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Description
xOverview
Keep your speedometer readings aligned with your actual speed using the Ciuouient Speedometer Driven Gear Kit. This precise set covers five driven gears of 18, 19, 20, 21, and 22 teeth, plus essential seals, so you can tailor the gear ratio to your transmission setup. Built for everyday driving and weekend maintenance alike, this kit provides a practical path to restoring reliable speed readings without guesswork.
What’s included
- Five driven gears with 18, 19, 20, 21, and 22 teeth, plus a corresponding O-ring.
- Bullet housing O-ring and inner seal for a tight seal and reliable installation.
Reliable performance
The kit’s components are molded from high-quality plastic reinforced with glass fiber, designed to withstand higher temperatures while remaining wear-resistant. This thoughtful construction helps support the drive cable’s performance under typical driving conditions, while offering durability for long-term use.
Replacement part numbers
Use this kit as a direct replacement for: 3987918 (18 teeth), 3987919 (19 teeth), 3987920 (20 teeth), 3987921 (21 teeth), and 3987922 (22 teeth).
How gear teeth affect readings
On the driven gear, fewer teeth read faster, more teeth read slower. For every tooth added or subtracted, expect about +/- 2 mph. The drive gear operates in the opposite direction: fewer teeth slow the reading, more teeth speed it up, with roughly +/- 10 mph per tooth.
Applicable scenarios
If your speedometer is no longer accurate due to wear or gear failure, this kit makes it possible to restore timely and accurate readings, allowing your speed indicator to reflect your current speed again.
Why choose Ciuouient
Designed for compatibility with common transmissions like Muncie, GM T10, Super T10, Saginaw 3/4 Speed, GM T5, and Powerglide, the kit offers a practical, non-intrusive update for DIY enthusiasts and professional technicians alike. With a focus on reliability and straightforward installation, it serves as a sensible upgrade option for drivers who value clarity on the dashboard and in-vehicle confidence.
Installation tips
- Verify the correct tooth count for your target calibration before installation.
- Ensure the O-rings and seals seat cleanly to prevent leaks and slippage.
FAQ
Q: Which transmissions are compatible with the Ciuouient Speedometer Driven Gear Kit?
A: Compatible with Muncie, GM T10, Super T10, Saginaw 3/4 speed, GM T5, Powerglide and related units.
Q: How do gear teeth affect the speedometer reading?
A: Driven gear teeth affect readings: fewer teeth read faster, more teeth read slower; each tooth changes the reading by a small, predictable amount.
Shipping & Return
xReturns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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