-A non-synchronous transmission is a form of transmission based on gears that do not use synchronizing mechanisms.
-found primarily in various types of agricultural, and commercial vehicles.
-Engineered to pull tremendous loads, often equal to or exceeding 40 tons
-Non-synchronous transmissions are engineered[4]with the understanding that a trained operator will be shifting gears in a known coordination of timing.
-Commercial vehicle operators use a double-clutching technique that is taught in driver's trade schools.
-The most skillful drivers can shift these transmissions without using the clutch by bringing the engine to exactly the right rpm in neutral before attempting to complete a shift, a technique called "float-shifting."
-some heavy haulers have over 24 gears that an operator will shift through before reaching a top cruising speed of 70 mph (113 km/h).
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