, either CAN-based or calculated, depending on your controller
- Immobiliser solution if your chosen transmission generation requires one
- Fusing, relays and power distribution
This is the section that most often delays a finished car. It is worth writing out the signal plan before you start crimping.
8. Cross members and brackets
- Gearbox cross member to suit the 8HP mount position
- Mount matched to the cross member
- Chassis brackets where the factory items no longer fit
- Clearancing work for larger variants
The 8HP90 and 8HP95 are physically larger than the smaller variants and more likely to need tunnel and cross member attention.
9. Fluids and service items
- Correct fluid for the specific 8HP generation
- Pan and filter assembly where serviceable
- Sump gasket or seal kit
- Sleeve and seal items for the converter and output areas
- Fill and check tooling to set the level correctly
Fluid level setting on an 8HP is temperature dependent and is one of the most commonly botched steps in a conversion. Get the procedure right before you rely on the box.
10. The small things that stop the car moving
- Fasteners in the correct grade and length for the adapter and flywheel
- Dowels and locating pins
- Wiring connectors, pins and seals for every loom you cut
- Heat shielding near the tunnel and exhaust
- Speedometer and signal provision for the chassis
- Fluid drain pan and a clean workspace honest enough to spot a leak
Ordering it as one plan
Work down the list in the order above and note the dependency at each step:
| Step | Depends on |
|---|---|
| Transmission | Controller support list |
| Adapter | Specific engine and 8HP bellhousing pattern |
| Output / driveshaft | Transmission mounted and measured |
| Controller and loom | Chosen controller and variant |
| Shifter | Controller input type and tunnel space |
| Cooling | Intended use, not just stock replacement |
| Electronics | Controller, ECU and chassis signals |
| Cross member | Transmission position in chassis |
| Fluids | 8HP generation |
Getting these in the right order is the difference between a swap that takes a month and one that takes a season.
Where we come in
We supply 8HP conversion parts and can help spec a complete combination: gearbox, controller, adapter, shifter, cooling and the integration bits that are easy to forget. Tell us your engine, chassis and target power, and we will work out which combination actually fits before you order.
Related guides
Ready to compare donors? The ZF 8HP gearboxes for sale in Australia lists the current 8HP45 and 8HP76 units with mileage and prices.