Product Introduction

• Structure: A precision-forged gear made from high-strength alloy steel, with a carburized and hardened tooth surface for maximum wear resistance. It features an internal spline bore that locks onto the axle shaft and a tapered tooth profile for smooth meshing with differential spider gears.

• Performance: The high-hardness tooth surface withstands the high torque and impact forces of heavy-duty operation, ensuring reliable power transmission and long service life. The precision-machined tooth profile ensures smooth meshing with spider gears, minimizing noise and vibration.

Core Function

1. Torque Distribution: Receives torque from the differential spider gears and transmits it to the axle shaft, enabling power transfer to the drive wheel.

2. Differential Action: The tapered tooth profile allows smooth rotation relative to the spider gears, enabling differential speed between the left and right wheels during cornering.

3. Wear Resistance: The carburized and hardened tooth surface resists pitting and wear, maintaining gear integrity even under prolonged heavy load.

Gear 812W35108-0078 Sinotruk Sitrak – Transmission Drive Gear for Heavy-Duty Trucks

When your Sinotruk Sitrak truck demands reliable power transfer through every gear shift, precision-engineered components make all the difference. The Gear 812W35108-0078 is a critical transmission drive component designed specifically for Sitrak heavy-duty vehicles. At Mettlead, we supply this OEM-standard gear directly from the factory floor to your workshop — eliminating middlemen, reducing costs, and ensuring you receive a genuine-quality part that keeps your fleet moving without interruption.

Whether you are maintaining a long-haul logistics fleet or operating construction haulage trucks, this gear delivers the durability and precision your transmission system needs. Moreover, because we specialize in Chinese brand truck parts, you can trust that every tooth profile and hardness specification meets the exact standards your Sitrak gearbox requires.

Key Features and Benefits of Gear 812W35108-0078

Choosing the right transmission gear is not just about fitment — it is about long-term performance, reduced downtime, and total cost of ownership. Here is why fleet managers and procurement professionals consistently choose this part through Mettlead:

• Exact OEM Fitment: Manufactured to match the original Sinotruk Sitrak specifications, so installation is seamless and performance is guaranteed from day one.
• Premium Material Composition: Forged from high-grade alloy steel, this gear offers superior wear resistance and fatigue strength under heavy load conditions.
• Precision Heat Treatment: Advanced carburizing and quenching processes ensure optimal surface hardness while maintaining a tough core — extending service life significantly.
• Smooth Power Transmission: Carefully machined tooth profiles minimize noise, vibration, and energy loss during gear engagement, resulting in smoother shifting.
• Factory-Direct Pricing: By sourcing directly from Mettlead, you bypass distributors and enjoy wholesale pricing without sacrificing quality assurance.
• Strict Quality Control: Every batch undergoes dimensional inspection, hardness testing, and surface finish verification before shipment.

In addition to these advantages, our flexible payment methods and reliable global shipping network mean you receive your parts on time — regardless of your location. Consequently, your maintenance schedule stays on track and your vehicles remain productive.

Technical Specifications – Gear 812W35108-0078

Below you will find the detailed parameters for this Sinotruk Sitrak transmission gear. These specifications help procurement teams verify compatibility and plan maintenance with confidence:

If you need additional technical data such as module, tooth count, or pitch diameter for cross-referencing purposes, our engineering team is ready to assist. Simply contact us with your requirements.

Application Scenario – Where Does Gear 812W35108-0078 Fit?

This gear is engineered as a transmission drive component within the gearbox assembly of Sinotruk Sitrak heavy-duty trucks. It plays a vital role in transferring engine torque through the transmission, ultimately enabling the vehicle to operate efficiently across various speed ranges.

Specifically, this part is suitable for the following applications:

• Compatible Vehicle Series: Sinotruk Sitrak C7H, G7, T7H and related heavy-duty truck models equipped with standard Sitrak transmission assemblies.
• System Application: Gearbox transmission drive — responsible for meshing with counter gears to achieve required speed and torque ratios.
• Operating Environment: Designed to withstand continuous heavy-load operation in long-haul freight, construction material transport, and mining logistics.

