Muncie also had a second close-ratio transmission coded M22 and known as the "rock crusher," which was used behind performance big-block engines and in some Corvettes. These M22 units are highly sought-after for performance applications. The term "rock crusher" refers to the noise made by the meshing of the stronger helical gears in …
Times and requirements have changed making both the M21 and M22 the closest ratio production 4 speeds ever produced but also not practical for today's driving habits unless road racing is your thing. The new Muncies being built today have some better ratios.Today's examples of the new car gear set ups are Mustang GT's with a 3.35 1st …
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 I'm thinking it could be a M22- realize ...
from Southern Ok. ""You can outfit an M20 or M21 with Rock Crusher type gears, OR actually make a 3 speed O/D out of a 4 speed case. Forth being the overdrive obviously.. Actually the 3rd gear station becomes the OD and the 4th gear station becomes 3rd,so the shift pattern is a little d,1-2-4-3.
Just three types of Muncie 4-speeds are available based on the RPO (regular production option) code used when a car was ordered: the M20 (standard wide-ratio), M21 (close-ratio), and M22 (heavy-duty close-ratio).
The biggest disadvantage to the M22 is that first gear is ssssoooo tall; even with a 4.11 gear it's tall and any rear gear in that range is miserable on the freeway. That's where the TKO shines. It has a much lower first gear and fifth is 33% overdriven so you can have a low rear gear for good acceleration and still get on the freeway without ...
The M22 "Rock Crusher" followed four years later. It uses stronger components to handle big-block power. ... However, GM made both 10- and 26-spline versions of the M20 and M21. There are two ways you can tell the difference between the M21 and the Rock Crusher. The M22 has 27 teeth on the countershaft gear, while the M20 and M21 have …
All rock crushers can be classified as falling into two main groups. Compressive crushers that press the material until it breaks, and impact crushers using the principle of quick …
The M22 transmission has a 20 degree helix angle on the gear set as opposed to a 45 degree angle found on the M20 and M21 and were made with a higher nickel alloy. The straighter angle was designed to produce …
M22 is better, but not dramatically so. All have angle cut gears, the M22 has lesser angles to the gears than the M20/M21 gears is all. View this. The 764 extension …
An M-22 "Rock Crusher" is a Muncie four-speed transmission for cars made by General Motors in the 1960s. Identify a transmission type correctly before fitting it into your car. If you have the incorrect transmission, your …
05. If your Muncie is anything like ours, a thorough cleaning is the first step in the rebuild process. Ours had years of accumulated oil and dirt. We recommend using some sort of product that ...
Fodrea was the GM engineer whose name is listed on the design patent for the Muncie. Although he is seen with a 1957 Corvette, which came with a T10 4-speed, the design of the T10 and Muncie share the same features. This is how the Muncie countergear's design evolved. The center gear is from a BorgWarner T85 3-speed.
The first time I heard the term "rock crusher" was in reference to the transmission in the 1967 L88 Corvette. Due to the low gear angle there is a fair amount of gear noise, really like a medium / heavy duty truck transmission. True enough the M22 did trickle out the door in 1965-67 and was buried in the option lists.
Like grooves in the input shaft and numbers and etc etc... The only way to tell is to open the case and measure the gear angle from the shaft centerline. M-20 and M-21 have 45 degree gears and M-22 have 22.5 degree gears. Fresh M …
It tells how to pick out what is what but the main thing to look for in a M-22 is the gear angle. Take off the side cover and look at the angle of the gears. M-20, m-21 will have 45 degrees gears and the m-22 is …
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.
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. ... If I were to purchase a rebuilt M22 with the proper maincase/tailshaft/cover stampings what is the market price. I have located 2 and 1 source was asking $ 2500 …
The L72 was the top dog engine for 1968 full-size Chevys, sporting serious hardware throughout. 425 horses were the result of 11:1 compression, a healthy solid-lifter cam, aluminum high-rise intake, 780-cfm Holley, and more. This L72 is not the original for Paul's Biscayne, but is date code correct. Photo by Eric English.
