GM 590502 Nos Transmission Countershaft Gear 4-SPEED 3RD

( Brand: Gm ), ( Manufacturer Part Number: 590502 ), ( Type: Third Chevy Truck ), ( Oe/oem Part Number: 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1946 ), ( Country Of Origin: United States )

Review GM New Nos 4-speed Transmission Countershaft 3rd Gear Chevrolet fits 1931–1947

Introducing the GM 590502 NOS (New Old Stock) 4-speed transmission countershaft 3rd gear, specifically designed for Chevrolet vehicles manufactured between 1931 and 1947. This countershaft is an essential component of the transmission system, responsible for transferring power from the engine to the transmission gears.

This countershaft is meticulously crafted from high-quality steel, ensuring durability and reliability. It features a precisely machined third gear spline, ensuring a perfect fit and smooth engagement with the third gear dog clutch. The spline is designed to accommodate the specific tooth profile of Chevrolet's third gear, ensuring optimal gear engagement and transmission performance.

The countershaft is also equipped with two bearing surfaces, which are designed to minimize friction and wear, resulting in a longer service life and improved transmission performance. These bearing surfaces are precision-machined to ensure a snug fit within the transmission housing and a secure connection to the shaft.

The GM 590502 NOS 4-speed transmission countershaft 3rd gear is an authentic, original replacement part. It comes in its original packaging, ensuring that it has been stored properly and protected from the elements. This packaging is made of high-quality materials, designed to preserve the part's condition and prevent any potential damage during shipping.

Installing this countershaft is a straightforward process, requiring only basic hand tools and a few hours of your time. It is compatible with all Chevrolet vehicles manufactured between 1931 and 1947 that use a 4-speed transmission.

In summary, the GM 590502 NOS 4-speed transmission countershaft 3rd gear is an essential replacement part for Chevrolet vehicles manufactured between 1931 and 1947. It is meticulously crafted from high-quality steel, features precision-machined gear splines, and has two bearing surfaces to minimize friction and wear. It comes in its original packaging and is compatible with all Chevrolet vehicles using a 4-speed transmission during this time period.

1. Availability: This part is easily available in the aftermarket, which makes it relatively easy to find and purchase.

2. Cost-Effective: Compared to rebuilding or replacing the entire transmission, purchasing just the countershaft third gear can save a significant amount of money.

3. Authenticity: A factory-original part like this can add value to a classic car restoration project and increase the overall authenticity of the vehicle.

1. Cost: While this option may save money compared to a full transmission replacement, the cost of purchasing a new countershaft third gear may still be higher than reusing the existing one or finding a used one in good condition.

2. Complexity: Installing a new countershaft third gear requires a high level of mechanical skill and knowledge, which may be beyond the abilities of some hobbyists or home mechanics.

3. Potential for OEM Quality Variations: While a factory-original part is desirable, it's important to note that GM parts produced during different periods may have slight variations in quality, which could impact the performance and longevity of the transmission.

The decision to buy a GM 590502 NOs 4-speed transmission countershaft 3rd gear for a 1931-1947 Chevrolet depends on several factors, including the condition of the existing part, the availability of used alternatives, and the skill level of the person performing the installation. While this option offers the advantage of authenticity and availability, it may not be the most cost-effective solution for all situations. If the existing countershaft third gear is in good condition and can be reused, it may be worth considering that option instead. However, if the part is worn out or unavailable as a used alternative, purchasing a new one may be the best choice for those with the necessary skills and resources. Ultimately, a thorough assessment of the vehicle and the available alternatives is recommended before making a decision.

1. Evaluate the condition of the existing part.

2. Assess the availability and cost of used alternatives.

3. Determine if the installation can be performed by the person with the necessary skills and resources.

4. Consider the potential impact on the overall performance and longevity of the transmission.

5. Weigh the advantages and disadvantages of purchasing a new part versus reusing the existing one or finding a used alternative.

6. Consult with professionals or experienced hobbyists for advice and guidance.

Details:

See pics for condition. Has some light surface rust from sitting. Part is dusty/dirty and shows some patina from handling sitting on the shelf. New NOS GM gear, part number 590502.

Please verify part number and pics match your application.

part #: 590502 prices

• $59.99-$395.00

specifications manutransmission:

• for makes: Chevrolet
• for years: 1931-1947
• brand: Gm
• mpn: 590502
• type: Third Chevy Truck
• oe/oem part number: 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1946
• country of origin: United States

returns manutransmission:

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

payments manutransmission:

• credit card: Discover
• wallet: Paypal
• other

offer manutransmission:

• availability: In Stock
• options: Ship-to-home
• sold: 0
• started: March 11, 2026
• best offers: True
• quantity: 1

general manutransmission:

• Car Truck Parts Accessories > Transmission Drivetrain > Manual Transmission Parts
• condition: New other see details

seller manutransmission:

• city: Sheboygan Falls, Wisconsin
• # reviews: 33625
• rating: 100.0%

shipping manutransmission:

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

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