Understanding the Gear Knob
Function:
The gear knob is the handle attached to the gear shift lever, allowing the operator to manually select gears in the transmission or gearbox. It provides a comfortable grip and clear tactile feedback for shifting.
In a mechanical buffalo, the transmission is typically a simple manual gearbox (e.g., 2–4 forward gears, 1 reverse, or a single-speed with forward/reverse) that transfers power from the engine (via the Bando A19 belt) to the axle housing and drive shafts.
 
Mechanical Buffalo Context:
Mechanical buffalos, used for plowing or agricultural tasks in regions like Southeast Asia, often have basic, rugged transmissions with a single lever for gear selection. The gear knob is mounted on this lever, which connects to the gearbox (likely the axle housing gearbox you mentioned) to engage gears or a clutch mechanism.
The knob may control a transaxle (combined transmission and differential) or a separate gearbox linked to the axle housing, driving the left and right drive shafts to the wheels.
 
Specifications:
Material: Typically plastic, rubber, or metal (e.g., bakelite, aluminum, or hard plastic) for durability and grip in muddy or humid conditions.
Size/Shape: Round, cylindrical, or ergonomic, often 1.5–2.5 inches (38–63 mm) in diameter, with a threaded or push-on fitting to attach to the gear lever.
Mounting: Attaches to the gear lever via a threaded insert (e.g., M8, M10, or M12 threads, common in small vehicles) or a set screw/push-on design. Some knobs have a shift pattern (e.g., H-pattern or forward/reverse) printed or engraved.
Gearbox Linkage: The lever connects to the gearbox (e.g., within the axle housing) via a linkage or cable, engaging gears like spur or bevel gears in the differential or transaxle.