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 How to Rebuild and Modify Muncie 4-Speed Transmissions
How to Rebuild and Modify Muncie 4-Speed Transmissions

How to Rebuild and Modify Muncie 4-Speed Transmissions

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How to Rebuild and Modify Muncie 4-Speed Transmissions
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The Muncie 4-speeds (M20, M21, and M22) are some of the most popular manual transmissions ever made and continue to be incredibly popular. The Muncie was the top high-performance manual transmission General Motors offered in its muscle cars of the 1960s and early 1970s. It was installed in the Camaro, Chevelle, Buick GS, Pontiac GTO, Olds Cutlass, and many other classic cars. Many owners want to retain the original transmission in their classic cars to maintain their value.

Transmission expert and veteran author Paul Cangialosi has created an indispensable reference to Muncie 4-speeds that guides you through each crucial stage of the rebuild process. Comprehensive ID information is provided, so you can positively identify the cases, shafts, and related parts. It discusses available models, parts options, and gearbox cases. Most important, it shows how to completely disassemble the gearbox, identify wear and damage, select the best parts, and complete the rebuild. It also explains how to choose the ideal gear ratio for a particular application. Various high-performance and racing setups are also shown, including essential modifications, gun drilling the shafts, cutting down the gears to remove weight, and achieving race-specific clearances.

TABLE OF CONTENTS:

Acknowledgments 
Introduction 
What is a Workbench® Book? 

Chapter 1:
  • History and Evolution 
  • Happy Accidents Create the Muncie 
  • Muncie Design Changes 
  • Available Gear Ratios 
Chapter 2:
  • Muncie 4-Speed Identification 
  • Muncie RPO Codes 
  • Main Case Casting Numbers 
  • Serial Numbers 
  • Main Cases 
  • Service Cases and Transmissions 
  • Extension Housings and Sidecovers 
  • Midplate Castings 
  • Ratio Identification 
  • Hardware and Tags 
Chapter 3:
  • How Muncie 4-Speeds Work 
  • Forward Gears 
  • Reverse Gears 
  • Lack of Front Seal 
  • Design Features 
  • Diagnosing Common Problems 
  • Shifter Considerations 
  • Chapter 4: Inspection and Repair 
  • Cleaning  
  • External Case Components  
  • Gears, Synchros and Shafts 
  • Bearings and Bearing Surfaces 
  • Chapter 5: Rebuilding Your Muncie 
  • Muncie Rebuild Kit 
  • Workflow Process 
Chapter 6:
  • High-Performance Muncies 
  • Auto Gear Equipment 
  • High-Performance Gearsets 
  • Muncie Design Features 
  • Road Racing and Endurance Use 
Chapter 7:
  • Advance Adapters 4x4 Conversion Kit 
  • Mainshaft Assembly 
  • Maindrive Inspection 
  • Gearbox Assembly 
Chapter 8:
  • Parts Resources 
  • Group A: Mainshaft and Extension Housing 
  • Group B: Maindrive and Retainer 
  • Group C: Countershafts and Case 
  • Group D: Internal Shift Linkage 
  • Group E: Service Kits 
Appendix:
Original Muncie Patent 
Source Guide
Specifications
Publisher: CarTech, SA Design
Softcover: Approx. 144 pages
Dimensions: 10.8 x 8.3 x 0.3 inches
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