Product Introduction

Crafted from high-strength ductile iron (QT500-7) via precision sand casting and CNC machining, this transmission auxiliary case housing is engineered to endure extreme mechanical stresses in heavy-haul scenarios. Its integrated dual-cavity structural design is optimized for the layout of high/low range gear sets, with precision-machined mounting faces, bolt hole arrays and bearing bores that strictly comply with OE tolerance standards (±0.02mm). The housing undergoes normalized heat treatment to eliminate casting internal stress, paired with anti-corrosion black paint coating for enhanced durability in harsh working environments. Key features include a sealed oil sump structure, integrated shift rail guide holes and reinforced rib design at stress concentration points, ensuring reliable support for internal transmission components while facilitating efficient lubrication and heat dissipation.

Core Function

• Acts as the rigid structural foundation of the transmission auxiliary case, providing precise positioning and stable mounting for range gears, synchronizers, shift forks and bearings.

• Forms a sealed lubrication cavity to store transmission oil, ensuring continuous lubrication of internal moving parts and preventing oil leakage and contamination ingress.

• Bears and distributes multi-directional dynamic loads generated during gear shifting and torque conversion, protecting internal components from deformation and damage.

• Serves as the mounting interface for the transmission main case, rear extension housing and shift control mechanism, ensuring the integrity and coaxiality of the entire transmission system.

• Enables direct OE replacement, with perfect dimensional compatibility to ensure quick assembly and consistent performance with the original transmission assembly.

Transmission Housing 199014320259 Sinotruk – Heavy-Duty Gearbox Casing for HOWO Trucks

When your heavy-duty truck demands reliable power transfer, every component inside the drivetrain matters. The Transmission Housing 199014320259 Sinotruk serves as the backbone of your gearbox assembly — shielding internal transmission components, bearing operational loads, and ensuring smooth gear engagement under the toughest conditions. Engineered to OEM specifications, this gearbox casing delivers the structural integrity that keeps your Sinotruk fleet running without costly downtime.

At Mettlead, we supply this genuine-spec transmission housing directly from our China-based facility, which means you get factory-direct pricing without sacrificing quality. Whether you’re managing a fleet overhaul or stocking your parts warehouse, this is the dependable solution your procurement team has been looking for.

Key Features and Benefits of Transmission Housing 199014320259

Precision-Engineered Protection

This Sinotruk transmission housing is purpose-built to encapsulate and protect internal drivetrain components — including gears, shafts, and synchronizers — from road debris, moisture, and mechanical shock. As a result, your transmission internals enjoy a longer service life even in harsh operating environments.

Superior Load-Bearing Capacity

Manufactured from high-strength cast materials, the housing withstands continuous rotational forces and vibration loads generated during heavy hauling. Consequently, it maintains dimensional stability over hundreds of thousands of kilometers.

OEM-Grade Fitment

Part number 199014320259 ensures a precise bolt-on fit for compatible Sinotruk HOWO vehicles. Therefore, installation is straightforward, reducing labor time and eliminating the need for costly modifications.

Strict Quality Control

Every transmission housing undergoes rigorous dimensional inspection and surface-finish verification before shipment. In other words, you receive a part that meets or exceeds original equipment standards every single time.

Cost-Effective Factory-Direct Supply

By sourcing directly through Mettlead, you bypass middlemen and enjoy competitive bulk pricing. Additionally, our flexible and secure payment methods make international procurement hassle-free.

Technical Specifications – Transmission Housing 199014320259 Sinotruk

Application Scenario – Where This Transmission Housing Performs

The Transmission Housing 199014320259 is specifically designed for Sinotruk HOWO heavy-duty vehicles. It functions as the outer shell of the gearbox assembly, and its primary roles include:

• Protecting internal transmission components — gears, bearings, and shift forks stay shielded from contaminants and impact.
• Bearing operational loads — the housing absorbs torque reactions and vibration forces generated during acceleration, braking, and gear changes.
• Maintaining alignment — precise machining ensures all internal shafts and gears remain in correct positional tolerance.
• Supporting auxiliary mounting — provides attachment points for sensors, the clutch housing, and the rear extension housing.

In short, if your Sinotruk truck’s gearbox casing is cracked, corroded, or dimensionally compromised, replacing it with this OEM-spec housing restores full drivetrain reliability. Explore more compatible parts on our Sinotruk HOWO Truck Parts brand page.

OEM / ODM Capability

Mettlead understands that different markets have different branding requirements. That’s why we offer flexible OEM and ODM services for the Transmission Housing 199014320259 Sinotruk:

• White-Label Packaging — receive parts in neutral boxes, ready for your own branding.
• Custom Packaging — we print your logo, part numbers, and barcodes directly on the packaging.
• Custom Labeling — individual part labels tailored to your inventory system.
• Bulk Order Flexibility — whether you need 10 pieces or 1,000, our production line scales to your demand.

Moreover, our factory welcomes on-site visits so you can inspect production processes and quality control firsthand. Browse our full Sinotruk truck parts catalog to discover additional components for your sourcing list.

Frequently Asked Questions – Transmission Housing 199014320259 Sinotruk

What vehicles does the Transmission Housing 199014320259 fit?

This transmission housing is designed to fit Sinotruk HOWO heavy-duty trucks that use the gearbox assembly corresponding to OEM part number 199014320259. It is always recommended to verify the part number against your vehicle’s transmission model before ordering.

What material is this gearbox casing made from?

The housing is manufactured from high-strength cast iron or aluminum alloy, depending on the OEM specification for the specific transmission variant. Both materials provide excellent rigidity and heat dissipation under heavy loads.

How can I tell if my transmission housing needs replacement?

Common signs include visible cracks on the casing surface, oil leaks around the housing seams, unusual noise from the gearbox area, or misalignment symptoms during gear engagement. If you notice any of these, inspecting the housing for structural damage is a wise first step.

Is this an original Sinotruk part or aftermarket?

This is a high-quality aftermarket replacement manufactured to OEM-equivalent specifications. It matches the original part in dimensions, material grade, and mounting configuration, ensuring a direct bolt-on fit.

Does the transmission housing come with gaskets or seals?

Typically, the housing is supplied as a standalone component. However, if you need matching gaskets, seals, or related transmission parts, feel free to inquire — we carry a comprehensive range of drivetrain and rear axle components as well.

What quality checks does this part undergo before shipping?

Each transmission housing passes through dimensional measurement, surface-finish inspection, and pressure-point testing. Our strict quality control process ensures zero tolerance for casting defects, porosity, or machining errors.

Ready to Source Your Transmission Housing 199014320259 Sinotruk?

Stop letting drivetrain failures slow down your fleet operations. The Transmission Housing 199014320259 Sinotruk from Mettlead gives you OEM-grade reliability at factory-direct pricing — backed by fast delivery and professional export packaging.

Get your competitive quote today. Send us your required quantity, destination port, and any custom packaging needs. Our team typically responds within 24 hours with pricing and lead time.

👉 Contact Us Now to Request a Quote

Mettlead — Your trusted China-based supplier for Sinotruk, HOWO, Shacman, FAW, Weichai, Dongfeng, and Foton heavy truck parts. Factory-direct quality, worldwide delivery.