a knob showing driver position of each gear.
a knob, variously called gear knob, shift knob, gear shift knob or stick shift knob, forms handle gear stick. typically gear knob includes diagram of shift pattern of gear selection system, i.e. positions gear stick should moved when selecting gear. in older manual transmission vehicles, knob may incorporate switch engage overdrive; in automatic transmission vehicles may incorporate switch engage special mode such sports mode or disengage overdrive. both of above-mentioned switches may found on console or on steering column stalks instead. manual shifters on steering column, if having 3 forward speeds, typically called 3 on tree . lowest of these gears, if set @ lower ratio typical 1st-gear ratio, called granny gear .
starting car in gear clutch engaged causes lurch forwards or backwards, since starter motor produces sufficient torque move whole vehicle; can highly dangerous, if parking brake not firmly applied , can injurious starter , drivetrain. therefore, novice drivers taught rock knob of manual gearbox side side before starting engine confirm gearbox in neutral. same reason, modern cars require clutch pedal depressed before starter engage. latter practice useful in extremely cold conditions or weak battery, avoids starter motor having turn on gearbox full of cold , highly viscous oil.
many automatic transmission vehicles have controls on gear stick, or close by, modify choices made transmission system depending on engine , road speed, e.g. sports or economy modes broadly speaking allow, respectively, higher , lower revolutions per minute, before shifting up.
some specialist vehicles have controls other functions on gear stick. land rover freelander introduced button company s hill descent control system feature, uses brakes simulate function of low-ratio gearbox in steep descents.
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