5 Speed Gear Box Assembly
NORMAL ENGINE SYSTEM
MAIN SHAFT, TRANSMISSION 182mm (11T) : GEAR, MAINSHAFT (15T),GEAR, MAINSHAFT (22T), GEAR, MAINSHAFT (20T),GEAR, MAINSHAFT (18T) , GEAR, FINAL SHAFT (19T).
COUNTERSHAFT, TRANSMISSION 147mm: GEAR (29T), GEAR, COUNTERSHAFT (32T), GEAR, COUNTERSHAFT (25T), GEAR, COUNTERSHAFT (23T), GEAR, COUNTERSHAFT (21T), GEAR, COUNTERSHAFT (28T)
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Product Details of5 Speed Gear Box Assembly
This complete 5 Speed gear box assembly directly replaces the gearbox of a standard vertical engine platform. The assembly includes main and countershaft units, featuring a precision indexing design to ensure accurate gear meshing.
Shaft Dimensions and Tooth Profiles
This kit is defined by its specific shaft lengths and gear ratios
| Main Shaft | Total length 182 mm |
| Fixed Gear | 11 teeth (integrated) |
| Splined Gears | 15, 18, 19, 20, 22 teeth |
| Countershaft | Total length 147 mm |
| Splined Gears | 21, 23, 25, 28, 29, 32 teeth |
Features
Each gear in the 5 Speed gear box assembly is machined from high-carbon alloy steel and undergoes a rigorous heat treatment process. This prevents pitting on the tooth surfaces and shift fork wear-common failure points in low-end gearboxes during frequent shifting. The gear tooth distribution (from 11-tooth main gear to 32-tooth pinion) is balanced against standard engine systems. The gear ratios between 2nd, 3rd, and 4th gears are more closely spaced, reducing the speed drop during upshifts and thus maintaining power under load.
The 182mm main spindle and 147mm counterspindle are ground to micron-level precision. The needle roller bearings and shift forks work together perfectly, eliminating lateral "wobble" that could cause skipping or shifting into neutral.
Wholesale & Logistics
Each 5 Speed gear box assembly is shipped as a pre-assembled unit (main spindle + counterspindle). We use an anti-rust oil coating and vacuum sealing process to prevent oxidation of components during sea freight or long-term storage.
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