Shandong Shengyue Technology Development Co.,Ltd is one of the most professional fast gear 8-speed manual transmission 8js85e manufacturers and suppliers in China. Please feel free to buy high quality genuine auto parts at competitive price from our factory.
Fast Gear 8-speed manual transmission 8JS85E
Structural & Power Performance Specifications
| Parameter / Item | Technical Specifications & Details | Remarks |
|---|---|---|
| Product Model | 8JS85E | "8" for 8 forward gears; "J" for twin countershaft; "S" for three-shaft; "85" for input torque × 10 (850 N·m); "E" for specific gear ratio series. |
| Max. Input Torque | 850 N·m | Do not exceed this limit to avoid gear damage. |
| Max. Input Speed | 2600 RPM | Matches medium and medium-heavy duty diesel engines. |
| Countershaft Structure | Twin countershaft | Power splitting design offers short axial size and high load capacity. |
| Shifting Type | Manual / Remote dual-rod control | Smooth shifting with excellent engagement feel. |
| Synchronizer Configuration | Full synchronizer | Synchronizers on all gears ensure low shifting effort. |
Gear Ratio Distribution Table
| Gear | Gear Ratio | Operating Characteristics |
|---|---|---|
| 1st Gear | 10.36 | Heavy-load launching and steep hill climbing. |
| 2nd Gear | 7.37 | Low-speed maneuvering. |
| 3rd Gear | 5.31 | Urban traffic or slow-speed driving. |
| 4th Gear | 3.82 | Transition from low to medium speed. |
| 5th Gear | 2.71 | Medium-speed cruising (auxiliary box range shift). |
| 6th Gear | 1.93 | Medium-to-high speed cruising. |
| 7th Gear | 1.39 | High-speed transition gear. |
| 8th Gear | 0.79 | Overdrive gear for fuel-efficient high-speed highway cruising. |
| Reverse 1 (R1) | 10.49 | Low-speed reversing. |
| Reverse 2 (R2) | 2.75 | High-speed reversing. |
Physical & Installation Dimensions
| Dimension & Weight Item | Parameter Value | Remarks |
|---|---|---|
| Net Weight | Approx. 180 kg | Dry weight (excluding gear oil). |
| Total Length | 737.3 mm | From the flywheel housing mating surface to the output flange face. |
| Clutch Housing Interface | SAE 1# or SAE 2# | Varies depending on vehicle application/matching. |
| Input Shaft (1st Shaft) Spec | Standard splined shaft | Matches the corresponding clutch driven disc size. |
| Power Take-Off (PTO) Openings | Bottom, side, and rear standard windows | Commonly paired with Fast Gear genuine QD40A PTOs. |
Maintenance & Lubrication Requirements
| Maintenance Item | Official Technical Standard |
|---|---|
| Recommended Lubricant | 85W-90 or 80W-90 Heavy Duty Vehicle Gear Oil (API GL-5 level) |
| Oil Capacity | 6.0 Liters (L) |
| First Oil Change Interval | After initial 2,000 to 5,000 km (Mandatory break-in service) |
| Routine Oil Change Interval | Every 20,000 to 30,000 km (or equivalent operating hours) |
| Max. Operating Temperature | Must not exceed 120 °C |
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