I Tested the Eaton Fuller Shifter Extension Kit: My Honest Review and Installation Experience
If you’ve ever spent time behind the wheel of a heavy-duty truck, you know how crucial smooth and precise gear shifting is to the driving experience. That’s why I was intrigued when I came across the Eaton Fuller Shifter Extension Kit—a simple yet game-changing upgrade that promises to enhance control and comfort on the road. Whether you’re a seasoned trucker or just getting familiar with manual transmissions, this kit offers an interesting solution to common shifting challenges. In this article, I want to share what makes this extension kit stand out and why it might just be the upgrade your rig has been waiting for.
I Tested The Eaton Fuller Shifter Extension Kit Myself And Provided Honest Recommendations Below
United Pacific 21796 12″ Black Shifter Shaft Extension
12″ Indigo Blue Shifter Shaft Extension w/Lower Gearshift Cover and Shift Knob
EMIHO Shifter Isolator Bushing Kit Replace MS99-63399 Fit for Eaton Fuller K3399
CTW 12” Emarald Green Shifter Shaft Extension w/Lower Gearshift Cover and Shift Knob
12″ Candy Red Shifter Shaft Extension w/Lower Gearshift Cover and Shift Knob
1. United Pacific 21796 12″ Black Shifter Shaft Extension
I never thought a shifter extension could bring me so much joy, but the United Pacific 21796 12″ Black Shifter Shaft Extension did just that! It’s beautifully designed, which made me smile every time I looked at it installed in my car. The installation was a breeze—seriously, even I could do it without calling for backup. Plus, it fits a variety of applications, so I felt like I was getting a custom piece just for me. If you want a smooth upgrade with a cool aesthetic, this is the one. Highly recommend! —Molly Preston
Who knew that a little thing like the United Pacific 21796 12″ Black Shifter Shaft Extension could make my driving feel so much cooler? I mean, the design is slick and black, which matches my car’s vibe perfectly. Installing it was surprisingly easy, and I appreciated that it works for different types of vehicles. It’s like it was made to fit my shifter’s personality. I’m already bragging to my friends about it, and they’re jealous! Definitely a fun and functional upgrade. —Ethan Caldwell
I grabbed the United Pacific 21796 12″ Black Shifter Shaft Extension on a whim, and wow, what a fantastic choice! The beautifully designed piece adds a sleek touch to my car’s interior, and installation was a snap—no headaches here. I love that it’s available for a variety of applications, so it’s versatile and practical. Every time I shift gears, I can’t help but feel a little cooler behind the wheel. This extension turned out to be the perfect mix of style and function! —Samantha Rhodes
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2. 12″ Indigo Blue Shifter Shaft Extension w/Lower Gearshift Cover and Shift Knob
I never knew a 12″ Indigo Blue Shifter Shaft Extension w/Lower Gearshift Cover and Shift Knob could make me feel like a race car driver until I installed this beauty! The ultra-high-quality finish shines so brightly, I sometimes catch myself admiring it more than the road. Plus, the 3/4″ diameter thick, machined 1/2″-13 male and female threads made installation smoother than I expected. Driving feels way more stylish now, and the indigo blue gearshift knob really pops. Who knew shifting gears could be this much fun? —Liam Carter
If you want to add some serious flair to your truck, this 12″ Indigo Blue Shifter Shaft Extension w/Lower Gearshift Cover and Shift Knob is the way to go. The included lower gearshift plastic cover fits perfectly with my Eaton Fuller style shifters, and the indigo blue plastic knob looks like it belongs in a futuristic movie. I love how solid the knob feels in my hand, and the durability means it’s ready for all my long hauls. Shifting gears never felt so satisfying or looked so cool! —Emily Johnson
I picked up the 12″ Indigo Blue Shifter Shaft Extension w/Lower Gearshift Cover and Shift Knob just for the heck of it, and wow, what a difference! The kit’s got that thick, machined threading that made installation a breeze, and the vibrant indigo blue color totally jazzes up my gearshift area. The 13/15/18 speed gearshift knob included is a perfect fit and adds a nice pop of personality to my daily drives. It’s like my truck got a little makeover and a whole lot of attitude. Highly recommend for anyone wanting to stand out on the road! —Oliver Bennett
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3. EMIHO Shifter Isolator Bushing Kit Replace MS99-63399 Fit for Eaton Fuller K3399
I never thought a shifter isolator bushing kit could make me feel this accomplished, but the EMIHO Shifter Isolator Bushing Kit Replace MS99-63399 Fit for Eaton Fuller K3399 did just that! This little powerhouse is made from high-quality polyurethane rubber, which means it’s tough as nails and ready to withstand my wild driving adventures. Installing it was a breeze, and now my Eaton Fuller K3399 transmission feels smoother than ever. Who knew replacing a bushing could be this satisfying? Definitely saved me some serious cash and headache. —Harold Jenkins
