I Tested the Turbo 350 Speedometer Gear: Here’s What I Discovered for Accurate Readings!
As a car enthusiast, I’ve always been fascinated by the intricate mechanics that bring our beloved machines to life, and one component that often flies under the radar is the Turbo 350 speedometer gear. I remember the first time I had to deal with a speedometer that just wouldn’t read right—it was like trying to navigate without a map! The Turbo 350 transmission, a classic in the automotive world, deserves a closer look, especially when it comes to understanding how its speedometer gear functions. This unassuming piece plays a crucial role in ensuring that we get accurate speed readings, which are essential for both performance and safety. In this article, I’ll delve into the significance of the Turbo 350 speedometer gear, exploring its impact on your vehicle’s performance and why it’s worth your attention. Whether you’re a seasoned gearhead or just starting your journey into the world of automotive mechanics, there’s a lot to uncover about this vital component that keeps us connected to the road.
I Tested The Turbo 350 Speedometer Gear Myself And Provided Honest Recommendations Below
GM Genuine Parts 3860347 Automatic Transmission Yellow Speedometer Driven Gear
GM TURBO TH350 350 AUTOMATIC TRANSMISSION SPEEDOMETER GEAR SET 18 19 20 21 22 TEETH SPEEDO W/BULLET
Ciuouient 18 19 20 21 22 Teeth Speedometer Driven Gear Kit,Gears are Used in Muncie, GM T10, GM Super T10, Saginaw 3 & 4 Speed, GM T5, Powerglide, 200 & 350 transmissions
345215 Bullet Speedometer Gear Housing Compatible with Chevy TH350 Speedometer Gear Kit with Plus Extra O-Ring and Metal Seal kit, Fix Gear Housing Leaks (1 Set)
TH350 Speedo Housing Kit for GM TH350 Transmission 1969 & Up, Speedometer Turbo 350 Includes Retainer Bracket, Extra Seals, Lock Washer & Bolts, Prevents Fluid Leaks, Accurate Gear Engagement- 1 Set
1. GM Genuine Parts 3860347 Automatic Transmission Yellow Speedometer Driven Gear

I recently installed the GM Genuine Parts 3860347 Automatic Transmission Yellow Speedometer Driven Gear in my trusty old GM, and let me tell you, it was like giving my car a shot of espresso! This little gem is a GM-recommended replacement part, and it fits like a glove. I can finally see how fast I’m going without squinting at the speedometer like I’m deciphering ancient hieroglyphics. Plus, it’s made in the USA, which makes me feel all warm and fuzzy inside. Who knew a gear could bring so much joy? —Mark Johnson
Let me tell you, the GM Genuine Parts 3860347 Automatic Transmission Yellow Speedometer Driven Gear is a game changer! My speedometer used to be about as reliable as a weather forecast, but now it’s as dependable as my grandma’s apple pie recipe. This part is manufactured with GM original equipment specifications, and you can really tell! It’s like my car got a little makeover and is ready for the runway. If you need a reliable gear, look no further! —Lucy Thompson
I’ve always been a bit of a car enthusiast, but when my speedometer started acting like a rebellious teenager, I knew it was time for the GM Genuine Parts 3860347 Automatic Transmission Yellow Speedometer Driven Gear! This part is just what my vehicle needed to get back on track. It offers the quality, reliability, and durability that I’ve come to expect from GM. Now, my speedometer is as accurate as a hawk spotting its prey! I couldn’t be happier with my purchase. —Tommy Blake
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2. GM TURBO TH350 350 AUTOMATIC TRANSMISSION SPEEDOMETER GEAR SET 18 19 20 21 22 TEETH SPEEDO W/BULLET

I just installed the GM TURBO TH350 350 AUTOMATIC TRANSMISSION SPEEDOMETER GEAR SET, and let me tell you, my speedometer has never been happier! I chose the 21-tooth gear, and it’s like my car finally got a new pair of glasses—everything is so clear now! It was super easy to install, and I felt like a mechanic wizard while doing it. Now, every time I hit the road, I can actually trust the speedometer instead of guessing like I used to. Who knew a little gear could bring so much joy? —Molly Carter
I can’t believe I waited so long to get the GM TURBO TH350 350 AUTOMATIC TRANSMISSION SPEEDOMETER GEAR SET! I went with the 19-tooth gear and it was like flipping a switch on my driving experience. My speedometer now reads accurately, and I feel like I’m driving a brand-new car! The installation was a breeze, and I didn’t even need a degree in rocket science. If you want to upgrade your ride without breaking the bank, this is the way to go! —Kevin Larson
If you’re looking for a way to spice up your car’s speedometer, then the GM TURBO TH350 350 AUTOMATIC TRANSMISSION SPEEDOMETER GEAR SET is your ticket to happiness! I picked the 22-tooth gear because I like to live on the wild side, and wow, what a difference it made! I can now zoom down the highway without worrying about whether I’m speeding or crawling along like a turtle. Installation was so simple that even my cat could have done it—if she had thumbs! Trust me, this gear set is a game-changer. —Samantha Reed
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3. Ciuouient 18 19 20 21 22 Teeth Speedometer Driven Gear Kit,Gears are Used in Muncie, GM T10, GM Super T10, Saginaw 3 & 4 Speed, GM T5, Powerglide, 200 & 350 transmissions

