How does a Muncie 4 speed work?
How does a Muncie 4 speed work?
The Muncie 4-speed is a constant-mesh transmission. This means that all the gears in the transmission, except for reverse, are always meshed together and spinning, even in neutral. These detents function as interlocks, preventing any two forward-speed gears from being shifted at the same time.
Where is the Muncie 4 speed transmission located?
‘Muncie’ 4-speed Manual transMission asseMBlies, Gears & parts HiGH perForMance 1963–1974 AUTO GEAR EQUIPMENT AUTO GEAR EQUIPMENT 530 State Fair Boulevard, Syracuse, NY 13204 (800) 634-3001, Inside New York: (315) 471-8141 Fax Numbers: (315) 471-8146 or (800) 537-4213 Email: [email protected]
Where is the con Vin on a Muncie 4 speed?
Most transmissions since 1962 will also have a CON VIN (concealed or confidential VIN, whichever term one likes) stamped in the case generally along the top ridge or even on a mounting surface such as the flange mounting the tail shaft to the main case noting the original car it was installed in.
Where are the casting numbers on a Muncie transmission?
All Muncie transmission cases are made of aluminum, and the identifying casting numbers are prominently stamped in the passenger side of the transmission case. Muncie Four Speed casting numbers identify all aluminum Muncie main cases: 3831704 – 1963 only 3851325 – 1964-’65 3885010 – 1965-’67 3925660 – 1968-’70 3925661 – 1971-’74
What was the transmission ratio for the GM Muncie?
The Muncie’s appearance, design, and operation did not change much during the transmission’s use in GM production cars. However, there were several design upgrades and modifications made during the total production run. The Muncie four speed was produced in two ratios: the wide ratio (M20) and the close-ratio (M21).
Is the Muncie 4 speed made by General Motors?
Auto Gear’s “Syracuse 4-speed” is a Muncie on steroids. General Motors received royalties for every T10 sold from BorgWarner, so you have to wonder why they would bother making their own 4-speed at the Muncie plant. It appears that BorgWarner had an exclusivity contract with General Motors until 1960.
Where is the casting code on a Muncie 4 speed?
Many Muncie 4-speed main cases, extension housings, and side covers have a casting date code. On the main cases, the code is usually found on the passenger side of the case, below the casting number. The extension housing code is usually within a few inches of the casting number, also on the passenger side.
Why did Chevy change the transmission on the Muncie?
When designing transmissions you have to remember that as vehicles change dynamically (increased horsepower, weight, or gas mileage requirements) the transmission also has to change. Because the Muncie was well engineered, there was room for improvement to the base design.
How can I find the VIN on my Muncie 4 speed?
A service technician can use a scanner to find a VIN, and any known service issues are easily found. From the 1960s until the late 1980s General Motors issued Technical Service Bulletins by mail or fax to alert dealerships of potential service issues. I’m not a fan of these but I do understand their importance.
