Shandong Shengyue Technology Development Co.,Ltd is one of the most professional fast 8-speed manual transmission assembly 8js125t-g5777 manufacturers and suppliers in China. Please feel free to buy high quality genuine auto parts at competitive price from our factory.
FAST 8-Speed Manual Transmission Assembly 8JS125T-G5777
Structural Form & Core Technology
| Parameter | Technical Data / Specifications | Features & Significance |
|---|---|---|
| Transmission Model | 8JS125T-G5777 | FAST classic 8-speed manual transmission series for medium-to-heavy trucks and special vehicles. |
| Countershaft Structure | Twin Countershafts | Core power-splitting technology; reduces load on single teeth, offers short axial size and superb shock resistance. |
| Main / Auxiliary Box | Main box with sliding gears + Auxiliary box with planetary mechanism | Classic main-auxiliary combination; ensures high transmission efficiency and wide gear ratio coverage. |
| Synchronizer Type | Full Synchronizer | Double-cone lock-ring style synchronizer in the main box (large load capacity); upgraded high-reliability synchronizer in the aux box. |
| Housing Material | High-Strength Cast Iron / Aluminum Alloy | Depends on customer configuration code G5777. The aluminum housing reduces total weight by approx. 30% compared to cast iron. |
| Gears Profile | Fine-Teeth Meshing Design | Ensures smooth meshing of multiple teeth, increases efficiency, and significantly lowers noise levels under heavy loads. |
Power Input & Load Capacity
| Parameter | Technical Data / Specifications | Features & Significance |
|---|---|---|
| Rated Input Torque | 1250 N·m | Golden power band; primarily paired with 240 HP to 300 HP diesel or natural gas engines. |
| Max Input Speed | 2600 RPM | Matches the rated speeds of mainstream commercial vehicle engines (e.g., Weichai, Yuchai, Cummins). |
| Reliability Design Life | B10 Life reaches 1.2M - 1.5M km | International leading standard for commercial vehicles; meets demands for long-haul and severe working conditions. |
| Oil Capacity | Approx. 7.5 L - 8.0 L | Recommended to use FAST genuine 85W-90 GL-5 heavy-duty gear oil. |
Gear Configuration & Ratio Details
| Gear Name | Reduction Gear Ratio | Recommended Application Scenario |
|---|---|---|
| 1st Gear | 11.255 | Heavy-Load Start / Climbing Gear: Large ratio delivers massive wheel-end torque output. |
| 2nd Gear | 7.883 | Low-speed driving gear for heavy load, muddy roads, or construction jobsites. |
| 3rd Gear | 5.545 | Start-up or low-to-medium load driving gear for urban/city environments. |
| 4th Gear | 3.981 | The highest gear of the main box, preparing to shift into the auxiliary high-range. |
| 5th Gear | 2.827 | Low-speed range gear after switching the high-low range shift. |
| 6th Gear | 1.980 | Common cruising gear for urban roads and suburban areas under standard loads. |
| 7th Gear | 1.393 | Back-up overtaking / climbing gear for highway cruising under standard loads. |
| 8th Gear | 1.000 (Direct Drive) / Overdrive | Main Cruising Gear: Direct drive transmission efficiency is close to 100%, offering the best fuel economy. |
| Reverse 1 | 11.476 | Low-speed reversing gear with high torque and precise control. |
| Reverse 2 | 2.882 | Rapid reversing gear for standard loads or empty vehicle states. |
Physical Dimensions & Logistics Data
| Parameter | Technical Data / Specifications | Features & Significance |
|---|---|---|
| Transmission Length | 821.3 mm | Highly compact layout; optimizes the driveshaft layout of medium trucks or special vehicle chassis. |
| Transmission Net Weight | Approx. 240 kg (excluding gear oil) | Over 30% lighter than traditional single countershaft transmissions with identical torque capacity. |
| Gross Shipping Weight | Approx. 265 kg (including fumigation-free wooden pallet case) | Standard data for truck freight allocation and sea freight shipping calculations. |
| Customs HS Code | 8708409000 | Gearboxes and parts thereof, for motor vehicles (standard classification for international customs import/export). |
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