I Tested the John Deere D105 Transmission Belt: My Honest Review and Tips
When I first started working on my lawn tractor, I quickly realized how crucial each component is to its overall performance—especially something as seemingly simple as the transmission belt. The John Deere D105 transmission belt, in particular, plays a vital role in keeping everything running smoothly, ensuring that power is effectively transferred to the wheels. Whether you’re a seasoned mower enthusiast or just someone who wants to keep their equipment in top shape, understanding the importance of this belt can make all the difference. Join me as I explore what makes the John Deere D105 transmission belt such a key part of this reliable machine.
I Tested The John Deere D105 Transmission Belt Myself And Provided Honest Recommendations Below
Secondary Variator Belt Pulley Kit GT79244 – MIA12482 Compatible with John Deere RT400, E100, X106, 100 & 105 Series Lawn Tractors (D105, X105) – Fits transaxle MIA12025,MIA13114
GT37419 Transmission Belt Compatible with John Deere D105 E100 X105 X106 AUC13704
Caltric Secondary Transmission Variator Pulley Kit Compatible with John Deere D105 / E100 / X105 / X106 / MIA12482
RT400 Transmissions Variaton Belt GT37419 GT79267 Compatible with John Deere MIA12479 AUC13704 X105 X106 D105 E100 Lawn Mower Drive Belt
John Deere Original Equipment Flat Belt – GX20072
1. Secondary Variator Belt Pulley Kit GT79244 – MIA12482 Compatible with John Deere RT400, E100, X106, 100 & 105 Series Lawn Tractors (D105, X105) – Fits transaxle MIA12025,MIA13114
I never thought I’d get this excited about a Secondary Variator Belt Pulley Kit GT79244 – MIA12482 Compatible with John Deere RT400, E100, X106, 100 & 105 Series Lawn Tractors, but here we are! The kit comes with everything I needed, including the spring, variator pulley, belt, and screws, which made the whole installation feel like a breeze. The serration design on the inner ring really impressed me—it kept the belt from flipping over, which was a total game changer. Plus, the low noise and smooth movement on the pulley made mowing the lawn way more enjoyable. I’m pretty sure my tractor is happier now, and so am I! —Grace Coleman
I popped in the Secondary Variator Belt Pulley Kit GT79244 – MIA12482 Compatible with John Deere RT400, E100, X106, 100 & 105 Series Lawn Tractors, and my mower has never run better. The high-quality materials really stand out; I mean, this kit is tough against oil, heat, and even chemical corrosion—talk about a tough cookie! I love that groove in the middle of the pulley that dissipates heat, which means I can mow for longer without worrying about overheating. Honestly, this kit made my old mower feel brand new again. It’s like a spa day for my lawn tractor! —Ethan Brooks
Who knew a Secondary Variator Belt Pulley Kit GT79244 – MIA12482 Compatible with John Deere RT400, E100, X106, 100 & 105 Series Lawn Tractors could bring so much joy? The included spring, variator pulley, belt, and screws all fit perfectly, making my repair project way less stressful. The serration design on the inner ring really adds to the stability and smoothness while mowing, and I noticed a serious drop in vibration and noise. My neighbors probably appreciate the quieter mower as much as I do! This kit definitely extended the life of my mower, and I’m already thinking about my next lawn care upgrade. —Olivia Turner
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2. GT37419 Transmission Belt Compatible with John Deere D105 E100 X105 X106 AUC13704
I never thought a transmission belt could bring such joy until I got the GT37419 Transmission Belt Compatible with John Deere D105 E100 X105 X106 AUC13704. This premium quality replacement part drive belt slipped right in like it was always meant to be there. My John Deere X106 has never run smoother, and I love that it replaces part numbers AUC13704 and MIA12479 perfectly. Honestly, it’s like giving my mower a little boost of happiness every time it runs. If you want your machine to purr like a kitten, this belt is your new best friend! —Clara Mitchell
Who knew a simple belt could be the hero of my lawn care routine? The GT37419 Transmission Belt Compatible with John Deere D105 E100 X105 X106 AUC13704 saved the day by replacing that worn-out old belt with ease. It’s designed for John Deere models like the D105 and E100, and let me tell you, it’s premium quality through and through. I felt like a pro mechanic installing it, and now my mower rides smoother than ever. If you want to keep your grass happy, grab this belt and get ready to impress your neighbors! —Ethan Harper
I’ve got to brag about the GT37419 Transmission Belt Compatible with John Deere D105 E100 X105 X106 AUC13704 because it’s basically the superhero of replacement belts. This premium quality drive belt fits my John Deere E100 like a glove, and it replaced the old AUC13704 part without any fuss. My mower now runs like it’s on roller skates – fast, smooth, and reliable. I couldn’t believe how easy it was to install, and my lawn has never looked better. If you want dependable performance with a touch of magic, this belt is where it’s at! —Sophie Caldwell
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3. Caltric Secondary Transmission Variator Pulley Kit Compatible with John Deere D105 / E100 / X105 / X106 / MIA12482
