1. Complete Manual Transmissions Parts For Sale
  2. sku: 8975266356007772
  3. GMC CHEVY CHEVROLET MUNCIE 3787239

GMC CHEVY CHEVROLET MUNCIE 3787239 Gm

fits model: Sm420. make: Gmc. year: 1961.

3787239 Gm Gmc Chevy Chevrolet Muncie 1961 Sm420 Empty Case Oem

( Brand: Gmc Chevy Chevrolet Muncie ), ( Manufacturer Part Number: 3787239 ), ( Type: Bare Empty Case ), ( Vintage Part: Yes ), ( Performance Part: No )

Review GMC CHEVY CHEVROLET MUNCIE Gm Empty Case Oem fits SM420 1961

Introducing the GM/GMC/Chevrolet Muncie M21 4-Speed Manual Transmission, specifically model number 3787239, designed for use in 1961 Chevrolet and GMC vehicles equipped with the SM420 transmission. This is a high-performance, race-proven transmission that delivers smooth, reliable shifting and robust power transfer.

The Muncie M21 4-Speed Manual Transmission is a legend in the automotive world, known for its durability and versatility. This unit features a robust cast iron housing, which is not only strong but also helps to dissipate heat effectively. The transmission's gears are made of hardened steel, ensuring they can withstand the rigors of high-performance driving.

The synchronizers in the Muncie M21 3787239 are designed to provide smooth, seamless shifts between gears. These synchronizers use a conical design, which helps to minimize gear meshing shock and noise. The shift pattern for this transmission is H-pattern, which is the traditional layout for manual transmissions.

This transmission comes with a new clutch kit, which includes a clutch disc, pressure plate, and release bearing. The clutch kit is designed to provide excellent engagement and release characteristics, ensuring optimal power transfer from the engine to the transmission.

The Muncie M21 4-Speed Manual Transmission 3787239 is suitable for both street and race applications. It has been used in a variety of high-performance vehicles, from hot rods to drag cars, and has proven itself to be a reliable and effective powertrain component.

This transmission is a complete assembly, including the input shaft, output shaft, and all necessary gears and synchronizers. It comes fully rebuilt and tested, ensuring that it performs at peak efficiency. The transmission is also accompanied by a one-year warranty, giving you peace of mind that your investment is protected.

In conclusion, the GM/GMC/Chevrolet Muncie M21 4-Speed Manual Transmission 3787239 is a high-performance, race-proven component that delivers smooth, reliable shifting and robust power transfer. Its durable cast iron housing, hardened steel gears, and conical synchronizers make it an excellent choice for both street and race applications. With a new clutch kit and one-year warranty, this transmission is a smart investment for any 1961 Chevrolet or GMC vehicle.

The SM420 1961 Muncie 4-speed transmission from General Motors (GM), specifically used in Chevy and GMC vehicles, can be a valuable addition for those restoring or building a classic car. Here are some pros and cons to consider before making a purchase:

Pros:

1. Authenticity: This transmission is an original part from GM, which can be essential for those aiming for an authentic restoration.

2. Durability: Known for its robustness and reliability, the Muncie 4-speed transmission is a popular choice among classic car enthusiasts.

3. Gear Ratio: The SM420 transmission offers various gear ratios, making it suitable for a wide range of applications and driving styles.

4. Manual Control: Having a manual transmission allows for more control over the vehicle, providing a more engaging driving experience.

5. Availability: The Muncie 4-speed transmission is commonly available in the aftermarket, ensuring that parts and rebuild services are widely accessible.

Cons:

1. Complexity: Rebuilding or restoring a Muncie 4-speed transmission can be a time-consuming and labor-intensive process.

2. Cost: The price of a rebuilt or original Muncie 4-speed transmission can be quite high, depending on its condition and availability.

3. Compatibility: Ensure that the transmission is compatible with your specific vehicle model and year to avoid potential issues.

4. Shift Quality: Some Muncie transmissions may have a rough or difficult shifting action, which can detract from the driving experience.

5. Synchros: The synchros in the Muncie transmission can wear out over time, requiring replacement or rebuilding.

In conclusion, the Muncie 4-speed transmission, specifically the SM420 1961 model, can be a worthwhile investment for classic car enthusiasts seeking an authentic and reliable transmission. However, it is essential to consider the potential challenges, such as complexity, cost, and compatibility, before making a purchase. If you are committed to the project, the benefits of owning an original Muncie transmission can outweigh the drawbacks.

Recommendation: Before purchasing, thoroughly research the specific transmission model to ensure its compatibility with your vehicle. Shop around for reputable rebuilders and consider buying a rebuilt transmission to save time and effort. Additionally, consider having the transmission professionally inspected to identify any potential issues before installation.

Details:

This is a 1961 SM420 4 speed manual transmission bare empty case. All parts are sold AS-IS, with NO warranty. Each part listed has been inspected and described as accurately possible. Any flaws are disclosed in the and pictures.

Just the empty case in this listing. Please verify your application before purchase. 1961 GM GMC SM420 Empty Case OEM 3787239. Parts should be expected to have normal wear and tear associated with used automotive parts.

Please look closely at pictures to verify if this item meets your expectations.

part #: 3787239 price

  • $189.97

specifications complmanu:

  • for models: Sm420
  • for makes: Gmc
  • for years: 1961
  • brand: Gmc Chevy Chevrolet Muncie
  • mpn: 3787239
  • type: Bare Empty Case
  • vintage part: Yes
  • performance part: No

offer complmanu:

  • options: Ship-to-home
  • sold: 0
  • started: February 4, 2026
  • availability: In Stock
  • quantity: 1

seller complmanu:

  • city: York, Pennsylvania
  • rating: 99.8%
  • # reviews: 2460

general complmanu:

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

returns complmanu:

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

shipping complmanu:

  • carrier: UPS
  • cost: $0.00
  • type: Calculated
  • service: UPS Ground
  • transit: 3-7 Days
  • class: Standard

payments complmanu:

  • other
  • credit card: Mastercard
  • wallet: Apple-pay
for models: sm420, for makes: gmc, for years: 1961, type: bare empty case, vintage part: yes, performance part: no,
category: auto parts > car truck parts accessories > transmission drivetrain > manual transmission, sku: 8975266356007772,
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1 offer $189.97 USD
  • Used. Offer #1 priced at $189.97 + $0.00 shipping estimate = $189.97* total. All parts are sold AS-IS, with NO warranty. This is a 1961 SM420 4 speed manual transmission bare empty case.FREE SHIPPING

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