G.B.L. Government Bill of Lading.

GCW (Gross Combination Weight) Total weight of a loaded combination vehicle, such as a tractor semitrailer or truck and full trailer(s).

Geared Speed Calculated vehicle speed at the engine's governed rpm in each transmission gear, or (commonly) in top gear.

Gear Ratio Number, usually expressed as a decimal fraction, representing how many turns of the input shaft cause exactly one revolution of the output shaft. Applies to transmissions, power takeoffs, power dividers and rear axles. Example: If 2.5 revolutions of an input shaft cause one revolution of the output shaft, the gear ratio is 2.5:1.

Governor A device for regulating a supply of fuel that keeps the same, maximum speed regardless of the load.

Grade Steepness of a grade, expressed as a percentage. Example: A vehicle climbing a 5% grade rises 5 feet for every 100 feet of forward travel.

Gradeability Vehicle's ability to climb a grade at a given speed. Example: A truck with a gradeability of 5% at 60 mph can maintain 60 mph on a grade with a rise of 5%.

GVW (Gross Vehicle Weight) Total weight of a vehicle and everything aboard, including its load.

GVWR (Gross Vehicle Weight Rating) Total weight a vehicle is rated to carry by the manufacturer, including its own weight and the weight of its load.