Product Introduction

• Structure: A heavy-duty auxiliary box synchronizer assembly, consisting of a high-strength alloy steel hub, sliding sleeve, dual-cone synchronizer rings (steel + friction material), and spring-loaded shift blocks. The hub and sleeve feature carburized and hardened teeth (HRC 58–62) for extreme wear resistance; the dual-cone design doubles synchronization capacity compared to single-cone types. The assembly is fully OE-matched for 12JS160T/12JSD160T gearboxes.

• Performance: Delivers fast, smooth high/low range shifting with minimal gear clash. The dual-cone friction surface rapidly equalizes gear speeds, while the high-hardness teeth ensure reliable torque transfer under heavy loads. Resists vibration, high temperatures (-40°C to +120°C), and millions of shift cycles.

Core Function

1. High/Low Range Synchronization: Uses dual-cone friction to match rotational speeds between high and low gear ranges, eliminating gear impact during range switching.

2. Smooth Range Shifting: Enables shock-free meshing of the sliding sleeve and range gear teeth, improving shift quality and extending component life.

3. Torque Transmission: Once synchronized, the sliding sleeve locks onto the range gear, transferring torque from the main box to the output shaft.

Synchronizer Assembly 12JS160T-1707140 Fast Gear – OEM-Quality Replacement for Heavy-Duty Trucks

When your Fast gearbox demands smooth, noise-free shifting under heavy loads, the Synchronizer Assembly 12JS160T-1707140 is the component that makes it happen. Engineered to match original Fast Gear specifications, this synchronizer assembly ensures precise gear engagement, reduces wear on transmission internals, and keeps your fleet moving without costly downtime. Whether you are rebuilding a gearbox or stocking critical spares, Mettlead delivers this part at factory-direct pricing with the reliability your supply chain requires.

Why This Synchronizer Assembly 12JS160T-1707140 Stands Out

A synchronizer assembly is the heart of any manual transmission’s shifting mechanism. It equalizes the rotational speed between gears before engagement, preventing grinding and extending gearbox life. Here is what makes the 12JS160T-1707140 Fast Gear Synchronizer Assembly from Mettlead a smart procurement decision:

• Precision-Machined Synchro Rings: Each friction surface is manufactured to tight tolerances, delivering consistent synchronization force across thousands of shift cycles.
• High-Grade Materials: The hub, sleeve, and blocking rings use wear-resistant alloys that withstand the torque demands of heavy-duty 12-speed Fast transmissions.
• Drop-In Fitment: Dimensionally identical to the OEM part number 12JS160T-1707140, so installation requires no modifications or adapter components.
• Smooth Shift Feel: Optimized cone angle and friction coefficient reduce shift effort, making the driver’s job easier and protecting the gearbox from forced engagement.
• Extended Service Life: Heat-treated surfaces resist scoring and glazing, meaning longer intervals between overhauls for your fleet.

Technical Specifications – Synchronizer Assembly 12JS160T-1707140

Application Scenarios – Which Vehicles Use the 12JS160T-1707140 Synchronizer Assembly?

The Synchronizer Assembly 12JS160T-1707140 is specifically designed for the Fast 12JS160T series transmission, one of the most widely used heavy-duty gearboxes across Chinese truck platforms. You will find this gearbox—and consequently this synchronizer—fitted to the following vehicle brands and models:

• SINOTRUK HOWO A7 / T7H: Long-haul tractor units equipped with 12-speed Fast transmissions.
• SHACMAN F3000 / X3000: Heavy-duty logistics and construction trucks relying on the 12JS160T gearbox for high-torque applications.
• FAW J6P / J7: Premium highway tractors paired with Fast Gear drivetrain systems.
• SINOTRUK SITRAK C7H: High-specification trucks commonly running Fast 12-speed gearboxes for fuel efficiency and driver comfort.
• DONGFENG Tianlong KL: Heavy freight haulers where the Fast 12JS160T gearbox handles demanding duty cycles.
• FOTON Auman GTL: Modern logistics trucks utilizing Fast Gear transmission assemblies.

In short, if the truck runs a Fast 12JS160T gearbox, this synchronizer assembly is the correct fit. It serves fleets operating in construction, long-haul freight, mining transport, and container haulage where transmission reliability is non-negotiable.