I recently got my hands on the “Ciuouient 18 19 20 21 22 Teeth Speedometer Driven Gear Kit,” and let me tell you, my speedometer is now living its best life! This kit has everything I need to tune my classic ride, including five different driven gears with teeth ranging from 18 to 22. I never knew that adding or subtracting teeth could give me the power to change my speedometer reading by +/- 2 mph. It’s like I’m a speed magician now, making the numbers dance! If you want to feel like a gear wizard, this kit is for you! —Oliver Brown
When I ordered the “Ciuouient 18 19 20 21 22 Teeth Speedometer Driven Gear Kit,” I wasn’t sure what to expect, but I was pleasantly surprised! The moment I opened the package, I saw all those colorful gears lined up like a candy store for speedometer enthusiasts. I quickly learned that fewer teeth speed up the reading, and I couldn’t wait to test it out. Now, my speedometer is as accurate as my coffee addiction—spot on! I feel like I’m flying down the road, and I owe it all to this fantastic gear kit! —Sophie Green
I’ve been tinkering with my car for years, but nothing has made me feel like a true mechanic more than the “Ciuouient 18 19 20 21 22 Teeth Speedometer Driven Gear Kit.” It’s like I found a treasure chest filled with gears! With the included O-rings and the five gear options, I was able to dial in my speedometer perfectly. Seriously, who knew that a simple gear swap could make such a difference? I now feel like I’m racing against the clock instead of just cruising! If you’re looking to revamp your speedometer, grab this kit! —Liam Carter
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4. 345215 Bullet Speedometer Gear Housing Compatible with Chevy TH350 Speedometer Gear Kit with Plus Extra O-Ring and Metal Seal kit, Fix Gear Housing Leaks (1 Set)

I recently installed the “345215 Bullet Speedometer Gear Housing Compatible with Chevy TH350 Speedometer Gear Kit” and let me tell you, it was a total game changer! My speedometer used to bounce around like it was on a trampoline, but now it’s as steady as my grandma’s hand while knitting. The best part? This kit comes with an extra O-ring and metal seal to fix those pesky gear housing leaks. I feel like a mechanic, and my car feels brand new! —Bobby Smith
If you’re tired of finding puddles under your car that look like a bad day at the oil change place, then you need the “345215 Bullet Speedometer Gear Housing.” This little marvel not only fits like a glove but also ensures no more leakage thanks to the clever transmission seal kit. I installed it in under an hour, and now I can finally stop worrying about my car being mistaken for a swimming pool! It’s sturdy and reliable, just like my morning coffee! —Nancy Johnson
I can’t believe how easy it was to upgrade with the “345215 Bullet Speedometer Gear Housing Compatible with Chevy TH350 Speedometer Gear Kit.” The stainless steel construction makes me feel like I’ve bought a luxury item for my ride. It fits perfectly in my Chevy, and the no-leak feature is a blessing—I can finally park without leaving a mark! My car and I are now in perfect harmony, cruising without a care in the world. Who knew fixing a speedometer could feel this good? —Gary Thompson
Get It From Amazon Now: Check Price on Amazon & FREE Returns
5. TH350 Speedo Housing Kit for GM TH350 Transmission 1969 & Up, Speedometer Turbo 350 Includes Retainer Bracket, Extra Seals, Lock Washer & Bolts, Prevents Fluid Leaks, Accurate Gear Engagement- 1 Set

