GM 8640519 Turbo Automatic Transmission Speedometer Gear Kit TH400 THM400 15/40

( Brand: Gm ), ( Manufacturer Part Number: 8640519 ), ( Part Type: Kit ), ( Item Package Quantity: 15 ), ( Material: Metal-plastic-rubber )

Review GM Aftermarket Turbo 400 Automatic Transmission Speedometer Gear Kit 15/40

Precision-Engineered TH400/THM400 Automatic Transmission Speedometer Gear Kit (15/40)

Experience seamless driving with our 8640519 GM Turbo 400 TH400 THM400 Automatic Transmission Speedometer Gear Kit (15/40). This high-quality kit is meticulously designed to ensure optimal performance and durability for your vehicle's transmission system.

Crafted with precision, this speedometer gear kit is specifically engineered to fit TH400 and THM400 automatic transmissions. The 15/40 designation refers to the ratio of the speedometer gear to the output shaft gear. This ratio is crucial for accurate speedometer readings, guaranteeing you always have a precise sense of your vehicle's speed.

Made from top-tier materials, this speedometer gear kit promises unparalleled durability and reliability. The gears are hardened and precision-machined to ensure smooth operation, even under heavy loads. The kit also includes all necessary hardware for easy installation, making it a hassle-free upgrade for your transmission system.

Installation is straightforward, requiring only basic hand tools and a modest level of mechanical skill. The kit comes with detailed instructions to guide you through the process, ensuring a hassle-free installation that won't take up too much of your time.

With this TH400/THM400 Automatic Transmission Speedometer Gear Kit (15/40), you can restore the accuracy of your speedometer, improve the performance of your transmission, and enjoy a smoother, more enjoyable driving experience. Whether you're a professional mechanic or a DIY enthusiast, this kit is a worthwhile investment for your vehicle. Upgrade your transmission today and experience the difference!

Pros, Cons, and Recommendation for the 8640519 GM Turbo 400/TH400/THM400 Automatic Transmission Speedometer Gear Kit (15/40)

1. Compatibility: This kit is designed to fit a wide range of GM vehicles equipped with Turbo 400, TH400, or THM400 automatic transmissions, making it a versatile option for many classic car owners.

2. Precision: The speedometer gear in this kit is precision-made to ensure accurate speed readings, which is crucial for safe and efficient driving.

3. Durability: The components are designed to withstand the rigors of high-performance driving, providing long-lasting reliability.

4. Easy Installation: The kit comes with detailed instructions, making it relatively easy for DIY enthusiasts to install, saving on labor costs.

1. Limited Speed Range: This kit is specifically designed for speedometer readings up to 15/40. If your vehicle requires a different speed range, you may need to purchase a different kit.

2. Potential Fitment Issues: While the kit is designed to fit a wide range of GM vehicles, there may be instances where the gear does not fit perfectly, requiring some modification.

3. Quality Concerns: Some customers have reported receiving parts that do not meet the expected quality, although this seems to be relatively rare.

4. Limited Speedometer Coverage: The kit does not include a speedometer cable or a speedometer itself, so you will need to ensure that your existing speedometer is compatible or purchase a new one.

The 8640519 GM Turbo 400/TH400/THM400 Automatic Transmission Speedometer Gear Kit (15/40) offers a cost-effective solution for replacing worn-out speedometer gears in a wide range of GM vehicles. However, potential fitment issues, quality concerns, and the need for additional components should be considered before making a purchase. If you are comfortable with potential modifications and have the necessary tools, this kit could be a good choice. Otherwise, it may be worth considering a more expensive option from a known brand for peace of mind.

If you are comfortable with potential modifications and have the necessary tools, the 8640519 GM Turbo 400/TH400/THM400 Automatic Transmission Speedometer Gear Kit (15/40) could be a good budget-friendly choice. However, if you prefer a more reliable solution with fewer potential issues, you may want to consider a more expensive option from a known brand like TCI or Summit Racing Equipment. Always ensure that the kit is compatible with your specific vehicle model before making a purchase.

Details:

For every tooth added or subtracted is - 2mph. For every tooth added or subtracted is - 10mph. Drive gear: Fewer teeth will slow down the speedometer reading and more speed up. GM TURBO TH400 TRANSMISSION SPEEDOMETER GEAR RECALIBRATION KIT DRIVEN GEARS, Included in Kit: Speedometer Gear housing w/Inner Outer Seals Y-Bracket w/Standard Metric Bolts, GEARS: DRIVE 40 Black 15 Grey, 41 Yellow, 42 Green, 43 Blue, 44 45 Olive, Gears Meet or Exceed OEM Quality have a higher percentage of fiberglass giving them temp rating and increasing tinsel strength for the drive cable.

Quality is Every Thing. Being a Builder / Engineer. Colors may very, Helpful Tips: Driven gear: Fewer teeth will speed up the speedometer reading more slow down.

part #: 8640519 prices

• $11.85-$292.99

specifications tvmountbracketgo:

• brand: Gm
• mpn: 8640519
• part type: Kit
• item package quantity: 15
• material: Metal-plastic-rubber

general tvmountbracketgo:

• TV, Video Audio Accessories > TV Video Accessories > TV Stands Mounts
• condition: New

seller tvmountbracketgo:

• rating: 100.0%
• # reviews: 636
• city: Brentwood, New York

shipping tvmountbracketgo:

• carrier: USPS
• class: Economy
• type: Fixed
• cost: $0.00
• transit: 5-11 Days
• service: USPS Media Mail

returns tvmountbracketgo:

• paid by: Seller
• time: 30 Days
• method: Money back
• policy: Returns Accepted

payments tvmountbracketgo:

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• wallet: Apple-pay

offer tvmountbracketgo:

• started: September 30, 2025
• options: Ship-to-home
• availability: In Stock
• quantity: 1
• sold: 0

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