🔩 Gear Coupling – Leyland L/L 350 / 370 Tusker (Serrated / Round)
📌 What It Is
The gear coupling (also called gear box coupling flange) is a mechanical torque‑transmitting flange used in heavy truck drivetrains. It connects the gearbox output to the propeller/driveshaft yoke via a serrated (toothed) round face, allowing secure engagement and efficient power transmission with minimal slip under load. This flange is commonly used in Leyland L/L 350 and L/L 370 Tusker series trucks.
⚙️ Key Characteristics
Application: Leyland L/L 350 / L/L 370 Tusker truck driveline.
Part Type: Gear Coupling / Gear Box Flange (serrated, round) for mounting between gearbox output and propeller shaft yoke.
Plate Size (Approx): ~146 mm (about 6″) plate diameter.
Height / Thickness: ~12.80 mm plate thickness.
Bolt Pattern: Typically 4 bolts, with a serrated torque face for positive engagement.
Spline / Profile: Gear teeth (serrated) type — designed for heavy torque and vibration resistance.
📌 Round vs Square:
There are both square and round versions shown in parts listings, but for gear coupling driving torque from the gearbox output, the round serrated flange is the standard choice for the Tusker series.
🔩 Function in the Vehicle
✔ Torque Transmission: Transfers rotational power from the transmission output shaft to the propeller shaft reliably.
✔ Positive Engagement: The serrated surface increases grip and reduces slip compared with smooth flanges.
✔ Heavy‑Duty Design: Built for commercial truck engines and gearboxes, capable of handling high torque conditions during loading, uphill, or off‑road.