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Drift Oil Passage

Holes drilled in various parts of the engine for pressurized oil to flow through.

Drift Pin

A round, tapered, steel pin used to bring plates that are to be bolted or riveted into alignment to permit placing bolts or rivets easily.

Drip Pan

A shallow pan under the evaporator core to catch the condensation that will be ejected by a drain hose fastened to the drip pan and extending to the outside.

Drive Axle

An axle or axle shaft that transmits power to the drive wheels.

Drive Belt

Flexible belt or belts used to connect a drive pulley on the crankshaft to the coolant pump and accessories. Two basic types of drive belts are the serpentine or multiple-ribbed belt and V-belt.

Drive By Wire

To use an electronic throttle control rather than mechanical linkage.

Drive Coil

A hollow field coil in a positive engaged starter that is used to attract the movable pole shoe.

Drive Cycle

The purpose of the OBDII drive cycle is to assure that all of the on-board diagnostic tests (monitors) have been run on the vehicle so that all of the I/M flags are set.

Drive Fit

A term used for interface fit.

Drive Gear

In a combination of two operating gears, the first is the drive gear and the other is the driven gear.

Drive Line

Assembly of various parts such as the drive shaft, universal joints, and connecting yokes that transmit torque from the transmission to the differential.

Drive Shaft

An assembly of one or two universal joints connected to a shaft or tube used to transmit power from the transmission to the differential.

Drive Shaft

See driveshaft.

Drive Train

All of the components required to deliver engine power to the road surface.

Drive Train

See drivetrain.

Drive Wheels

The wheels that receive power to move a vehicle. In a front-wheel-drive vehicle, this would be the front wheels. Obviously, in a rear-wheel-drive vehicle, it would be the rear wheels. All-wheel-drive vehicles send power to all four wheels all the time. And 4-wheel-drive vehicles send power to the rear wheels, except when 4-wheel-drive is engaged.

Drive-line Torque

The transfer of torque between the transmission and the driving axle assembly.

Driveability

The general operation of a vehicle, rated from good to poor, based on the characteristics of the average driver.

Driveline

See drivetrain.

Driveline Windup

A reaction that takes place as a result of the transfer of engine torque through the rear-wheel driveline.