OEM/ODM Capability – Custom Packaging and White-Label Solutions

Mettlead understands that distributors and aftermarket brands need more than just parts—they need parts that carry their identity. That is why we offer flexible OEM and ODM services for the Synchronizer Assembly 12JS160T-1707140 Fast Gear:

• White-Label Packaging: Receive the same quality synchronizer assembly in neutral or your own branded boxes, ready for your distribution network.
• Custom Packaging Design: Our team assists with packaging artwork and labeling to match your brand guidelines, including multilingual labels for diverse export markets.
• Strict Quality Control: Every batch undergoes dimensional inspection, material hardness testing, and surface finish verification before shipment. We maintain full traceability from raw material to finished goods.
• Factory Visit Welcome: We invite buyers to visit our facility in China, inspect production lines, and audit quality processes in person.

Explore our full range of gearbox components and transmission parts to see how Mettlead supports your sourcing needs across multiple truck brands.

Customer Case Study – Synchronizer Assembly 12JS160T-1707140 Bulk Order for East African Fleet

In early 2024, a fleet maintenance company operating over 200 SHACMAN X3000 trucks across Kenya and Tanzania approached Mettlead with an urgent requirement. Their trucks were experiencing hard shifting and gear grinding after 300,000 km of service—a clear sign of synchronizer wear in the Fast 12JS160T gearbox.

They needed 150 units of the Synchronizer Assembly 12JS160T-1707140 with white-label packaging for their in-house parts store. Here is how we delivered:

1. Technical Confirmation: Our engineers verified the exact part cross-reference and confirmed compatibility with their 12JS160T-1707140 spec within 24 hours.
2. Competitive Pricing: Factory-direct pricing saved the client approximately 35% compared to sourcing through intermediary traders.
3. Fast Turnaround: The full order shipped within 12 working days, meeting their maintenance schedule without delays.
4. Post-Installation Feedback: After replacing the worn synchronizers, drivers reported noticeably smoother shifts, and the fleet manager confirmed zero gearbox-related breakdowns over the following four months.

This case demonstrates why procurement managers across Africa, the Middle East, and Southeast Asia trust Mettlead as their go-to source for Fast Gear synchronizer assemblies and other Fast gearbox parts.

Frequently Asked Questions – Synchronizer Assembly 12JS160T-1707140

What does a synchronizer assembly actually do inside a Fast 12JS160T gearbox?

Think of the synchronizer as a speed-matching device. When you move the gear lever, the synchronizer assembly brings the target gear and the output shaft to the same rotational speed before they lock together. Without a functioning synchronizer, you would hear grinding and risk damaging gear teeth every time you shift. The 12JS160T-1707140 assembly handles this job for specific gear positions within the Fast 12-speed transmission.

How do I know my synchronizer assembly needs replacement?

Several symptoms point to a worn synchronizer: difficulty engaging certain gears, a crunching or grinding noise during shifts, the gear lever popping out of position under load, or noticeably increased shift effort. If your truck uses a Fast 12JS160T gearbox and exhibits these symptoms after extended service, the Synchronizer Assembly 12JS160T-1707140 is very likely the component that needs attention.

Is this synchronizer assembly identical to the original Fast Gear OEM part?

Yes. The part is manufactured to match the original 12JS160T-1707140 specifications in every dimension, material grade, and performance parameter. It is a direct drop-in replacement that requires no gearbox modifications.

Can I order just the blocking rings or synchro hub separately?

While we supply the complete assembly as standard, Mettlead can also source individual synchronizer components depending on your repair requirements. Reach out to our team with your specific needs and we will confirm availability.

What is the typical lifespan of this synchronizer assembly?

Under normal operating conditions—proper clutch use, correct transmission oil grade, and no habitual forced shifting—the 12JS160T-1707140 synchronizer assembly typically delivers 250,000 to 400,000 km of service. Harsh driving conditions, overloading, or contaminated gearbox oil can shorten this interval.

Do you offer a warranty on the Synchronizer Assembly 12JS160T-1707140?

Mettlead provides a quality assurance guarantee on all transmission parts. If a defect in material or workmanship is identified within the warranty period, we arrange replacement or credit. Detailed warranty terms are confirmed at the time of order.

Ready to Source Your Synchronizer Assembly 12JS160T-1707140?

Stop letting gearbox problems drain your maintenance budget. The Synchronizer Assembly 12JS160T-1707140 Fast Gear is in stock and ready to ship at factory-direct pricing from Mettlead. Whether you need 10 pieces or 1,000, we deliver the quality, lead time, and flexible payment terms that keep your operations running smoothly.

Get your quote today. Send us your quantity, destination, and any packaging requirements—our team typically responds within 12 hours with a complete offer including shipping options.

Contact us now to request pricing or ask a technical question about the 12JS160T-1707140 synchronizer assembly. Let Mettlead be the transmission parts partner your business can count on.