Auxiliary Gearbox Synchronizer Assembly

Description：High-performance auxiliary synchronizer assembly for heavy truck transmissions. Ensures smooth shifting between high and low ranges. Compatible with FAST, HW19710, EATON, and ZF gearboxes. Durable, precise, and OEM-ready.

Product model：

Category ：Transmission System

Update time：2025-07-03

Product Overview

Auxiliary synchronizer assembly is a core transmission component installed in the auxiliary section of a heavy-duty truck gearbox. It is responsible for matching gear speeds during shifting operations, enabling smooth engagement of low and high-speed ranges without grinding or delay. This enhances overall transmission efficiency, driving comfort, and vehicle durability.

Our synchronizer assemblies are precisely engineered using high-strength materials and advanced manufacturing techniques. Compatible with major transmission systems such as FAST 12JSD, HW19710, EATON, and ZF, they are ideal for SINOTRUK HOWO, SHACMAN, FAW, and Dongfeng trucks.

Key Features

Precision-machined synchronizer ring with high wear resistance
Efficient cone clutch engagement for quick speed matching
Anti-friction treatment for reduced heat and wear during shifting
Supports OEM replacement for FAST, EATON, and ZF transmissions
Improved shifting smoothness and extended transmission lifespan
Fully tested for gear engagement performance and durability

Technical Specifications

Parameter	Specification
Component Type	Synchronizer Assembly (auxiliary gearbox section)
Material	High-strength alloy steel + friction composite materials
Cone Type	Single or double-cone (depending on gearbox model)
Compatible Transmissions	FAST 12JSD180/200, HW19710, EATON Fuller, ZF 16S, etc.
Gear Range	Low/High split (auxiliary gear shift)
Surface Finish	Polished + heat-treated surfaces
Durability	> 300,000 shift cycles (lab tested)
Application Vehicles	HOWO, SHACMAN, FAW, Dongfeng, FOTON heavy-duty trucks