How To Identify Chevy Four-Speed Transmissions
The Muncie four-speed was produced in two ratios: the wide ratio (M20) and the close-ratio (M21). That being said, there was a second, close-ratio version (M22) that was developed to survive duty behind engines with a higher …
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Muncie Calendar Date Codes — D.M.E. Transmissions
1969-1974 codes include a suffix letter at the end to aid in identification of transmission ratios. A = 2.52 1st gear wide ratio M20, B=2.20 1st gear close ratio M21, C = 2.20 first gear Rock Crusher M22. One example code would be ( P0E21 A ) which reads: Muncie four speed aluminum for passenger car, 1970, May, 21st, ratio M20. Just For You.
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Muncie I.D. chart
Although some claim that the M23 is a 'rock crusher', it is indicated that this box was assembled in both wide and close ratio components and also with straight cut gears common to the rock crusher (M22) transmission. This chart, so far, has been very accurate in identifying the muncie trans. over the years, so I wanted to share.
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sbm/sbm how to identify an m22 rock crusher …
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Help Identify Muncie M20, M21 or M22
Look at the clutch gear, where the clutch slides on. If it's got 10 splines and 2 grooves cut around its circumference, it's a M-20. If it has 10 splines and 1 or no grooves, it's a …
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How to Identify a M22 Rock Crusher
You can identify several unique signs that identify an M-22 "Rock Crusher," even if it does not have a GM hallmark imprinted on its surface. Step 1 Check the casting number, the production year and the gear ratios on the aluminum serial number plate attached to the transmission box.
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Muncie 4 Speed Transmissions
The straighter angle was designed to produce less end loading of the gear train and less heat but created more noise, thus the nickname "rockcrusher". The higher nickel alloy allowed for more …
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** 3 Speed Close Ratio Transmission Gears
These apply to 1955-61 Corvettes and 1955-57 Passenger Chevy's I believe. ... this is the same issue with the Muncie Rockcrusher M-22 four speeds with the 2:20 first gear. On a low powered car, you end up with a slug off the line (traffic lights, stop signs, or just from a stop) and the reduction in gear multiplication is too much. When that ...
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Complete Guide to Muncie Transmissions
The M22 Rock Crusher would come later to accommodate the heavy twist of Chevrolet's big-blocks in the mid-1960s. The M20 and M21 transmissions produced from 1963-'74 are easy to identify in both wide- and close-ratio units.
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Muncie Identification
Muncie Identification. Jump to Latest ... It's not a RockCrusher, here is the difference in gear tooth angles between standard and crusher: The steeper angle on the left is standard, the lesser angle on the right is RockCrusher. ... A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. Come join the discussion ...
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The Story of the Mighty & Majestic Muncie 4 Speed …
The Muncie name comes from the plant it was created in in Muncie, Indiana. This transmission manufacturing facility has been in operation since 1902 and was officially purchased by GM in 1920 under the name Muncie Products to manufacture transmissions and steering gear for their Oakland, Pontiac, Oldsmobile, Chevrolet, and GMC-Truck divisions.
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GM Muncie 4-Speed Decoding
M-22 "Rock Crusher" Identification. The M-22 close-ratio transmission is easily identified internally from the M-20 and M-21 versions by the angle of the gear teeth. The M-22 was only produced in a close-ratio version, so it will not …
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How to tell difference between M20 and M21
A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Show Less . Full Forum Listing. Explore Our Forums.
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M20 M21 M22 how can you tell
M22's were made in both course spline and fine spline inputs. Now here's the problem. Chevy built a transmission in the early 70's that has the big output shaft and the lower drain plug, without the big gears. ... and look at the gears. The M22's are wider and much closer to straight cut (resulting in the noise and the nickname rockcrusher ...
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Muncie 4 Speed Transmissions
How to Identify Muncie 4 Speed Transmissions. Identifying Muncie 4 Speeds II by Paul Cangialosi : ... thus the nickname "rockcrusher". The higher nickel alloy allowed for more impact of the gears. Another misconception is if you have a drain plug you have an M22. Again this was only true when the first M22 boxes were created.
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Technical
Technical Muncie 4 speed identification. Discussion in 'The Hokey Ass Message Board ... to my transmission guy to check it out and, yep, no rebuild. But the really great news was that it was actually a M22 Rockcrusher …
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Chevy Transmissions: Muncie 4 Speed M22 Rockcrusher..
