The 2561 ratio is commonly referred to as the M20. The Muncie four-speed transmission was used with many different models and engine combinations from 1963 through 1974.
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The parts resource guide lists two major diameter drive gears.
M20 muncie 4 speed. Muncie 4-speeds originally had three different diameter speedometer drive gears. Easily identified by the reverse gear being on the main case instead of the tail housing. There are three basic types of Muncies.
220 to 1 and 256 to 1. The early production Muncie four-speed case is the small-bore unit and can be identified by the GM casting number 3831704 see Muncie M20M21M22 Main Case Identification chart. Therefore the Muncie patent is basically a design for the layout of a 4-speed transmission.
The early production Muncie four-speed case is the small-bore unit and can be identified by the GM casting number 3831704 see Muncie M20M21M22 Main Case Identification chart. And youre right Zack not too many people actually know how to distinguish. Each unit starts with a completely new gearset and all internals blueprinted by us.
One of the most common swaps involves a Muncie 4-speed. M20 M21 and M22. These have a 10 spline input and 27 spline output.
The M20 standard wide-ratio M21 close-ratio and M22 heavy-duty close-ratio. These have a 10 spline input and 27 spline output. Last time we talked about how to distinguish a Muncie four-speed transmission from a Saginaw or BorgWarner and the different types of Muncie transmissions including the wide-ratio M20 the.
Muncie RPO Codes Just three types of Muncie 4-speeds are available based on the RPO regular production option code used when a car was ordered. The case extension midplate shift cover are all original parts and are restored with our proprietary system to as new condition. These quality M20 manual transmission parts rebuild and overhaul kits are designed to be top of the line overhaul kits.
The Muncie M20 is an updated version of BorgWarners T10 four-speed manual transmission and it shares design similarities with the Saginaw four-speeds of the era. The internals are installed in the Supercase iron midplate and heavy duty tail. Early 64-68 side plate.
The new Muncie style 4 speed even in base form is a huge improvement over factory units. The Muncie four-speed transmission was heralded by many as an indestructible four speed used by General Motors and found its way into many different car models behind various engine combinations between 1963 and 1974. Muncie 4 speed transmission wide ratio M20 with 2 rings on the input shaft main case number 3925660 side cover number 3884685 tail shaft number 3846429.
The M does not stand for Muncie. 1 product rating - 2----- 1964 - 1969 Chevrolet M20 4 Speed Muncie Transmission ID Tags you pick. The proper Hurst Competition Plus system for a 1966-1967 Saginaw is shifter 3917307 and installation kit 3734297.
When asking about this transmission put Trans number 4 in message. 176 and 184 inches. Muncie 4 speed transmission wide ratio M20 with 2 rings on the input shaft.
A Muncie differs from a Saginaw transmission in that its reverse lever is in the tail housing not the side cover. 3831704 - 1963 only 3851325 - 1964-65 3885010 - 1965-67 3925660 - 1968-70 3925661 - 1971-74. Muncie Four Speed casting numbers identify all aluminum Muncie main cases.
Muncie also had a second close-ratio transmission designated M22 and often referred to as the rock-crusher which was used behind the highest-performance engines and in Corvettes the M22 is a highly sought-after performance transmission. We have include information on how to identify individual transmissions application information model year detailed kit and part availability by transmission type. The Saginaw 4-speed transmission was also used and shown for M20 PROD V-8 ENG RPO.
Muncie M20 4 Speed RWD Manual Transmission Parts. The 2201 ratio is commonly designated as the Muncie M21 transmission. To save costs and development time Chevrolet used the T10 as a base design adding stronger components and larger synchro cones.
These are easy to adapt to a wide range of hot rods. It debuted in 1963 Chevrolet full-size cars and Corvettes and was originally available with two first-gear ratios. If you are not sure how to distinguish between an M20 M21 or M22 Muncie knowing what to look for can.
This layout is a 4-speed transmission with four forward gear ratios in the main case a midplate bearing support and a reverse gearset in the extension housing. All Muncie transmission cases are made of aluminum and the identifying casting numbers are prominently stamped in the passenger side of the transmission case. Even after 45 years the Muncie four-speed is still a very popular transmission with Chevrolet muscle car enthusiasts and it is easily adaptable to a wide range of GM and other non-GM vehicles.
The unit is buttoned up with a new side cover assembly and forks. The six-tooth gear no longer available had no driven-gear options except for one steel 20T pencil gear. M20 wide ratio or M21 Close Ratio Muncie 4 speed.
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