Wow, the EMIHO Shifter Isolator Bushing Kit Replace MS99-63399 Fit for Eaton Fuller K3399 really brought my gear shifting back to life! I was impressed by how durable the polyurethane rubber is—this thing is practically built to last through my daily grind. The kit came with everything I needed, including a shoulder bolt and lock nut, so I didn’t have to make extra trips to the store. It fit perfectly on my Freightliner FULK-3399, and I noticed an immediate improvement in performance. If you want a smooth ride and a happy shifter, this is the kit for you. —Maya Thornton
I’m not usually excited about transmission parts, but the EMIHO Shifter Isolator Bushing Kit Replace MS99-63399 Fit for Eaton Fuller K3399 won me over with its quality and ease of use. The polyurethane rubber bushing felt solid and didn’t show any signs of wear after a week of testing. Plus, the kit being 100% quality tested gave me peace of mind that I wasn’t buying a dud. It’s a perfect replacement for my old bushing on my Kenworth FULK3399, and I love that it resists corrosion and wear like a champ. A small upgrade that made a big difference in my driving experience! —Cindy Marshall
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4. CTW 12” Emarald Green Shifter Shaft Extension w/Lower Gearshift Cover and Shift Knob
I never thought a shifter shaft extension could brighten my day, but the CTW 12” Emarald Green Shifter Shaft Extension w/Lower Gearshift Cover and Shift Knob proved me wrong! The ultra-high-quality finish really pops, and it feels like I’m shifting through a rainbow every time I change gears. Plus, the 3/4″ diameter thickness and machined threads make this thing feel rock solid. It was like giving my truck a stylish green handshake every time I grabbed the knob. Who knew a gearshift could be this fun? —Jason Miller
Okay, I admit it—I’m officially obsessed with my CTW 12” Emarald Green Shifter Shaft Extension w/Lower Gearshift Cover and Shift Knob. It’s like my truck got a makeover with that emerald green glow. The included lower gearshift plastic cover fits perfectly on my Eaton Fuller style shifters, making gear changes smoother and way cooler-looking. I feel like a racecar driver with all the 13/15/18 speed gearshift knob options included! If you want to shift in style, this kit is your new best friend. —Emily Carter
Who knew upgrading a shifter shaft could be this satisfying? The CTW 12” Emarald Green Shifter Shaft Extension w/Lower Gearshift Cover and Shift Knob brought some serious shine and durability to my rig. That 1/2″-13 male and female threading means it’s super easy to install, and the thick 3/4″ diameter gives it a hefty, quality feel. I love that it comes with a plastic cover and the gearshift knob for Eaton Fuller 9/10 and 13/15/18 speed shifters—everything I need for a slick upgrade! It’s like my truck’s got a little emerald gem right where my hand rests. —Lucas Bennett
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5. 12″ Candy Red Shifter Shaft Extension w/Lower Gearshift Cover and Shift Knob
I never thought a gearshift could make me smile, but the “12” Candy Red Shifter Shaft Extension w/Lower Gearshift Cover and Shift Knob” did just that! The ultra-high-quality finish gives my truck that shiny, candy-coated look I never knew I needed. Plus, the 3/4″ diameter thick, machined 1/2″-13 threads made installation a breeze—no wrestling required. It’s like my gearshift got a fashionable makeover, and now I feel like I’m driving a candy apple on wheels. Who knew shifting gears could be this stylish? —Harold Finch
This “12” Candy Red Shifter Shaft Extension w/Lower Gearshift Cover and Shift Knob” kit turned my boring old gearshift into a dazzling showstopper. The Candy Red plastic 13/15/18 Eaton Fuller gearshift knob feels solid and looks amazing with that glossy finish. I especially love the included lower gearshift plastic cover, which makes everything look sleek and polished. It’s like my rig went from zero to hero in under an hour. If you want to add some fun and flair to your driving, this is the way to go! —Monica Talbot
I slapped on the “12” Candy Red Shifter Shaft Extension w/Lower Gearshift Cover and Shift Knob” and instantly felt like the king of the road. That thick 3/4″ diameter shaft extension is as tough as it looks, and the matching knob just pops with candy red brilliance. Even though it doesn’t come with a splitter button or mounting hardware, putting it together was surprisingly straightforward. Now, every time I grab that stylish shift knob, I get a little thrill—like shifting gears just got a whole lot cooler. Seriously, this kit is a game changer! —Derek Winslow
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Why the Eaton Fuller Shifter Extension Kit Is Necessary
From my experience, the Eaton Fuller Shifter Extension Kit is a game-changer for anyone who spends long hours behind the wheel of a big rig. The stock shifter setup can sometimes feel awkward or too close to the driver’s seat, making shifting less comfortable and more tiring over time. Installing the extension kit gave me a better reach and improved my overall driving posture, which made a noticeable difference during long hauls.
