The RC4WD Marlin is a popular scale crawler known for its realistic looks and capable chassis. However, many owners find that the stock suspension can be improved for better articulation and traction. The Tearflex suspension upgrade offers a practical solution. This guide covers the Tearflex upgrade, its part number for the Marlin, and what to expect from the installation and performance.
What Is the Tearflex Suspension Upgrade?
The Tearflex suspension system is designed to provide maximum flex and articulation for RC crawlers. Unlike traditional leaf springs or solid axles, Tearflex uses flexible composite elements that allow each wheel to move independently over obstacles. This design mimics the real-world rock crawling suspension, helping the tires maintain contact with the ground.
For the RC4WD Marlin, the upgrade replaces the stock leaf springs or four-link setup with a Tearflex system. This significantly increases wheel travel and reduces the chance of lifting a tire on uneven terrain. The result is improved traction and climbing ability.
Key Features of Tearflex Suspension
- High articulation: Each corner can flex independently, keeping tires on the ground.
- Durable composite material: Resists cracking and fatigue under heavy use.
- Easy installation: Designed as a direct bolt-on upgrade for specific models.
- Adjustable preload: Allows tuning for different terrain and weight.
Tearflex Suspension Upgrade Part Number for RC4WD Marlin
The correct part number for the Tearflex suspension upgrade kit compatible with the RC4WD Marlin (typically the Marlin C2 or Marlin 4-door) is TFU-100. Some listings may refer to it as "Tearflex Universal Crawler Suspension Kit" but confirm it fits the Marlin's axle width and mounting points. Always double-check with the manufacturer or seller before purchase.
Important: If you have the Marlin with a longer wheelbase (e.g., 4-door version), you may need an extension kit or additional Tearflex elements. Contact the Tearflex support for exact fitment.
Performance Benefits of the Tearflex Upgrade
Installing the Tearflex suspension on the RC4WD Marlin brings several improvements:
1. Enhanced Articulation
Stock suspension on the Marlin often limits wheel travel to around 30 degrees of flex. The Tearflex system can increase that to 60+ degrees, allowing the chassis to twist significantly without binding. This means your Marlin can crawl over large rocks and logs where other rigs would lift a tire.
2. Improved Traction
With more consistent tire contact, you gain better grip. The Tearflex elements conform to the terrain, so the tires press down more evenly. This is especially beneficial on loose surfaces like gravel or dirt.
3. Reduced Body Roll
Because the suspension moves independently per corner, the chassis stays more stable side-to-side compared to a four-link setup. This helps prevent rollovers on off-camber sections.
4. Durability
Tearflex elements are made from a proprietary composite that resists UV damage and fatigue. They won't sag over time like some coil springs. They also require minimal maintenance – just occasional cleaning.
Installation Guide: Tearflex on the RC4WD Marlin
Installing the Tearflex suspension is a moderate difficulty task. Basic tools required: hex wrenches (metric), screwdrivers, and possibly a small file for slight modifications. Below is a general outline.
Step 1: Remove Stock Suspension
- Take off the wheels and tires.
- Remove the stock leaf springs or four-link bars. Save the axle mounting hardware if reusable.
- Carefully unclip any shock absorbers (if present). The Tearflex kit does not use shocks.
Step 2: Prepare the Axles and Chassis
- Clean the axle housings and chassis rails.
- Some Marlin versions require drilling small holes for the Tearflex mounting brackets. The kit includes a template. Measure twice and drill accurately.
- File any burrs to prevent stress on the Tearflex elements.
Step 3: Install the Tearflex Elements
- Attach the Tearflex elements to the axle brackets using the provided bolts and locknuts. Do not overtighten; the elements need to pivot freely.
- Then attach the chassis end of each element. Ensure the orientation matches the instruction: the curved side should face forward for the front axle, rearward for the rear.
Step 4: Set Preload and Ride Height
- The Tearflex kit includes small preload spacers. Start with the medium preload.
- Reinstall the wheels and set the truck on a level surface. Adjust preload to achieve a slight rake (front lower than rear) for climbing.
Step 5: Test and Tune
- Flex the suspension manually to check for binding. The elements should bend smoothly.
- Drive the Marlin over a small slope. If it feels too soft, add more preload; if too stiff, remove spacers.
Common Questions About Tearflex for the Marlin
Does the Tearflex upgrade work with aftermarket wheels and tires?
Yes. The upgrade does not affect wheel fitment. However, larger tires may require body trimming to avoid rubbing at full flex.
Can I keep the stock shocks?
The Tearflex system is designed to replace both springs and shocks. You can leave shocks installed, but they will not function with the flex elements. For a clean setup, remove them entirely.
How much does it cost?
The TFU-100 kit typically costs around $40 to $60. It is one of the more affordable suspension upgrades for the Marlin.
Is it compatible with the Marlin V2?
Yes, but check the axle width. The Marlin V2 has wider axles; the kit may require extra spacers (not included). Contact Tearflex for confirmation.
Final Recommendation
For RC4WD Marlin owners who want significant articulation improvement without breaking the bank, the Tearflex suspension upgrade with part number TFU-100 is a solid choice. It delivers noticeable gains in crawling ability and is relatively easy to install at home.
However, this upgrade is best for rock crawling and slow technical trails. If you drive your Marlin fast through rough bashing terrain, the Tearflex elements may feel too soft and can flop. In that case, consider a four-link with limiting straps instead.
Overall, if you prioritize low-speed traction and articulation, the Tearflex system is a worthy addition to your Marlin. Buy the kit, take your time with installation, and fine-tune the preload for your specific weight setup. You'll likely see a big difference on the rocks.