Rebuild the ZF 8HP transmission, step by step
A friendly, hands-on online course for the ZF8HP45, 55, 70 and 90, found in Audi, BMW, Dodge, Jeep, Rolls-Royce, Bentley and Maserati. You follow clear photos and simple instructions, from the first bolt to the final fluid fill.
Who this course is for
You do not need to be an expert. If you can use hand tools and you are ready to work carefully, we will walk you through every part of this gearbox in plain language.
Transmission shops
Add 8-speed rebuilds to your services.
Technicians
Learn the right order, the right clearances and the right tools.
Serious DIYers
Understand how it works before you open it.
Students
Learn from a complete, well-organised workshop guide.
One gearbox, many vehicles
The ZF8HP is used in two-wheel-drive and four-wheel-drive vehicles. The model you work on depends on the engine and the torque it must handle.
ZF8HP45 3.0L and 3.6L engines Chrysler, Dodge, Jeep, Audi, BMW
ZF8HP55 Mid-range engines Audi, BMW 1, 3, 5 and 7 series, Maserati
ZF8HP70 5.7L and 6.4L engines Dodge, Jeep, Chrysler, Bentley, Rolls-Royce
ZF8HP90 SRT 707-hp 6.2L Hellcat V8 High-torque applications
How the course works
1. Learn it
Understand the parts, the wiring and the noise signs before you touch a tool.
2. Take it apart
Follow photo-led disassembly for each clutch, brake and the valve body.
3. Rebuild it
Use the specs and adjustment steps to rebuild every unit correctly.
4. Put it back
Reassemble inside and out, then fill with the correct fluid.
Every lesson, in order
Six modules. Each lesson has a clear photo for every step, with a short note on what to watch for. Tap a module to open it.
Module 1: Get to know the ZF8HP
Start here. You will learn what is inside and how to read the warning signs.
Component Application Chart
Planetary Noise Diagnostic Chart
Decoupling Operation
Typical Wire Diagram
Solenoid Information
E-Shift Park Release Operation
Module 2: Remove the outside parts
Strip the outside of the transmission safely, with a separate lesson for each model.
ZF8HP55 External Disassembly
ZF8HP45 External Disassembly
Module 3: Open it up and take it apart
Go inside the case and remove each clutch pack and brake in the right order.
Transmission Internal Disassembly
A Brake Disassembly
E Clutch Disassembly
C Clutch Disassembly
D Clutch Disassembly
Valve Body Disassembly, with ZF8HP45 and ZF8HP55 information and reassembly
Module 4: Rebuild the clutches and brakes
The heart of the job. Rebuild each unit and set it to specification.
ZF8HP45 Park Hydraulic Schematic
D Clutch Rebuild
C Clutch Rebuild
E Clutch Rebuild
A and B Brake Rebuild
Brake and Clutch Specifications and Adjustment Procedures
Module 5: Pump, reassembly and finishing
Rebuild the pump, then put everything back together, inside and out.
Pump Assembly Rebuild
Transmission Internal Reassembly
ZF8HP45 External Reassembly
ZF8HP55 External Reassembly
Module 6: Reference library
Keep these pages open on your bench. You will use them on every job.
ZF8HP45 Case Passage Identification
ZF8HP45 Fluid Specification
ZF8HP55 Case Passage Identification
ZF8HP55 Fluid Specification
Special Service Tools
What you get
Step-by-step lessons with clear photos
Simple wording, no jargon walls
Wiring diagram and hydraulic schematics
Brake and clutch specifications
Case passage identification pages
Fluid specifications for 8HP45 and 8HP55
Special service tools list
Learn online, at your own pace
Frequently Asked Questions
The ZF8HP45, 55, 70 and 90. Full external disassembly and reassembly lessons are included for the 8HP45 and the 8HP55, and the internal lessons apply across the family.
Some steps use special service tools. The full list is in the course, so you can prepare before you start.
Yes. The course is online, so you can pause, repeat a lesson and come back whenever you need.
Yes, if you are comfortable with tools. Each lesson shows one step at a time with a photo, so you always know what to do next.
Ready to rebuild with confidence?
Join the ZF8HP course online and start
ZF8HP45 / 55 / 70 / 90 rebuild course. Audi, BMW, Dodge, Jeep.
SPECIAL LAUNCH OFFER FOR OUR MEMBERS
We're excited to offer you an exclusive launch discount
Existing Members: Only $455
New Members: Just $755
Limited-Time Offer – Order Before November 1, 2026
After November 1, 2026, the regular price for everyone will be $1,255.
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Take advantage of our launch prices while they last.
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