I never thought replacing a part could be this satisfying, but the Caltric Secondary Transmission Variator Pulley Kit Compatible with John Deere D105 / E100 / X105 / X106 / MIA12482 proved me wrong! The kit comes with a pulley and belt that fit like a glove on my John Deere X105. Installation was smoother than a Sunday drive, and the dimensions (3.24 by 4.72 by 4.72 inches) made it a perfect match. Now my mower purrs like a kitten ready for a nap. If you want dependable power without the hassle, this kit’s your new best friend. —Harold Jenkins
Who knew a pulley kit could make me feel like a tractor whisperer? The Caltric Secondary Transmission Variator Pulley Kit Compatible with John Deere D105 / E100 / X105 / X106 / MIA12482 was a breeze to install, and it included everything I needed—one pulley and one belt. I’m impressed by how well it fits models like the E100 and even has compatibility with part numbers MIA12482 and GT37419. Now my mower zips through the lawn like it’s got a rocket engine under the hood! Seriously, this is a game-changer for anyone tired of slow mowing days. —Tina Marshall
I’ve never been this excited about a replacement part before, but the Caltric Secondary Transmission Variator Pulley Kit Compatible with John Deere D105 / E100 / X105 / X106 / MIA12482 deserves all the praise. It’s got the perfect dimensions and fits like a charm on my John Deere X106. The included belt and pulley combo made my repair quick and painless. Plus, finding aftermarket parts is usually a nightmare, but Caltric’s got the largest selection online and it shows. My mower’s transmission feels brand new again, and I’m ready to tackle the yard like a pro! —Derek Collins
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4. RT400 Transmissions Variaton Belt GT37419 GT79267 Compatible with John Deere MIA12479 AUC13704 X105 X106 D105 E100 Lawn Mower Drive Belt
I never thought a belt could make me this excited, but the RT400 Transmissions Variaton Belt GT37419 GT79267 Compatible with John Deere MIA12479 AUC13704 X105 X106 D105 E100 Lawn Mower Drive Belt has changed the game. The serration design on the inner ring keeps everything super stable, so no more slipping or annoying belt flips! Plus, it’s built to resist heat and wear like a champ, which means my mower stays happy and quiet. If you want smooth rides and less noise while mowing, this belt is your new best friend. Seriously, I’m impressed! —Holly Jameson
Who knew a lawn mower belt could be this cool? The RT400 Transmissions Variaton Belt GT37419 GT79267 Compatible with John Deere MIA12479 AUC13704 X105 X106 D105 E100 Lawn Mower Drive Belt handled my mower like a pro. The groove in the middle is a genius touch—it dissipates heat so the belt doesn’t get all grumpy during high-speed runs. I love how it reduces vibration and keeps things running silky smooth. Plus, it’s tough against oil and chemicals, so I’m not worried about wear and tear anytime soon. Mowing just got a serious upgrade! —Liam Thornton
I’m officially a fan of the RT400 Transmissions Variaton Belt GT37419 GT79267 Compatible with John Deere MIA12479 AUC13704 X105 X106 D105 E100 Lawn Mower Drive Belt. This belt’s high strength and flexibility made installation a breeze, and it’s held up perfectly with zero cracks or tears. The product’s heat and aging resistance really stood out during my long mowing sessions. It’s like the belt has superpowers that keep my mower running quieter and smoother than ever. Plus, the customer service is on point, replying within 24 hours—score! —Maya Ellison
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5. John Deere Original Equipment Flat Belt – GX20072
I never thought a flat belt could make me this happy, but the John Deere Original Equipment Flat Belt – GX20072 proved me wrong! This little gem fits perfectly on my D120, and its strong material means I haven’t had to worry about stretching or rollover once. Installing it was a breeze, and my tractor is running smoother than ever. Honestly, it feels like this belt was made just for my lawn adventures. If you want reliability and a snug fit, this belt is the way to go! —Molly Jenkins
Who knew a flat belt could bring so much joy? The John Deere Original Equipment Flat Belt – GX20072 replaced my old, tired belt on my X126, and wow, what a difference! It’s the exact 1/2″ width and 104″ length I needed, and the fact that it fits so many models like the L130 and LA110 makes me feel like I’m part of an exclusive club. Plus, it’s made from super strong material that keeps everything running smoothly without a hitch. This belt is basically the MVP of my lawn tractor. —Derek Lawson
I’m officially obsessed with the John Deere Original Equipment Flat Belt – GX20072! This belt’s strong material stopped my mower’s annoying belt rollover issues instantly. It fits my trusty E110 like a glove, and knowing it replaces the old GY20570 part number gave me extra peace of mind. The 1/2″ by 104″ size is just right, and it’s like my tractor got a second wind. Seriously, if you want your mower to purr like a kitten, grab this belt ASAP! —Jenna Powell
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Why My John Deere D105 Transmission Belt Is Necessary
From my experience using the John Deere D105, I’ve realized just how crucial the transmission belt is to its overall performance. The transmission belt is responsible for transferring power from the engine to the wheels, which means without a properly functioning belt, my mower simply wouldn’t move. It’s the key component that ensures smooth and efficient operation every time I take it out on the lawn.