Therefore, whether your fleet handles intercity cargo routes or demanding off-road construction hauling, this gear maintains consistent performance under pressure. For the full range of gearbox components, explore our gearbox transmission parts category.

OEM / ODM Capability and Custom Packaging

At Mettlead, we understand that different markets have different branding requirements. That is why we offer flexible OEM and white-label services for the Gear 812W35108-0078 and our entire product range:

• White-Label Packaging: Receive parts in neutral packaging — ready for your own brand labels and distribution channels.
• Custom Packaging: We can design and print packaging with your company branding, logo, and part numbering system for a professional market presence.
• Bulk Order Support: Whether you need 10 pieces or 10,000 pieces, our production capacity scales to match your demand with consistent lead times.
• Quality Documentation: We provide inspection reports, material certificates, and packing lists to support your procurement documentation requirements.

Furthermore, our facility welcomes on-site visits. If you wish to inspect production quality firsthand, we will arrange a factory tour at your convenience. Discover our complete lineup of Sitrak components on the Sitrak heavy-duty parts brand page.

Frequently Asked Questions – Gear 812W35108-0078 Sinotruk Sitrak

What is the function of Gear 812W35108-0078 in the Sitrak transmission?

This gear serves as a transmission drive component within the gearbox assembly. It meshes with corresponding counter gears to transmit rotational power from the engine to the drivetrain. Essentially, it helps your truck shift between speed ratios smoothly and efficiently under load.

Is Gear 812W35108-0078 a direct replacement for the original Sitrak part?

Yes. This gear is manufactured to OEM-equivalent specifications, meaning it matches the original dimensions, material grade, hardness, and tooth profile. As a result, it installs directly without modification and performs identically to the factory-fitted component.

What material is this transmission gear made from?

The gear is forged from high-grade alloy steel and then undergoes a carburizing and quenching heat treatment process. This combination produces a hard, wear-resistant surface layer while retaining a tough, shock-absorbing core — ideal for the high-stress environment inside a heavy-duty gearbox.

How can I verify that this gear fits my specific Sitrak truck model?

The most reliable method is to confirm the OEM part number 812W35108-0078 against your vehicle’s parts catalog or existing component. If you are unsure, send us your truck model, VIN number, or a photo of the old part, and our team will verify compatibility for you.

What causes premature wear on transmission gears like 812W35108-0078?

Common causes include insufficient or degraded gearbox oil, misaligned shafts, overloading beyond rated capacity, and using non-specification replacement parts. Regular transmission oil changes and using OEM-standard gears significantly extend component lifespan.

Can I order this gear with custom packaging or my own brand label?

Absolutely. Mettlead offers white-label and fully customized packaging options. This service is particularly valuable for distributors and resellers who want consistent brand presentation across their product lines.

For a comprehensive overview of all available Sinotruk Sitrak truck parts — organized by system and category — visit our Sinotruk Sitrak truck parts full category guide.

Get a Competitive Quote for Gear 812W35108-0078 Today

Ready to secure factory-direct pricing on the Gear 812W35108-0078 for your Sinotruk Sitrak fleet? Mettlead makes the procurement process simple, fast, and transparent. Here is what you can expect when you reach out:

1. Quick Response: Receive a detailed quotation within 24 hours of your inquiry.
2. Competitive Pricing: Factory-direct rates with volume discounts for bulk orders.
3. Flexible Payment: Multiple secure payment options tailored to international B2B transactions.
4. Fast Delivery: Efficient logistics partnerships ensure timely arrival at your destination.

Do not let gearbox downtime cost your fleet revenue. Contact us now to request pricing, confirm part compatibility, or discuss your bulk procurement needs. Our specialist team is standing by to support your business.