Aug 3, 2018 · 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...

Sep 15, 2010 · 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 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.

Sep 23, 2018 · 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 M21 four-speed.

Sep 23, 2018 · 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.

Jan 25, 2022 · Many people know about Muncie transmissions and the famous M22 “rock crusher” transmission that has straighter cut gears that allows you to bang the gears without pushing in the clutch.

Nov 4, 2022 · How to Build a Bulletproof Muncie M22 Four-Speed Transmission. The Muncie M22 is known as the Rock Crusher. See how we improve its strength and versatility by adding a Gear Vendors Overdrive.

Jun 9, 2021 · 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 transmissions rattled their way down the road.

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. Another misconception is if you have a drain plug you have a M22.

The introduction of the transmission controlled spark (TCS) switch on the Muncie sidecover seemed to appear in 1970. This is an emissions device and its function is to disable the ignition system’s vacuum advance until the transmission is shifted into fourth gear.