— 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.

The difference between a Muncie and a Borg-Warner is the Muncie's 7-bolt side cover (two less than Borg-Warner units). Many Muncie main cases, tail housings and side covers have casting date codes. The code consists of two ½-in. circles divided in half. ... People think all Muncie four-speeds are Rock Crushers, but they're not.

 — that 572 is going to crack that muncie like an egg. i hear stock muncie rock crushers are rated at 375 foot lbs...which is like a nice 350 without aluminum heads. big torque requires an expensive clutch and standard transmission. a turbo 400 is a safer bet...all i know is that torque breaks stuff and torquey shock loads break stuff quicker.

Diagram shows the parts and basic workings of a GM Muncie 4-speed. This worn out Muncie synchro hub is of a type used from 1966-1974. The 27-spline tail shaft housing. Some Muncie parts are very valuable to …

 — 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 22.5 degrees. They used this to reduce friction and in turn gave it a nice greary noise thus the rock crusher. Chris

 — The 1964-65 Muncie transmission main case casting number was #3851325. It was designed for the use of the 7/8″ countergear pin inside the transmission assembly. To manufacture the M22, the …

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The easiest way to identify a Muncie transmission is by its side cover. Muncies have seven bolts, two bolts on the bottom, three on the top and one down each side. There are also …

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 — These are typically found in 70's GM cars and trucks. This Bellhousing has the correct transmission bolt pattern except for one upper bell housing bolt hole to adapt a 4-speed to an LS-series engine. Classic Industries offers an adapter Bellhousing that is basically a 621 housing with all bolt holes that are required when using an LS series ...

 — Having issues diagnosing problems with your M21 M22 4 Speed Muncie Manual Transmission? we can help. ... Rebuilt Transmission M22 1966-1974 Rock Crusher MTGM038. ... (Bolt Type) TRS18-598-005 Cover (Center Support) (Iron) TRS18 ...

 — 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 close ...

 — The Muncie is either a 2.20 or a 2.54 low ( 1st gear ) The Muncie seems to shift a little slicker but the I would go with a Ford Top Loader. Many years ago when I ran a BBC drag car ... I broke a few Muncies. Then I adapted a Ford Top Loader and stopped the breakage ... I also like the lower first gear. Down side is that the Ford Top Loader is ...

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 — 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.

The shifter bolt pattern does not allow early linkage mounting plates to bolt to it. You have to shorten the driveshaft; of course, you also have to change the clutch disc and driveshaft …

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.

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 …

 — 70 chevelle, SS clone 454 4 speed 3.31 12 bolt posi 71 camaro. (owned since 1978!) 454-th400 3.07 12 bolt ... come guys, every gearhead knows every muncie is a rock crusher, every 327 came out of a corvette and all 12 bolts are posi's! I didn't even read this on the internet, 70% of the guys at the gas station tells me this when I'm gassing up ...

Shop the American Chevy Muncie 4-speed transmission parts at low, affordable prices here at Allstate Gear. View more. ... GM Speedo Housing Retaining Bracket & Bolt Kit Our Price: $11.90 (7) Input Bearing Output Bearing Max load, M6308N ... Both the wide-ratio M20 and close-ratio M21 debuted in 1963 in the Corvette. The M22 "Rock Crusher ...

 — 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 identification codes, I found a perfect match. ... The 1964-65 Muncie transmission main case casting number was #3851325.

The Chevy transmission features a bolt pattern with a triangular-shaped top (right), while the B-O-P version features a concave-shaped (left). ... A Muncie 4-speed works best when the synchro assemblies are precisely assembled and work in harmony with the gear cone and slider. The disassembly and assembly of the M-20 is similar to that of the M ...

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 M does not stand for "Muncie.") Typically, when you ordered a …

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 strong-er helical gears in the M22.

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.

Serial numbers for Muncie 4 speeds always begin with the letter "P". P stands for Muncie Plant. ... 335308 Long boss bolt on type with neutral safety switch. Some have a boss for the switch that is cast but not machined on 1-2. Casting: 3831704 Years: 1963 Only Ratios: M20 2.56 1st, M21 2.20 1st ... thus the nickname "rock crusher". The higher ...

 — ""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.. Kinda nice if you want the Muncie look and an overdrive"" 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.

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 …

 — The 2.20:1 ratio first gear is usually referred to as the Muncie M21 transmission; based on GM's production codes. The 2.56:1 ratio is referred to as the M20. 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. …

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