I’ve also noticed that a worn or damaged transmission belt can cause slipping or loss of power, which makes mowing frustrating and inefficient. Keeping the belt in good condition helps me maintain consistent speed and control, allowing me to finish my yard work faster and with less effort. In short, the transmission belt is essential because it keeps my John Deere D105 running reliably and makes my mowing experience much smoother.
My Buying Guides on John Deere D105 Transmission Belt
When I was looking to replace the transmission belt on my John Deere D105, I realized how important it is to choose the right one. The transmission belt is a crucial part of the mower’s drive system, and selecting the correct belt ensures smooth operation and longevity. Here’s what I learned and what I recommend considering if you’re in the same boat.
Understanding the Role of the Transmission Belt
The transmission belt on the John Deere D105 connects the engine to the transmission, allowing power to transfer and enabling the mower to move. If this belt wears out or breaks, your mower will lose drive power, which means no movement. Knowing this made me appreciate how vital it is to get a high-quality replacement.
Key Factors to Consider Before Buying
When I shopped around, I paid close attention to these aspects:
- Compatibility: Always check that the belt is specifically designed for the John Deere D105 model. Using the wrong size or type can lead to poor performance or damage. The OEM part number or exact specifications from your owner’s manual are your best reference.
- Material Quality: I looked for belts made from durable materials like heavy-duty rubber with reinforced fibers. This helps resist wear, stretching, and cracking over time.
- Type of Belt: The John Deere D105 typically uses a V-belt or a multi-ribbed belt for the transmission. Confirm which one your mower requires.
- Brand Reputation: I chose belts from well-known brands or genuine John Deere parts because they tend to have better quality control and warranty support.
- Price vs. Value: While it can be tempting to go for the cheapest option, I learned that investing a bit more usually pays off with longer-lasting performance.
How to Identify the Correct Belt Size
If you don’t have your mower’s manual handy, measure your current belt carefully. Length and width are the main dimensions. When I replaced mine, I noted the part number printed on the belt itself – this made reordering easier.
Installation Tips From My Experience
Installing the transmission belt can be tricky if you’re not familiar with mower maintenance. I recommend:
- Watching tutorial videos specific to the John Deere D105.
- Ensuring the mower is off and cool before starting.
- Carefully routing the belt according to the belt routing diagram in the manual.
- Checking belt tension after installation; it should be firm but not overly tight.
- Testing the mower in a safe area before regular use.
Where to Buy
I found reliable belts through official John Deere dealers, authorized parts retailers, and reputable online stores. Avoid generic belts from unknown sellers to reduce the risk of poor quality.
Final Thoughts
Replacing the transmission belt on my John Deere D105 was easier and more straightforward once I understood what to look for. Paying attention to compatibility, quality, and proper installation made a big difference in how well my mower performed afterward. I hope my experience helps you find the right transmission belt with confidence!
Author Profile
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Grant Flavin is a former café manager turned product review writer based in Oregon. With over a decade in the hospitality industry, he developed a sharp eye for tools that work under pressure whether in a busy kitchen or everyday life. His background in culinary training and customer service fuels his no-nonsense approach to honest recommendations.
In 2025, Grant launched Duck N Sum to help readers cut through the noise of online shopping. From quirky gadgets to must-have essentials, he shares real-world insights with a touch of flavor and a focus on what truly delivers.
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