"Where Our Customers Send Their Friends" Chevy Transmissions: Muncie M22 "Rock Crusher 4 Speeds were made From 1965 TO 1974: The most popular transmission of it's time for high performance cars built for Chevrolet and all performance oriented G.M cars.They have the same gear ratios as the legendary M21 but with a heavy duty gearset.
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Chevy 350 Engine Block Identification Numbers
How to Identify Chevy 350 Engine Block Numbers. Chevy 350 engine block identification numbers are generally found in several key locations: Casting Number: This number is typically located on the rear of the engine block, near the bell housing. It is a 7-digit number that indicates the engine's production year, plant of manufacture, and ...
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How to Identify Your Muncie 4-Speed Transmission
M22: Known as the "Rock Crusher", designed for high-torque applications. Using these tips, you can confirm whether you have the right transmission for your Chevy and make …
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M-22 "rock crusher"
ORIGINALLY, in the beginning of the Muncie evolution, there was the M20(wide ratio) and the M21(close ratio). A VERY, VERY, VERY few Heavy Duty, close ratio Muncies were specially built for severe duty service (such as for the 425hp/396 Corvettes) in 1965. THEY WERE NOT CALLED M22 IN 65-----they were simply a Heavy Duty close ratio Muncie..
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Identifying Muncie 4-Speeds
Identifying Muncie 4- Speeds. Several things are needed to identify a Muncie correctly. The first is a main case casting number. Second a count of the input shaft and output shaft splines and if any rings or grooves exist around the input shaft splines. Third are date codes and VIN numbers that help confirm that the above case and gears belong together.
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Muncie 4 speed....M21, M22, Rock Crusher? | The H.A.M.B.
I was just wondering how many different variations there are of the Muncie 4 speed and which ones are best and for what reason(s). I currently have an M22 Rock crusher in my '56 Chevy pickup, and have another M22 that was rebuilt about 6 years ago by my father but never used. I also have what I believe is an M21, but I'm not certain.
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GM Muncie 4-Speed Decoding
M-22 "Rock Crusher" Identification. The M-22 close-ratio transmission is easily identified internally from the M-20 and M-21 versions by the angle of the gear teeth. The M-22 was only produced in a close-ratio version, so it will not appear on models with high rear-axle ratios (3.55 or lower numerically) unless someone has changed it.
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The Muncie 4 Speed Transmission Taught A Generation Of …
The Muncie earned its keep by offering a better shifting experience than any other gearbox to date from Chevrolet, Pontiac, Oldsmobile, and Buick. It was no accident, either: the 4-speed was the product of careful engineering intended to modernize GM's transmission offerings, and it benefited from continual updates during its decade-long run as ...
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Chevrolet Chevy Manual Transmission Identification and …
The M-20 wide ratio, the M-21 close ratio, and the "Extra heavy duty close ratio" M-22, also known as the "Rock Crusher". The M-22 was generally installed behind severely powerful (high …
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Muncie 4-Speed Identification Guide
These are usually the first numbers used to start the identification process. This is Brian Higgins of the SK Tranny Shop. Shops like this are a great place to research castings and part numbers. ... The Muncie case (3831704) replaced the T10 4-speed in the 1963 Chevrolet Bel Air and Corvette by mid-May of that year. The T10 front bearing size ...
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How to Build a Bulletproof Muncie M22 Four-Speed …
If you've ever driven a classic muscle car equipped with a four-speed manual transmission, you probably experienced the joys of commanding a Muncie Rock Crusher. Some classic 1960s General Motors ...
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Muncie 4-Speed: The Complete History
In 1964 and 1965, Muncies in some of the full-size Chevrolet Impalas and Pontiac Catalinas were equipped with longer mainshafts and extension housings to keep driveshafts shorter and reduce harmonic vibration. M22 RockCrusher . In 1963 the Corvette Grand …
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Chevrolet Chevy Manual Transmission Identification and …
Further Muncie identification 3 Muncie 4 speeds were offered. The M-20 wide ratio, the M-21 close ratio, and the "Extra heavy duty close ratio" M-22, also known as the "Rock Crusher". The M-22 was generally installed behind severely powerful (high torque) big-block engines. The M-22 is distinguished from an M-21 by the angle of the gear teeth.
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Help Identify Muncie M20, M21 or M22
This is not true. An M22 gearbox has a 20 degree helix angle on the gearset as opposed to a 45 degree angle. Also M22 gear sets were of a higher nickel alloy. The straighter angle was designed to produce less end loading of the gear train and less heat but created more noise, thus the nickname "rockcrusher".
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