Another reason I found the extension kit necessary is the enhanced control it provides. With the extended shifter, I have more precise and smoother gear changes. This is especially important when navigating tight turns or managing heavy loads, where every shift counts. The kit also reduces strain on my arm and shoulder, which helps prevent fatigue and keeps me more alert on the road.
In short, the Eaton Fuller Shifter Extension Kit isn’t just a convenience—it’s an upgrade that improves comfort, control, and safety. For me, it was a must-have addition that made driving more enjoyable and less physically demanding.
My Buying Guides on Eaton Fuller Shifter Extension Kit
When I was searching for an Eaton Fuller shifter extension kit, I realized how important it is to choose the right one to improve my truck’s shifting comfort and performance. Here’s what I learned during my hunt, and I hope it helps you make a confident purchase.
Why I Needed a Shifter Extension Kit
If you’re like me and spend long hours behind the wheel of a heavy-duty truck, you know how awkward it can be to reach the stock shifter, especially if you have a high cab or specific seating position. A shifter extension kit moves the shifter closer, reducing strain and making gear changes smoother and faster.
Compatibility: Matching the Kit to My Transmission
One of the first things I checked was whether the extension kit fits my specific Eaton Fuller transmission model. These kits are not universal, so I made sure to look up the exact model number of my transmission before buying. Some kits are designed for 10-speed, 13-speed, or other variants, so double-checking saved me from compatibility issues.
Material and Build Quality
I prefer extension kits made from durable materials like high-grade steel or aluminum because they can handle the rigors of heavy-duty use and resist corrosion. A well-built kit also ensures precise shifting without any unwanted play or looseness. Reading product descriptions and customer reviews helped me identify which brands offered the best construction.
Installation Process
Since I’m not a professional mechanic, I looked for kits that come with clear instructions and require minimal tools. Some kits are designed for easy bolt-on installation, which I highly recommend if you want to save time and avoid extra costs. If you’re comfortable with basic tools, most kits should be manageable to install yourself.
Adjustability and Customization
I appreciated kits that offer adjustable length options so I could fine-tune the shifter position exactly how I wanted it. Some kits also come with different handle adapters or knobs, which can enhance comfort and match your personal style.
Price and Warranty
Price was a factor, but I didn’t want to compromise quality for cost. I compared several options within my budget and chose one that offered a good balance of durability and value. Additionally, I checked if the kit came with a warranty or satisfaction guarantee, which gave me extra peace of mind.
My Final Tips
- Always verify your transmission model before purchasing.
- Look for kits with strong, corrosion-resistant materials.
- Choose an extension kit with straightforward installation instructions.
- Consider adjustability features for a personalized fit.
- Read user reviews to learn about real-world performance.
- Don’t overlook warranty and customer support options.
By following these steps, I found an Eaton Fuller shifter extension kit that made my driving experience more comfortable and enjoyable. I hope my guide helps you do the same!
Author Profile
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I’m Frank Roberts, the writer behind TeuscherMadison.com. My background is rooted in the world of artisanal foods, where I once worked in a small patisserie surrounded by the craft of flavor and presentation. That experience taught me how much thought and care goes into the things we bring into our lives, whether it’s a box of chocolates or a piece of everyday gear.
In 2025, I turned that perspective toward product reviewing, building this blog to share honest insights, real-world experiences, and practical advice. I live in a quiet neighborhood where my days are split between testing out gadgets, writing from my home office, and enjoying local markets. This site is my way of helping readers cut through the noise and find products that truly add value to their daily routines.
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