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.
Chevy Manual Transmission Identification
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.
Muncie 4 Speed Transmissions
Muncie 4 Speed Transmissions. Identifying Muncie 4 Speeds III by Paul Cangialosi. The most popular question has to be that everyone thinks they have the famous "rockcrusher" M22 4 speed. This had the same gear ratios as the …
Help Identify Muncie M20, M21 or M22
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 original post said "without pulling it from the vehicle" Thus the request for any/all numbers on the trans to Help identify it. After 35 yrs, anything could have happened to these tranys.
How to Identify a M22 Rock Crusher | Cars DIY
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. Promoted by Check the casting number, the production year and the gear ratios on the …
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.
Muncie four-speeds | The Online Automotive Marketplace
The 2.56:1 ratio is commonly referred to as the M20. 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. It is the heavy-duty version of the 2.20:1 ratio ...
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 …
How to Rebuild a Muncie Four-Speed Transmission
The Muncie four-speed is as legendary as the cars that it was put into, with the M20, M21, and Rock Crusher M22 models all part of the hot rod vernacular. From the OEM factories to racetracks to ...
Muncie I.D. chart | Chevy Tri Five Forum
C-M22 MODEL IDENTIFICATION(1969-1972) A-M20 B-M21 C-M22 ... The most well known Muncie transmissions are the M20(wide ratio), M21(close ratio), and the M22(rock crusher). Although not mentioned much, there was also an M23 transmission that was used, beginning in 1970. The M23 is recognized by a 26-spline(fine) input shaft and a large output ...
Auto Gear Upgraded Ultra Case M22Z Rock Crusher 4 …
Garry Brown on Super Pro Road/Race Muncie Upgraded Ultra Case M22 Rock-Crusher. SALE EXTENDED!!! Michael wilhelm on Auto Gear Upgraded Ultra Case M22Z Rock Crusher 4-speed. Perfect Performance with 2.73 to 3.42 Rear End Gears. SALE EXTENDED!!! Ricky Fitts on Muncie Super Duty M23 Upgraded Ultra Case 4-speed Road or Drag Racing Rock-Crusher ...
Technical
Technical Muncie 4 speed identification. Discussion in 'The Hokey Ass Message Board' started by ... M-22 Rock Crushers have gone up boocoo bucks since then.. ... it to my transmission guy to check it out and, …
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.
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.
M22 Rock Crusher
C3 General - M22 Rock Crusher - Just bought a 1968 (originally was 427/435..currently has a CE replacement block from 69)) and I believe it has a M22 vice M21. Intent at some point in the near future is to crawl under and check numbers/code. I know it has the factory 411 rear end (Code FB) so that is the first reason...
How to Identify a Muncie Four Speed
There also was a second, heavy-duty close-ratio version: the "Rock Crusher" (M22) that was offered on some of the high-performance big-block models, starting with the 1965 Corvette.
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.
M21 M22 4 Speed Muncie Manual Transmission
Below we provide a M21 & M22 parts illustration to assist you with the correct identification of the parts you need. Select the parts you require from the following list and give us a call. ... Rebuilt Transmission M22 1966-1974 Rock Crusher MTGM038. Rebuilt Overhaul Bearing Kits M21 & M22 Transmission. Kits w/OE Style Bearings.
Midwest Muncie | Muncie 4 Speed Transmissions And …
John DiLauro on Auto Gear Upgraded Ultra Case M22Z Rock Crusher 4-speed. Perfect Performance with 2.73 to 3.42 Rear End Gears. SALE EXTENDED!!! Garry Brown on Super Pro Road/Race Muncie Upgraded Ultra Case M22 Rock-Crusher. SALE EXTENDED!!! Michael wilhelm on Auto Gear Upgraded Ultra Case M22Z Rock Crusher 4-speed. Perfect …
GENERAL MOTORS MUNCIE 4-SPEED MANUAL …
L30-s36T: except M22 3831746 WT297-21 L30-s36T: M22 'Rock Crusher' 3879999 WT297-21A A17 Mainshaft 3rd Gear L27-s36T: except M22 3831747 WT297-11 L27-s36T: M22 'Rock Crusher' 3880845 WT297-11A A18 Mainshaft 3rd/4th Synchronizer Assy synchro rings w/o support shoulder (1963-65) 3887887 3887887
Muncie 4-Speed: The Complete History
This is the current Muncie M22. Your can see that the layout of the geartrain is identical to the ST10's. All gears and synchronizers are in the same position. Notice how the angle of the M22 gears is much straighter than on the ST10. …
New Auto Gear Upgraded Ultra Case Muncie HD …
John DiLauro on Auto Gear Upgraded Ultra Case M22Z Rock Crusher 4-speed. Perfect Performance with 2.73 to 3.42 Rear End Gears. SALE EXTENDED!!! Garry Brown on Super Pro Road/Race Muncie Upgraded Ultra Case M22 …
The 1965 Chevrolet M22 Rockcrusher …
Across the top of the page are the words "First Build 4/15/65 – 1st Shipment 4/19/65, recap of M22 (Rock Crusher) Trans." By comparing these M22 transmission assemblies to Chevrolet's 1965 transmission …
Muncie 4-speed
The M22 was produced in 1973 and 1974 for other GM divisions. ... thus the nickname "Rock Crusher" was born. Another misconception is if you have a drain plug you have a M22. ... Transmission Identification. 1964 to 1968 Muncie 4-speed transmissions can be identified from later models by the way the transmission arms attach. Early Muncie side ...
How to Build a Bulletproof Muncie M22 Four …
The Muncie M22 is known as the Rock Crusher. See how we improve its strength and versatility by adding a Gear Vendors Overdrive. Cam Benty Writer John McGann Photographer Nov 04, 2022.
Muncie 4 Speed Transmissions
How to Identify Muncie 4 Speed Transmissions. Identifying Muncie 4 Speeds III by Paul Cangialosi : The most popular question has to be that everyone thinks they have the famous "rockcrusher" M22 4 speed. This had the same gear ratios as the M21 but with a heavy duty gearset. ... Top countergear is an M22. Lower gear is an M20. Notice the ...
The 1965 Chevrolet M22 Rockcrusher …
By comparing these M22 transmission assemblies to Chevrolet's 1965 transmission identification codes, I found a perfect match. This transmission identification code list was issued by the Chevrolet Facilities and Product …
Guide to Muncie M20, M21, and M22 Four-Speed …
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 …
M22 Identification
Can you help identify if it is truly an M22. The number reads 3925856(or possibly 3925858) All the sites I have visited are telling me the case number should be 3925661/ ... Doe this mean it's still an M22 but just manufactured at the Saginaw assembly plant or it's not an M22 "Rock Crusher Transmission". I am just learning ! Save Share