Rebuilding either of these transmissions isn't overly difficult, but does require care, some specialized tools, and proper procedure to be followed closely. In How to Rebuild and Modify Ford C4 and C6 Automatic Transmissions, author George Reid walks readers through the process step-by-step, from removing the transmission from the vehicle, to complete disassembly and cleaning, to careful reassembly, to proper re-installation and road testing. In addition, if the transmission will be used in a high-performance or competition situation, the author includes the various steps required to bolster the unit's strength, using commonly available aftermarket components.
Each chapter contains special notes, sidebars, and technical tips to assist the reader at every step in the process. Some refer to safety, others to time-saving advice, and others to small modifications that may aid long-term durability or help the builder tailor the shift firmness. The author's extensive research and experience with these popular transmissions has resulted in a well-rounded full-color technical guide to their revitalization.
Acknowledgments
 What is a Workbench© Book? 
Chapter 1: History and Facts 
 The C4 
 The C5 
 The C6 
 How to Read Ford Part and Casting Numbers 
Chapter 2: Getting Started 
 Safety Equipment 
 A Place to Work 
 Tools of the Trade 
 Chapter 3: Disassembly 
 C4 Disassembly 
 C6 Teardown Notebook 
 C6 Disassembly 
Chapter 4: C4 Cruise-O-Matic/Select-Shift 
 C4 Identification 
 C4 Operation 
 Building a Better C4 
 Intermediate Servo 
 Front Pump 
 Valve Body 
 Throttle Valve Operation 
 Building the C4 
 More for Your C4
 Reassembly 
Chapter 5: C4 Shift Kits 
 Disassembly 
 Reassembly 
Chapter 6: C6 Select-Shift 
 C6 Operation 
 Throttle Valve Operation 
 Intermediate Servo and Apply Levers 
 Front Pump 
 Valve Body 
 Building Tips 
 Building the C6 
Chapter 7: C6 Shift Kits
 Installing a TCI Trans-Scat 
Chapter 8: Torque Converters 
 A Bit of History 
 Torque Converter Function 
 Choosing a Torque Converter 
Chapter 9: Removal and Installation 
Appendix
 Source Guide