Over the last 50 years, literally millions of GM cars and trucks have been built with Turbo 400 automatic transmissions. While these transmissions are respected for their durability and versatility, there always comes a point where the old transmission shows signs of wear. At some point, even the best transmissions need to be rebuilt.

Respected automotive technical author Cliff Ruggles takes readers through the complex rebuild procedure of GMs most popular rear-wheel drive automatic transmission in this great new book. Enthusiasts have embraced the reliable GM Turbo Hydra-Matic 400 three-speed automatics for years, and the popularity of these transmissions is not slowing down. With his proven style, Ruggles walks through the step-by-step rebuild and performance upgrade procedures in a series of full-color photos for each of these models. Time saving tips are part of every buildup.

This is a welcome addition to your automotive library. Amateurs and professionals alike will appreciate the advice and guidance offered on every page. Even if you end up deciding to have a professional take care of your transmission repair and performance needs, this information is crucial to understanding how the power gets from the engine to the road.

Chapter 1: Tools and Equipment 
 Safety Equipment 
 Sockets and Wrenches 
 Snap Ring Pliers 
 Screwdrivers 
 Measuring Devices  
 Spring Compressors 
 Case Holding Fixtures  
 Work Surface 
 Pans for Small Parts 
 Cleaning Cases  
 Bushing Removers and Installers 
 Heli-Coils and Bolt Extractors 
 Air Tools  
 Punches, Chisels and Files  
 Lip Seal Installation Tools 
 Friction Alignment Tool 
 Oil Pump Band 
 Alignment Studs 
 Slide Hammer 
 Special Tools 
   
 Chapter 2: Transmission Fundamentals 
 Torque Converters 
 Transmission Oil Pump 
 Clutch Packs 
 Bands and Servos  
 Accumulators 
 Planetary Gears  
 Sprags and Roller Clutches  
 Valve Body 
 Chapter 3: Transmission Removal 
 Chapter 4: TH400 Disassembly  
 Remove External Components  
 Remove Valve Body and Governor Filter 
 Remove Downshift Solenoid and Separator Plate  
 Remove Front Band and Low Band Apply Servos 
 Remove Oil Pump, Manual Shaft and Speedometer Gear Housing 
 Remove Forward Drum Clutch, Direct Drum and Band  
 Remove Clutch Pack, Output Shaft and Low Band 
 Final Disassembly 

 Chapter 5: TH400 Assembly  
 Install New Case Bushing, Solenoid Connector and Parking Pawl 
 Disassemble Output Shaft and Lower Planetary Assembly 
 Reinstall Planetary Assembly  
 Install Low Band and Output Assembly 
 Rebuild Center Support 
 Reinstall Center Support 
 Rebuild and Install Clutch Pack and Intermediate Band 
 Rebuild Direct Clutch Pack and Install Direct Drum 
 Rebuild Forward Drum 
 Rebuild and Install Oil Pump Assembly 
 Check Clutch Packs and Install Accumulator Piston  
 Install Filter and Valve Body 
 Install Exterior Components 
 Chapter 6: TH400 Transbrake 
 Installation Procedure 
   
 Chapter 7: Transmission Installation 
   
 Troubleshooting Guide