How to Build a Bulletproof Muncie M22 Four …

In contrast, close-ratio transmissions (which use a 2.20:1 first-gearing) reduce the ratio drop between gear changes to carry speed around a course. Related: Guide to Muncie M20, M21, and M22 Four ...

Muncie Identification | The H.A.M.B.

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 …

M-22 "rock crusher"

hopefully he meant that a m22/rock crusher was rarer installed in a car. jim. Jim. 70 chevelle, SS clone 454 4 speed 3.31 12 bolt posi. 71 camaro. (owned since 1978!) 454-th400 3.07 12 bolt. 66 chevelle 350 4 speed 3.55 12 bolt and a newly added 142 wieand blower. Share.

Muncie 4-Speed Identification Guide

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 … See more

How to Identify a Muncie Four Speed

Several things are needed to identify a Muncie four-speed transmission correctly. One of the best ways to identify a Muncie is the casting numbers on the external components of the transmission ...

How To Identify Chevy Four-Speed Transmissions

The M20 and M21 used a gearset with a more angled tooth design on each gear (left). The M22 Rock Crusher used a gearset that features less of an angled-tooth gearing (right). Images courtesy chevelles. The gear ratio of the Chevy four-speed transmission placed in any car was usually determined by the engine size and rearend …

The 1965 Chevrolet M22 Rockcrusher Transmission: The …

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 …

The Muncie 4 Speed Transmission Taught A …

The M22 'Rock Crusher' featured a one-inch countershaft pin bore and shot-peened gears with aggressive helix angles that reduced heat and stress but also increased noise, leading to the nickname as the …

New Auto Gear Upgraded Ultra Case Muncie HD M22 4-Speed Rock-Crusher

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 …

Guide to Muncie M20, M21, and M22 Four-Speed …

The M22 Rock Crusher 26-spline input shaft sports a wider gear for greater torque capacity. Just because you've found a 26-spline input shaft does not mean you've found an M22 input shaft, which is …

Muncie 4-speed Transmissions

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 …

M22 Rock Crusher

Call and check our inventory of rebuilt OEM GM M22 4 Speeds. We use original M22 Cases and M22 Gear Sets or rebuild them with our aftermarket M22 Gears when the original gears are too worn to be re-installed.

Muncie 4 speed....M21, M22, Rock Crusher? | The H.A.M.B.

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 weird,1-2-4-3.

Muncie Identification | The H.A.M.B.

The M20 is a wide ratio and was the standard GM 4 speed of the time. M21 (close ratio) and M22(close ratio heavy duty) were options M21 and M22 have the same ratios but the M22 has straighter cut gears to help prevent end loading thats the only difference between the M22 and M21. the 2.20 first gear is not ideal for street driving …

How to Identify a Muncie Four Speed: Build Date Codes

1. The main case date code is usually found on the passenger side of the case just below the casting number. 2. The extension housing date code can usually be found on the passenger-side of the ...

M22 Identification | Team Chevelle

The FACTORY M-22s were ONLY a close ratio version (2.20:1 first gear). The aftermarket M-22s are available as either a close ratio or wide ratio (referred to as …

M22 Identification | Team Chevelle

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 ! ... ID - 136370R Vin - 136370R235102 . ... (2.20:1 first gear). The aftermarket M-22s are available as either a close ratio or wide ratio (referred to as an M-22W with a 2.56:1 first gear).

How to Identify a M22 Rock Crusher | It Still Runs

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 …

Rock Crusher identity | Hot Rod Forum

The only way to tell an M22 is by looking at the gear set. You cannot go by the old method of "it has a drain plug so it's an M22". Also the input shaft cannot be used as a guide because there are various …

Muncie 4-speed

Easily identified by the reverse gear being on the main case instead of the tail housing. The proper Hurst Competition Plus system for a 1966-1967 Saginaw is shifter #3917307 and installation kit #3734297.

Muncie 4-Speed: The Complete History

Today's VINs (vehicle identification numbers) are even bar coded. A service technician can use a scanner to find a VIN, and any known service issues are easily found. ... The reduction in the angle with the M22 is quite substantial. The M22 first gear has an angle of 14.5 degrees and the input shaft is 24.2 degrees.

Muncie 4-speed

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 less end loading of the gear train and less heat but created more noise, thus the nickname "Rock Crusher" was born.

M22-Wide vs M22 "Rock Crusher"

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.

Muncie 4 Speed Transmissions

Top countergear is an M22. Lower gear is an M20. Notice the different helix angles of the gears. Below left is an M22 1st gear. Right is an M20 / M21 1st gear. How to Identify Muncie 4 Speed Transmissions.

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