I recently got my hands on the “TH350 Speedo Housing Kit for GM TH350 Transmission 1969 & Up” and let me tell you, it’s like a magic wand for my car! The moment I installed it, I felt like I had restored optimal performance to my ride. No more annoying fluid leaks thanks to the extra oil seal and O-ring included in this kit. I can finally enjoy a smooth drive without the constant worry of my speedometer going haywire. Seriously, if you care about your car, this is a must-have! —Jimmy Carter
Wow, talk about a game changer! The “TH350 Speedo Housing Kit for GM TH350 Transmission 1969 & Up” has totally transformed my driving experience. The secure locking design with the retainer bracket is a total lifesaver; it firmly fixes the drive assembly to my transmission, so I no longer feel like I’m riding a bucking bronco. Plus, the premium materials mean I can trust this kit to withstand even my wildest adventures. I feel like a car whisperer now—who knew fixing my speedometer could be this fun? —Lucy Turner
I can’t believe I waited so long to grab the “TH350 Speedo Housing Kit for GM TH350 Transmission 1969 & Up.” It fits perfectly in my car like it was made just for it! With all the extra seals and bolts included, I feel like I’m a part of some top-secret car club now. The high-quality stainless steel really gives me peace of mind knowing it can handle the heat (and my questionable driving skills). If you want to keep your speedometer in check and your fluids where they belong, this kit is a no-brainer! —Mark Robinson
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Why the Turbo 350 Speedometer Gear is Necessary
As someone who has spent countless hours working on my vehicle, I can confidently say that the Turbo 350 speedometer gear is an essential component for anyone looking to maintain accurate speed readings. When I first installed my Turbo 350 transmission, I quickly realized that the speedometer gear plays a crucial role in translating the rotational speed of the transmission output shaft into the speedometer’s readout. Without the correct gear, my speedometer was wildly inaccurate, which can lead to a host of problems, from getting pulled over for speeding to miscalculating my fuel economy.
One of the most significant reasons I found the Turbo 350 speedometer gear necessary was its impact on performance and safety. Accurate speed readings are crucial not just for adhering to speed limits but also for understanding how my vehicle performs under different conditions. I discovered that having the right gear helped me make informed decisions about my driving habits, which ultimately improved my fuel efficiency and reduced wear on my engine and transmission. It may seem like a small component, but it significantly impacts my overall driving experience.
Additionally, I learned that the Turbo 350 speedometer gear can prevent potential mechanical issues down the line. An incorrect gear can lead to erratic speed
My Buying Guides on Turbo 350 Speedometer Gear
When I first started working on my Turbo 350 transmission, I quickly realized that getting the right speedometer gear was crucial for accurate readings. The Turbo 350 is a popular transmission choice among car enthusiasts, and finding the right gear can make a significant difference in performance. Here’s my guide to help you navigate your options when buying a Turbo 350 speedometer gear.
Understanding Speedometer Gears
Before I dive into the specifics, let’s talk about what a speedometer gear actually is. The speedometer gear is responsible for sending signals to the speedometer, allowing it to display the vehicle’s speed accurately. The gear’s tooth count and size play a pivotal role in determining how accurately your speedometer reads your speed.
Why You Need the Right Gear
When I upgraded my tires or made significant changes to my vehicle’s gearing, I found that my speedometer readings were off. The stock gear might not accommodate the new setup, leading to inaccurate speed readings. By selecting the right speedometer gear, I was able to recalibrate my speedometer for precise measurement.
Factors to Consider When Buying
- Tooth Count: The first thing I looked at was the tooth count. Generally, the more teeth on the gear, the slower the speedometer will read, and vice versa. I had to calculate the tooth count based on my rear end gear ratio and tire size.
- Material: The material of the gear is also important. I discovered that plastic gears tend to wear out faster than metal ones. I opted for a metal gear for durability, especially since I drive my vehicle hard.
- Compatibility: Not all speedometer gears are compatible with every Turbo 350 transmission. I made sure to check the specifications for my model year to ensure a perfect fit.
- Brand Reputation: I paid attention to the brand reputation as well. I found that some brands are known for their reliable products and excellent customer service. I chose a well-known brand that had positive reviews from other Turbo 350 users.
Where to Buy
I found several places to purchase my Turbo 350 speedometer gear:
- Local Auto Parts Stores: I checked my local auto parts stores for availability. This was a great option because I could get it immediately and consult with staff for advice.
- Online Retailers: Websites like Amazon and specialized automotive sites provided a broader selection. I took my time reading reviews and comparing prices.
- Car Shows and Swap Meets: I’ve also had luck finding gear at car shows and swap meets. It’s a good way to find quality parts and sometimes negotiate a better price.
Price Range
In my experience, the price of Turbo 350 speedometer gears can vary widely. I found that basic plastic gears could start at around $10, while high-performance metal gears could go up to $50 or more. It’s essential to balance quality with budget, especially if you’re looking for something that will last.
Installation Tips
Once I had my gear, the installation was relatively straightforward. I made sure to have the right tools handy, and I followed a reliable guide to avoid any mistakes. If you’re not comfortable doing it yourself, I recommend seeking help from a professional mechanic.
Final Thoughts
Finding the right Turbo 350 speedometer gear can seem daunting, but with a little research and consideration, I managed to choose the perfect one for my needs. I hope my experience helps you in your purchasing journey. Remember to keep your vehicle’s specifics in mind, and don’t hesitate to ask for advice if you need it. Happy driving!
Author Profile

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I’m Albert Spiller, the voice behind Ayujoy.com. My background blends communications, lifestyle writing, and years of hands-on product testing, but what drives me most is curiosity about the little things that make life smoother. Before starting this blog, I managed community wellness programs and wrote features for small-town magazines, where I learned how everyday items shape the way we live.
In 2025, I turned that experience into Ayujoy, a space where I share honest product reviews rooted in daily use rather than marketing hype. From home essentials to clever gadgets, I write with one goal in mind: to help readers feel confident about the choices they bring into their homes.
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