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Muncie 4-speeds were produced in two different ratios wide ratio (M-20) and close-ratio (M-21). An extra heavy duty close-ratio version (M-22) was also offered on many of the big-block high-performance models.The choice of transmission was dictated by the engine size and rear-axle ratio. Axle ratios of 3.73 and lower (numerically higher) came ...
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Why is the Muncie M22 called the rock crusher? Carolina. Published: May 23, 2023. Sharing is Caring. The reduced gear angle of the M22 created a problem with noise (hence the name "rock-crusher"). Performance seekers decided to live with the noise when the benefits of increased durability from the gear-tooth angle outweighed the …
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Put the transmission in 2nd gear and remove the side cover to view the helix angle of the gears and the condition of the synchro engagement teeth. Fair market value could be as much as $1500-1600 as a rebuildable M22 "core". They do demand a premium.
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I started out with Pontiacs in the late '70s, and moved into Mopars because of chronic 4-speed transmission problems. I make no excuses about being a big A833 fan, and in my opinion the 18-spline hemi 4-speed is the strongest of the three. The Toploader would be a reasonbly close second, and the Muncie would be the last.
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MUNCIE PARTS IDENTIFICATION. Muncie main drive gear and countergear parts are easily identified when the transmission is apart. The following table outlines the differences between the Muncie models. MUNCIE MODEL/YEAR. MAIN DRIVE GEAR (TEETH) MUNCIE MODEL/YEAR. COUNTERGEAR (TEETH) M20 1963-65. Wide Ratio.
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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.
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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 covers had a stud and the shift arm attached with a nut on the stud while the 1969 and later model side covers had a hole and the shift arms attached with a bolt.
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Muncie 4-Speed . The regular productions codes identify an M-20, M-21, and M-22. Of the regular production codes, one particular Muncie 4-speed type appears. A properly set up M-22 Rock Crusher transmits up to 700 hp, so this stout transmission is a wise choice for high-performance applications as well as authenticity.
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The M-22 gear teeth are cut at a noticeably lower angle (not quite at a straight angle as some people say). This lower angle of the teeth imparts greater strength to the gears, but it also increases the noise caused by the meshing of the gears. This higher level of noise is where the nickname "Rock crusher" originated.
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muncie. Both of the arms for 1/2 and 3/4 should be up... There is a hole in the shifter body to stick a pin in that aligns the shifter to neutral. Then fit each rod till it just slides into place... Go out run it up to 6500 rpm drop the clutch and yank um!!!!!! Just kidding about the last part, it's just how i test it out..... :thumbup: :thumbup:
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As for a cheap and easy trans for your truck, find a truck that has a 435 np four speed. Cheap and TUFF. Not the best shifting or ratios, but it will get you on the road for pennies and help you to be set up for when you might stumble upon a top loader four speed or a T-10,and will solve your shifter problems.
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This a BRAND NEW SUPERCASE M22 Muncie Rockcrusher Style Transmission. This is a BEEFY version of the original Rock Crusher transmission. Most all the weak points of an original Muncie have been solved by the Super-Case design. The Supercase has extra casting in all the known weak areas. The mid plate is aircraft grade aluminum.
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People think all Muncie four-speeds are Rock Crushers, but they're not. Nowadays there are custom gear ratios and set ups, including M21 wide-ratio and M22 wide-ratio units. You can pretty much get what you want. Beefed up boxes for hot rods and Resto-Mods are popular, too. " When rebuilding a Muncie four-speed you can take a '65 case and ...
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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.
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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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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 …
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For example P7C05 will read: Muncie four speed aluminum for passenger car 1976, March, 5th. 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.
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Complete automatic to muncie 4-speed conversion swap kits for GM cars available. Ultra Pro Super N24 Heavy Duty Muncie 4-Speed. Pro Street, Road Race and Gasser. Limited Production!!! SALE EXTENDED!!! $ 3,949.00 $ 3,649.00 Add to cart. Muncie Super Duty M23 Upgraded Ultra Case 4-speed Road or Drag Racing Rock-Crusher. SALE …
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Example: N7B27=Muncie,4 Speed built on February 27. On October 21, 1968, another letter code was added to the plant prefix number to identify Muncie transmission ratios. Muncie 3 Speed: A=3.03:1 B=2.42:1 Muncie 4 Speed: A=2.52:1 Wide Range B=2.2:1 Close Range C=2.2:1 Rock Crusher.
