GM 8640708 Automatic Transmission Shaft THM250C M31

( Brand: Gm ), ( Manufacturer Part Number: 8640708 ), ( Part Type: Transmission Shaft )

Review GM New Oem Automatic Transmission Output Shaft M31 fits 1980–1981

The GM 8640708 automatic transmission shaft is a crucial component for vehicles equipped with the THM250C M31 transmission, specifically those manufactured between the years 1980 and 1981. This shaft plays a vital role in the smooth operation of the automatic transmission system by transmitting power from the engine to the transmission.

The GM 8640708 transmission shaft is made of high-strength steel, ensuring durability and reliability even under heavy load conditions. Its cross-sectional design is compact yet robust, allowing it to efficiently transfer power while minimizing friction and wear. The shaft's splined ends are precision-machined to ensure a secure fit with the transmission and engine components, reducing the risk of slippage or leaks.

The shaft features a hollow design, which not only helps to reduce weight but also allows for the passage of various transmission fluids, such as coolant and hydraulic fluid. This design is essential for maintaining optimal transmission performance and temperature regulation.

Additionally, the GM 8640708 automatic transmission shaft comes with seals and gaskets, which are essential for preventing leaks and maintaining transmission fluid levels. These seals and gaskets are made of high-quality materials that are resistant to wear and tear, ensuring a long-lasting and leak-free transmission system.

When it comes to installation, the GM 8640708 transmission shaft is designed to be a direct replacement for the original equipment manufacture (OEM) part. This means that no modifications are required, making the installation process straightforward and efficient. However, it's always recommended to consult the vehicle's service manual or a professional mechanic to ensure a proper and safe installation.

Overall, the GM 8640708 automatic transmission shaft is an essential component for maintaining the smooth and reliable operation of the THM250C M31 transmission in vehicles manufactured between 1980 and 1981. Its high-strength steel construction, compact design, and precision-machined splines ensure a secure and efficient power transfer while minimizing friction and wear. With included seals and gaskets, this shaft is a direct replacement that is easy to install and offers long-lasting performance.

Buying a GM 8640708 automatic transmission shaft for 1980-1981 Thm250c M31 can be a crucial decision for those who own vintage cars or are working on a restoration project. Here are some potential pros and cons to consider before making a purchase.

1. Availability: Replacing a worn-out or damaged transmission shaft can be essential to keep your classic car running smoothly. By purchasing a new GM 8640708 transmission shaft, you can ensure a reliable and functional transmission system.

2. Quality: A new transmission shaft will be free of wear and tear, providing superior performance and longevity compared to a used or rebuilt part. Additionally, purchasing from a reputable supplier can guarantee the quality of the product.

3. Peace of mind: Knowing that a critical component of your transmission system is in good working order can provide peace of mind and allow you to enjoy your vintage car without worrying about unexpected breakdowns.

1. Cost: A new GM 8640708 transmission shaft can be relatively expensive, especially for those on a tight budget. The cost may be a significant factor to consider before making a purchase.

2. Installation: Installing a new transmission shaft can be a complex and time-consuming process, requiring specialized tools and technical expertise. Additionally, some transmission systems may require additional repairs or adjustments to ensure proper functionality after the shaft replacement.

3. Availability of replacement parts: If you are restoring an older model car, it may be challenging to find replacement parts, including transmission shafts, in good condition. In such cases, a new GM 8640708 transmission shaft may be the best option, but it comes with a higher cost.

Considering the pros and cons, purchasing a new GM 8640708 transmission shaft for your 1980-1981 Thm250c M31 can be a worthwhile investment if you value reliability, performance, and peace of mind. However, the significant cost and installation complexity are essential factors to weigh against the benefits. Ultimately, the decision to buy a new transmission shaft depends on your budget, technical expertise, and priorities for your vintage car project. If you have the resources and are committed to restoring your classic car to its original condition, a new transmission shaft can be a wise investment. If you're on a tight budget, exploring other options, such as used or rebuilt parts, may be worth considering.

Details:

If any manufacturer warranty exists, it is between you and them. Or any other minor issue that does not make the part you are buying DEFECTIVE. Be sure the part you are buying is correct for your application. ONCE Purchased YOU OWN IT.

Gear Shaft Output GR 4.175. None of which makes the part Defective. GM part number 8640708. There may be minor corrosion, scuffs, torn or missing boxes, scratches from storage, etc.

Sometimes the fitment is so old that it does not take into account trim, engine size or build dates. Rubber parts, gaskets, hardware may need to be replaced and not usable. Shipping:: Free Shipping is for continental USA only. They may have been in storage anywhere from 1-30 years.

part #: 8640708 prices

• $13.76-$35.99

specifications othellodrivetrain:

• for years: 1980-1981
• brand: Gm
• mpn: 8640708
• part type: Transmission Shaft

seller othellodrivetrain:

• rating: 99.3%
• # reviews: 240405
• city: Houston, Texas

general othellodrivetrain:

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

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returns othellodrivetrain:

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

shipping othellodrivetrain:

• type: Fixed
• cost: $0.00
• carrier: USPS
• class: Standard
• service: USPS Ground Advantage
• transit: 4-7 Days

offer othellodrivetrain:

• quantity: 9
• sold: 0
• availability: In Stock
• options: Ship-to-home
• started: August 14, 2025

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