F 350 2WD Super Duty V10-6.8L VIN S (1999)
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Clonk
A hydraulic knocking sound. Sound occurs with air pockets in a hydraulic system. Also described as hammering.
Clunk/Driveline Clunk
A heavy or dull, short-duration, low-frequency sound.
Occurs mostly on a vehicle that is accelerating or decelerating abruptly. Also described as a thunk.
Coast/Deceleration
Releasing the accelerator pedal at cruise, allowing the engine to reduce vehicle speed without applying the brakes.
Coast/Neutral Coast
Placing the transmission range selector in NEUTRAL (N) or depressing the clutch pedal while at cruise.
Constant Velocity (CV) Joint
A joint used to absorb vibrations caused by driving power being transmitted at an angle.
Controlled Rear Suspension Height
The height at which a designated vehicle element must be when driveline angle measurements are made.
Coupling Shaft
The shaft between the transfer case and the front drive axle or, in a two-piece rear driveshaft, the front section.
CPS
Cycles per second. Same as hertz (Hz).
Cracks
A mid-frequency sound, related to squeak. Sound varies with temperature conditions.
Creak
A metallic squeak.
Cruise
Constant speed on level ground; neither accelerating nor decelerating.
Cycle
The process of a vibrating component going through a complete range of motion and returning to the starting point.
Decibel
A unit of measurement, referring to sound pressure level, abbreviated dB.
Drive Engine Run-Up (DERU) Test
The operation of the engine through the normal rpm range with the vehicle standing still, the brakes applied and the transmission engaged. This test is
used for noise and vibration checks.
Driveline Angles
The differences of alignment between the transmission output shaft, the drive shaft, and the rear axle pinion centerline.
Driveshaft
The shaft that transmits power to the rear axle input shaft (pinion shaft). In a two-piece driveshaft, it is the rearmost shaft.
Drivetrain
All power transmitting components from the engine to the wheels; includes the clutch or torque converter, the transmission, the transfer case, the
driveshaft, and the front or rear drive axle.
Drivetrain Damper
A weight attached to the engine, the transmission, the transfer case, or the axle. It is tuned by weight and placement to absorb vibration.
Drone
A low frequency (100-200 Hz) steady sound, like a freezer compressor. Also described as a moan.
Drumming
A cycling, low-frequency (20-100 Hz), rhythmic noise often accompanied by a sensation of pressure on the eardrums. Also described as a low rumble,
boom, or rolling thunder.
Dynamic Balance