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The TKO600 might be rated at 600 ft. lbs. of torque, but it took the factory putting alittle over 1000 ft. lbs of torque to it to make it break. Along with the overdrive I feel that this makes the Tremec far superior to the Muncie.
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Price:$2,450.00. PART NUMBER:TRA-615. Description. 1967 - 1968 Muncie Four Speed Transmission M-22 RockcrusherComplete original GM Muncie transmission rebuilt and guaranteed for 1 year. Correct fit for all 1967 - 1968 model Chevelles and Novas. This one will have the studs coming out from the side where your shifter linkage mounts.
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I've installed them both.And In my opinion the M-22 is way better.The M-21 was close ratio but I've broken quite a few more of those,Than a M-22.The M-21 was good enough for a street driven cars,And racing.But the M-22 was far superior to it.I've only broke a M-22 twice.And I broke a M-21 more than 8 times. M22 is superior, but at the expense ...
DetailsThe M21 & M22 is a four speed, RWD or 4WD transmission. The M21 & M22 is a Muncie engineering design, this transmission is aluminum case, extension housing and side cover. The side cover has seven bolts and two shift cams. The synchro rings have 35 teeth and the unit has a 4 step cluster gear. The reverse gears are helical …
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This iconic transmission is based upon the infamous "ROCK CRUSHER" Transmission made famous in the 60`S AND 70`S by being installed in the L-88`S, BIG BLOCK 425 HP Factory Muscle Cars and HOT RODS of …
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Yes,avoid the penn syncromesh man trans oil,its like water/much thinner visc then 80-90 intended for a munice and it designed for todays man trans & not 40 yr old muncies. I also contacted pennzoil and they verified that fact and also stated it was never intended/designed for use in the older man trans like the muncie.
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People think the "Rock Crusher" is special or stronger than a standard wide box Muncie. It is special in terms of price but it isn't any stronger. The "Rock Crusher" was built for road racing, with the angle of the gears straightened out to prevent excessive wear in the front bearings due to the forward thrust component of the force vectors ...
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GN unit behind a muncie isnt going to make the muncie bulletproof, its just going to allow you for splitting gears. You may want to consider a new autogear muncie with the thicker case, iron midplate, etc. ... The transmission would make the same rock crusher noise, but I would have a much tougher transmission. 1966 Charger (383, 727 …
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The M22 was eventually dubbed the "Rock Crusher". It is a common misconception that all Muncie transmissions are "Rock Crushers", but it is only the M22 that deserves that name. The M20 and M21 were both release in 1963, but it wasn't until 1965 that the M22 hit the market. The M22 was created for the Corvette Grand Sport racing program.
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Muncie M20 Wide Ratio First Gear $ 126.00 – $ 150.00 Select options; Muncie M20 Wide Ratio Third Gear $ 118.00 Add to cart; Muncie M20/M21 Front Reverse Idler Gear $ 49.00 Add to cart; Muncie M22 Rock Crusher Input 10 Spline $ 178.00 – $ 185.00 Select options
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3500 x 3.08 / 4.10 = 2629 RPM. Using an M22Z with a 3.08:1 is like having an OD with a 4.10:1 AND you still have the takeoff feel of an M22 and a 4.10:1 combination. The M22Z and the 3.08:1 combination is not the answer for everyone but, it is another option. Jody Haag 610-413-8015. Jody's Transmissions on Facebook.
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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 !!!!!
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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 ...
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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 …
DetailsNew Auto Gear Upgraded Ultra Case Muncie HD M22 4-Speed Rock-Crusher, Camaro 4-speed 10/27 or 26/27spl. SALE EXTENDED!!! $ 3,499.00 $ 3,199.00. STRONGEST Direct Replacement M22 With NEW Muncie AUTO GEAR Upgraded Ultra CASE With The Strongest M22w WIDE RATIO or Close Ratio Gears for a 4 SPEED TRANSMISSION. A …
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Check These Out. Complete original GM Muncie transmission rebuilt and guaranteed for 1 year. Correct fit for all 1969 - 1973 model Chevelles and Novas. This one will have the holes on the side where a bolt will secure your shifter linkage levers. This is the Muncie M-22 Rockcrusher four speed.
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