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Shift-bar Housing

A component that houses shift rails, shift yokes, detent balls and springs, interlock balls, and pin and neutral shaft; available in standard- and forward-position configurations.

Shifter

A floor- or steering column-mounted lever on a motor vehicle used to select and/or shift the transmission gears.

Shifting Forks

A term used for shift forks. Also known as shift yoke.

Shifting Rods

The linkage of a manual transmission that connects the shifter to the shift forks.

Shillelagh

A hot Chevrolet V-8 engine.

Shim

1. A thin metal spacer used to align the clearance of a part. 2. A slotted strip of metal used to adjust the front-end alignment on many vehicles.

Shim Stock

Thin metal, usually in a roll, that can be easily cut to be used as a shim.

Shimmy

A harsh, side-to-side vibration of the steering wheel usually due to front wheel imbalance.

SHO

Super high output.

Shock

A term used for shock absorber.

Shock Absorber

A hydraulic device used at each wheel of the suspension system to help control the up, down, and rolling motion of a car body by dampening the oscillations or jounce of the springs when the car goes over bumps, thereby contributing to vehicle safety and passenger comfort. Also referred to as shock.

Shock Compression

The shock absorber in its shortened position, which occurs when the wheel moves upward.

Shock Fluid

Specially formulated hydraulic fluid used inside of shock absorbers.

Shock Foaming

The mixing of air and shock fluid, due to rapid movement of fluid between the chambers, causing the shock absorber to develop a lag because of piston is moving through an air pocket that offers up resistance. A gas-filled shock absorber is designed to reduce oil foaming.

Shock Hydraulic Principles

Fluid is forced through orifices and/or valves at a controlled rate to provide the desired dampening effect.

Shock Mounting Position

The direction and/or angle at which a shock absorber is mounted.

Shock Mounts

The rubber isolating bushing or grommets attached to the upper shock-mounting piston rod and the lower mounting cylinder tube in which the piston operates.

Shock Operational Check

A method used to check shock efficiency that includes bouncing the vehicle bumper vigorously and observing the shock dampening action, or pumping the brakes slowly at low speed to see if the vehicle "rocking" motion is set up.

Shock Piston

The component attached tot he bottom of the piston rod containing the rebound valve that moves back and forth inside the inner cylinder.

Shock Rebound

The rebound travel when the shock absorber is in its lengthened position, which occurs when the suspension or spring moves downward.