|Название||Muncie 4-Speed Transmissions|
|Автор произведения||Paul Cangialosi|
39966 Grand Avenue
North Branch, MN 55056
Phone: 651-277-1200 or 800-551-4754
© 2014 by Paul Cangialosi
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Edit by Paul Johnson
Layout by Chris Fayers
Item No. SA338
State-of-the-art replacement Muncie case components and gears set a new standard for rebuilding an old, worn-out Muncie 4-speed.
This is a completed SPEC-25. The special Teflon coating reduces internal friction and heat: The exterior becomes a non-stick surface and gasket surfaces clean up very quickly. Plans are in the works for new-style NASCAR synchro assemblies and more ratios, so a SPEC-35 will most definitely be in the future!
Back Cover Photos:
Usually the gear and 3-4 synchro hub dislodge if you hold third gear and gently tap on the front of the mainshaft. Later units have hardened hubs with extremely tight press fits, and you must use a press to remove them. If the gear and hub do not come off, do not use a hammer to try to remove them. The tip of the mainshaft is easily damaged. Use a press and bearing clamp on third gear for removal.
Lift the countergear out of the case. If the case was damaged from a gear explosion, the thrust washers are often jammed from debris. If that has happened, stand the case on its front face, so that the loose gear doesn’t cock or move off center, and rotate it as you remove it.
The bronze synchro ring has a 6-degree internal taper that matches the taper on the gear’s synchro cone. As it is forced up against the cone, it eventually causes the output shaft to run at the same speed as the gear. It’s essentially a cone clutch.
I never press directly on gear surfaces. The lower gear has an old bearing race against it. This grabs closer to the inside diameter of the gear to prevent press-surface contact with the gear teeth.
Chapter 1: History and Evolution
Happy Accidents Create the Muncie
Chapter 2: Muncie 4-Speed Identification
Service Cases and Transmissions
Extension Housings and Sidecovers
Hardware and Tags
Chapter 3: How Muncie 4-Speeds Work
Lack of Front Seal
Diagnosing Common Problems
Chapter 4: Inspection and Repair
External Case Components
Gears, Synchros and Shafts
Bearings and Bearing Surfaces
Chapter 5: Rebuilding Your Muncie
Muncie Rebuild Kit
Chapter 6: High-Performance Muncies
Auto Gear Equipment
Muncie Design Features