It remains to be seen if the M22 gears are still in there though. Your friend isn't as much of an expert as he thinks. The case will be a 661 casting, and,if original, will have a 764 tail housing and 32 spline main shaft. 1966 Charger (383, 727 Torqueflight) 1970 SS 454 Chevelle (LS5+2, M22, 3.31 12 bolt) 1971 Malibu (350, M22, 3.31 12 Bolt ...
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 …
Muncie Parts > NEW Muncie M22 SUPER ROCK CRUSHER 4 speed $2899.00. NEW Muncie M22 SUPER ROCK CRUSHER 4 speed $2899.00. View Images. Price: No Price: Sale Price: No Price: Availability: in stock Prod. Code: AGM22: CURRENTLY UNAVAILABLE UNTIL SPRING-TAKING ORDERS. $2899.00 PLUS S/H + ASSEMBLY …
Thus, bottom line, ONLY the M22 is "properly" nicknamed as "Rock Crusher". And, some people, who just flat do not know what they are talking about …
How to Identify a M22 Rock Crusher. An M-22 "Rock Crusher" is a Muncie four-speed transmission for cars made by General Motors in the 1960s. Identify a transmission type …
If your sure its a real M22, its a pretty rare transmission. THey go for about $800-1200 on EBay depending on condition. I know because I was once looking for on until I got a Borg warner instead. If its an M22, the input shaft should have no rings on it and the spline count should be 26. They are nice transmissions.
Rest of ID 1 42249 makes sense with warranty engine numbering scheme; 1 would be the production year of the transmission and 42249 would just be the serial number of the transmission. As Mike noted, the part number and broadcast code is on the metal tag, 3978766 is a 1970 M22 and WO is the broadcast code found on the build sheet.
M22 transmissions can only be identified removing the selector cover(side cover) and visually identifying the straight cut gears-all other muncie transmissions had conical cut(angle) gears. The most well …
The M20 and M21 have the same cut to the gears, the M22 is a straighter cut resulting in a greater strength. Since the M20 and M21 look the same one way to tell them apart (aside from the grooves on the input shaft) is the tooth count on the cluster gear. There are 7 different input shaft possibilities on a Muncie.
Code: New Muncie M22 2.20 close ratio or 2.52 wide ratio Rockcrusher gear set is availabe with either a 10 or 26 spline input. Close ratio 26 spline gear sets available in Italian or Korean made. You must select whether you need a wide or close ratio & which input spline count, 10 or 26. Fits all Muncie applications with 1" countershaft pin ...
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 shaft that requires a T-400 driveshaft yoke. ...
The M-21 close ratio and M-22 close ratio heavy duty ratios are: 2.2:1, 1.64:1, 1.27:1, and 1:1. Reference: Corvette Black Book, and 1969 Owners Manual. This is correct. The M20 is a wide box with a 2.52 1st gear and the M21 and M22 are close ratio with a 2.20 1st gear.
STRONGEST Direct Replacement M22 With NEW Muncie AUTO GEAR ULTRA CASE With The Strongest M22z ULTRAWIDE RATIO 4 SPEED TRANSMISSION. A GREAT HEAVY DUTY ROCKCRUSHER FOR YOUR CAMARO, NOVA, CHEVELLE, CORVETTE, GTO,442. THE MAIN CASE IS THE STRONGEST MADE with fill and drain plugs. C355 …
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.
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 …
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 …
M22 Rock Crusher. Jump to Latest Follow ... AS STATED ABOVE-----THE ONLY, ONLY, ONLY, ONLY WAY TO TELL A M-22, IS TO REMOVE THE SIDE COVER AND LOOK AT THE ANGLE OF THE GEAR TEETH! If you don't know what that angle should look like, put an old Muncie gear in your pocket and take it with you to compare …
Joined Aug 27, 2004. 4,959 Posts. #21 · Oct 30, 2008. I love hearing this info from Tom and Jody. Real good info. I have the Autogear M22W in my 71 with 3.55 rear since early this year. I have no complaint. Works excellent with the 3.55 gear, and the whine it makes in 1 st, 2 nd and 3 rd causes the goosebumps to bleed, its awesome !!!!!
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
