GM MUNCIE 297-21 Transmission Gear M21 2ND

( Brand: Gm Muncie ), ( Manufacturer Part Number: 297-21 ), ( Part Type: Transmission Gear )

Review GM MUNCIE M21 Speed Transmission 30 Tooth 2nd Gear 30t Original fits M20

The GM Muncie M20 and M21 transmission, specifically the 30-second gear 30T variant, is a iconic manual transmission that was produced by General Motors between 1963 and 1974. This transmission was a popular choice for various applications, including muscle cars and trucks, during the muscle car era.

The Muncie M20 and M21 transmissions are both 3-speed synchronous manual transmissions that feature a cast iron case and a robust design. The main difference between the two is that the M21 transmission includes a Synchro-Mesh design in all forward gears, making shifting smoother and easier. This feature was an upgrade from the earlier M20 transmissions that required double clutching when shifting from first to second gear.

The 30T designation refers to the 3.00:1 ratio of the second gear, which provides ample power and torque for high-performance applications. The 30-second gear is a popular choice for enthusiasts who desire improved acceleration and power delivery in their vehicles.

The Muncie M20 and M21 transmissions are known for their durability, strength, and ability to handle high horsepower and torque. They are also relatively lightweight compared to other transmissions of the same era, making them a popular choice for hot rods and restorations.

The synchromesh design of the M21 transmission makes it easier to shift gears, especially in high-performance applications where quick shifts are essential. The first gear is a direct drive, which provides maximum power and torque at the cost of a lot of engine RPM. Second gear, with its 3.00:1 ratio, provides a good balance of power and engine speed, making it suitable for both city driving and highway cruising. Third gear, with its 1.58:1 ratio, is a tall overdrive gear that helps to reduce engine RPM at highway speeds, improving fuel economy and reducing engine wear.

The Muncie M20 and M21 transmissions are a popular choice among enthusiasts due to their proven reliability, durability, and ability to handle high horsepower and torque. They have a classic look and feel that is highly sought after by collectors and restorers, making them a valuable addition to any muscle car or hot rod project.

If you're looking for a transmission that can provide reliable power delivery, smooth shifting, and a classic look, then the GM Muncie M20 or M21 transmission with a 30T 3.00:1 second gear is an excellent choice. Whether you're building a hot rod, restoring a classic muscle car, or just looking for a high-performance transmission for your project, the Muncie M20 or M21 transmission is a proven performer that is sure to meet your needs.

The GM Muncie M20 and M21 4-speed manual transmissions, specifically the 297-21 with a 30-spline input shaft and 21-tooth 3rd gear, are popular choices among classic car enthusiasts and hot rod builders due to their durability and performance capabilities. However, like any automotive component, they come with their own set of pros and cons.

1. Durability: The Muncie M20 and M21 transmissions are known for their robustness and reliability. They were used in various GM vehicles from the 1960s to the 1980s and have a reputation for handling high power levels and heavy use.

2. Wide Application: These transmissions have been used in a variety of GM cars and trucks, making them a versatile choice for restorations and custom builds. They can be found in popular models such as the Chevy Camaro, Chevy Nova, and Chevy Corvette.

3. Affordability: Compared to some other high-performance manual transmissions, the Muncie M20 and M21 are relatively affordable, making them an attractive option for those on a budget.

4. Performance: With a 30-spline input shaft and a 3rd gear ratio of 30:1, these transmissions provide excellent power transfer and acceleration, making them a popular choice for performance builds.

1. Complexity: The Muncie M20 and M21 transmissions have a complex syncromesh system, which can make rebuilding and maintenance more challenging than some other transmissions. Additionally, the close-ratio gears can make shifting more difficult, especially for those not accustomed to manual transmissions.

2. Availability of Parts: While the Muncie M20 and M21 transmissions are relatively common, finding specific parts for them can be difficult, especially for rare applications or hard-to-find components. This can make repairs and rebuilds more costly.

3. Compatibility: These transmissions were designed for rear-wheel-drive applications and may not be directly compatible with front-wheel-drive vehicles or modern fuel injection systems. Adapters and modifications may be required, adding to the cost and complexity of the project.

In conclusion, the GM Muncie M20 and M21 4-speed manual transmissions, specifically the 297-21 with a 30-spline input shaft and 30:1 3rd gear, offer excellent durability, performance, and versatility. However, they come with the challenges of complexity, availability of parts, and compatibility issues. Ultimately, the decision to buy one of these transmissions depends on the individual's budget, experience level, and specific application requirements. If you're comfortable with the challenges and appreciate the performance benefits, a used Muncie M20 or M21 transmission could be a worthwhile investment for your project car.

Details:

It is designed to fit specific model's and brands, including GM MUNCIE, suitable for use in car truck transmission drive train systems. This Muncie M20 M21 4 speed transmission 30 tooth 2nd gear is an original GM part with the manufacturer number WT 297-21 / 304582.

part #: 29721 prices

• $76.88-$132.12

specifications manutransmission:

• for models: M20
• brand: Gm Muncie
• mpn: 297-21
• part type: Transmission Gear

shipping manutransmission:

• carrier: USPS
• type: Calculated
• cost: $13.20
• transit: 3-7 Days
• class: Standard
• service: USPS Ground Advantage

returns manutransmission:

• time: 30 Days
• paid by: Buyer
• policy: Returns Accepted

general manutransmission:

• Car Truck Parts Accessories > Transmission Drivetrain > Manual Transmission Parts
• condition: Used

payments manutransmission:

• credit card: Mastercard
• other
• wallet: Google-pay

offer manutransmission:

• availability: In Stock
• options: Ship-to-home
• started: March 6, 2025
• quantity: 1
• sold: 0

seller manutransmission:

• rating: 99.9%
• # reviews: 7438
• city: Cincinnati, Ohio

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