Glossary “UHSS” Definition:
Ultra High Strength Steel. Can withstand stresses of up to 110,000 psi.
U/D
Glossary “U/D” Definition:
Underdrive
U-bolt
Glossary “U-bolt” Definition:
U-shaped bolts to fit around the rear-axle housing for clamping the leaf spring to the housing.
UB
Glossary “UB” Definition:
Underbody
UART
Glossary “UART” Definition:
Universal Asynchronous Receive and Transmit. Type of data stream used on non-OBD-II diagnostic systems. UART toggles between 5 volts (positive) and 0 volts
u/
Glossary “u/” Definition:
Under
Type II headlamp
Glossary “Type II headlamp” Definition:
Has both low and high beam.
Type I headlamp
Glossary “Type I headlamp” Definition:
Has high beam only.
TXV
Glossary “TXV” Definition:
Thermal Expansion Valve
TWV
Glossary “TWV” Definition:
Two Way Valve
two way catalyst
Glossary “two way catalyst” Definition:
Catalytic converter that oxidizes hydrocarbons and carbon monoxide, but has little effect on oxides of nitrogen.
two valve
Glossary “two valve” Definition:
Two valves. One intake and one exhaust, per cylinder.
two stroke cycle
Glossary “two stroke cycle” Definition:
An engine in which the four events, intake, compression, combustion, and exhaust, take place in two stokes of the piston.
two stage paints
Glossary “two stage paints” Definition:
Consists of two distinct layers of paint: basecoat and clearcoat.
two speed axle assembly
Glossary “two speed axle assembly” Definition:
Heavy-duty, vehicle axle arrangement having two different output ratios from the differential that are controlled from the cab of the truck.
two sided plastic weld
Glossary “two sided plastic weld” Definition:
The strongest type of weld, because you weld both sides of the part.
two plane manifold
Glossary “two plane manifold” Definition:
An intake manifold with two plenums.
two piece valve
Glossary “two piece valve” Definition:
Valve having a head and stem made of two different materials.
two piece piston
Glossary “two piece piston” Definition:
Piston having a removable skirt.
two piece drive shaft
Glossary “two piece drive shaft” Definition:
Type of drive shaft having two sections requiring a center support bearing mounted on the vehicle frame and universal joints at both ends and in the center.