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SINOTRUK LIGHT TRUCK WLY 6-speed manual transmission
First and second gear synchronizer assembly 6TS40-3160
Third and fourth gear synchronizer assembly 6TS40-3360A1
Five and six-speed synchronizer assembly 6TS40-3560A1
Reverse gear synchronizer assembly 6T100-3864/3863
Internal Disassembly Components
1. synchronizer sleeve (the externally toothed sleeve engaged by the shift sliders).
2. gear synchronizer hub (the core component supporting the sleeve and sliders).
3. Synchronizer slider/thrust piece (set of 3; responsible for providing mechanical resistance/detent feel during gear engagement).
WLY Core Transmission Components Technical Integration Parameters
| Original Part No. | Standard Part Name | Gear / Axial Position | Matching Transmission Platform | Core Wearable Component Breakdown | Core Replacement Scenarios & Symptoms |
|---|---|---|---|---|---|
| 6TS40-3160 | 1st & 2nd Gear Synchronizer Assembly | Forward Gears: 1st & 2nd Gear (Installed on the front section of the Output Shaft / Main Shaft) |
WLY 6TS40 / 6G40 Series (Aluminum housing, 6-speed manual transmissions for light-duty trucks) |
Includes: • Synchronizer Sleeve: 5TS40-3164A1 • Synchronizer Hub: 6TS40-3163 • Synchronizer Struts / Sliders: 5TS40-3165 (3 pcs) |
Severe gear clashing or stiffness when shifting into 1st/2nd gear during heavy-load startup or uphill climbing; or frequent gear jumping (popping out of gear) under hard acceleration. |
| 6TS40-3360A1 | 3rd & 4th Gear Synchronizer Assembly | Forward Gears: 3rd & 4th Gear (Installed on the mid section of the Output Shaft / Main Shaft) |
WLY 6TS40 / 6G40 Series (Aluminum housing, 6-speed manual transmissions for light-duty trucks) |
Features a two-way symmetrical structure, sandwiched directly between the 3rd and 4th gear engagement gear rings to synchronize the mid-speed "golden gears". | Synchronizer rings worn out due to high-frequency urban logistics shifting. Symptoms include difficulty shifting into 3rd/4th gear or the shift lever automatically popping back to neutral during acceleration. |
| 6T100-3864 | Reverse Gear Synchronizer Sleeve (Commonly called: Reverse Slider / Reverse Sleeve) |
Reverse Gear: R Gear Position (Installed on the rear end of the Output Shaft in the reverse gear zone) |
WLY 6T100 / 6TS100 Series (Heavy-duty, high-torque 6-speed transmissions) |
Acts as a mating "male and female" pair with the 3863 hub. It slides back and forth via the shift fork to lock the reverse driven gear. | Blindly shifting into reverse before the vehicle comes to a complete stop causes engagement teeth wear. Symptoms include violent gear jumping (popping back to neutral) as soon as the throttle is pressed while reversing. |
| 6T100-3863 | Reverse Gear Synchronizer Hub (Commonly called: Reverse Gear Base / Spline Hub) |
Reverse Gear: R Gear Position (Press-fitted onto the splines at the rear end of the Output Shaft) |
WLY 6T100 / 6TS100 Series (Heavy-duty, high-torque 6-speed transmissions) |
Features high-strength internal splines that mesh tightly with the Output Shaft, serving as the core sliding base for the reverse gear sleeve. | Poor lubrication or lack of gear oil leads to galling, scoring, or deformation of the spline grooves. Symptoms include the reverse gear being completely impossible to engage or getting stuck and unable to disengage. |
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