Manual Transmissions. As mentioned above, modern 5-speed and 6-speed manual transmissions are easy to identify, but older 4-speed transmissions have more variety. While there are no distinctive pans and bolt counts to make transmission identification simple, 4-speed manual transmissions can be generally identified by examining the side profile. Manual Powerglide: A: Saginaw: overdrive: O: Cleveland: Turbo Hydramatic: B: Warner Gear: 3 4 speed: P: Cleveland: Powerglide: C: Muncie: 4 speed: P: Hydramatic: Turbo Hydramatic: CA: Muncie: 4 speed: R: Saginaw: Overdrive: D: Saginaw: 4 speed: R: McKinnon: Powerglide: E: Muncie: 3 speed: S: Muncie: 3 speed: H: Saginaw: 3 speed: S: . Information is provided for General Motors 3 speed, 4 speed, 5 speed and 6 speeds manual transmissions. Cast iron case and extension housing with 4-bolt side cover. Has non-synchro 1st and a "barrel" type 2/3 assembly. Units from have enclosed driveline, otherwise known as a "torque tube". Those from may have electric overdrive.
Manual Transmissions. As mentioned above, modern 5-speed and 6-speed manual transmissions are easy to identify, but older 4-speed transmissions have more variety. While there are no distinctive pans and bolt counts to make transmission identification simple, 4-speed manual transmissions can be generally identified by examining the side profile. Note 3: M/22 gear ratio: 1st , 2nd , 3rd , 4th direct, Rev Effective Octo, an additional letter was added to the plant prefix number to help identify the gear ratios in Muncie transmissions. The additional letter codes as follows: Muncie 3 speed Manual. Muncie 4 speed manual transmissions. GM Transmission RPO Codes. RPO Codes are a system that GM uses to identify which parts and options are on any particular vehicle that they manufacture. RPO codes are typically placed in the glove compartment, which allows you to view the options on your vehicle without ever cracking the hood, or crawling under the car.
How to identify and decode chevrolet manual transmissions. of id's, stampings, numbers, etc varied and even GM couldn't keep track of what was what. Manual transmissions designed for gasoline engines will have poor drivability if used with a diesel engine, GM models may be identified as RPO code MY6. Jun 1 Preamble; 2 Casting numbers. Date codes. 3 GM transmissions, including Muncie M20, M21, M22; 4 Automatic transmissions.
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