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2 Step

A 2 step is a form of launch control. Also known as a stutterbox, it acts as a secondary rev limiter.

A 2 step relies on the speed sensor to determine whether or not the vehicle is moving. If the vehicle isn’t moving and the clutch is depressed, the motor will rev at a lower value.

System

Electrical System

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2 Way Radio Mount 

Vehicle 2-way radios allow people to stay in touch with others even when there’s no phone signal. This can be very useful for employees of a taxi or limousine service or those who live in an area where the phone signal is spotty. 2-way radios are boxes that are shaped like compact DVD players, and they’re typically installed on the vehicle’s dashboard for easy access. 2 way radio mounts allow the radios to be securely mounted onto a vehicle using metal hardware, nuts, screws, and bolts. 2-way radio mounts come in a variety of shapes and sizes, depending on the radio’s intended location. 

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4WD Actuator

A four-wheel drive (4WD) actuator is a component that engages the gear ranges in a 4WD system.

A 4WD vehicle has two differentials: one for the front wheels and another for the rear wheels. It also has a transfer case that directs engine torque to the front and rear axle assemblies.

A 4WD transfer case uses transmission output as an input to a secondary gear train. The transfer case will only deliver torque via a gear-to-gear or gear-to-chain transfer, which can be accomplished by an actuator or manual lever.

System

Transmission System

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4WD Actuator Cable

The 4WD actuator cable is a part that connects the four-wheel drive (4WD) actuator to the front differential, allowing you to engage and disengage 4WD mode in your vehicle. This part might be required when you install a new front axle actuator. The 4WD actuator cable lies between the 4WD actuator and the front differential in the front. The 4WD system relies on the 4WD actuator cable to maintain 4WD functionality.

System

Transmission

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4WD Actuator Valve

A 4WD actuator valve opens or closes, depending on the input from the 4WD actuator. Generally, a valve is designed to regulate fluid flow and obstruct various passageways when necessary.

System

Transmission

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4WD Hub Locking Solenoid

The 4WD hub locking solenoid disengages the front wheels when the vehicle isn’t using the four-wheel drive function. By switching to a two-wheel drive setup, the vehicle consumes less fuel.

System

Transmission

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4WD Indicator Lamp Switch

The 4WD indicator lamp switch activates and deactivates the light that indicates whether or not 4WD, which stands for “Four-Wheel Drive”, is engaged.

Because many modern vehicles with built-in 4WD can activate the system on their own, the 4WD indicator lamp switch is a vital component that helps drivers know when it’s in use. Typically, 4WD activates when driving on slippery surfaces where more traction is crucial.

System

Electrical System

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4WD Indicator Light Switch

The 4WD Indicator Light Switch controls the four-wheel drive light, which illuminates when four-wheel drive is activated. The switch controls the current to the 4WD activator. It is usually located on top of the transfer case, on the driver’s side near the shift linkage.

System

Drivetrain

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4WD Switch

The 4WD Switch is the part of the vehicle that engages or disengages four-wheel drive. Four-wheel drive is activated by the driver by pushing a button or pulling a lever. Doing so toggles the 4WD switch, allocating power to all four wheels of the vehicle instead of just two. This helps the vehicle retain traction on slippery or uneven surfaces. You can typically find the 4WD switch on your vehicle’s dashboard.

System

Drivetrain

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5 Lug Conversion Kit

A 5 lug conversion kit is a set of parts that are designed to replace your vehicle’s 4-lug hub with a 5-lug hub. Converting a vehicle to a 5-lug hub will allow it to fit wheels that have 5 lugs, which can expand the owner’s possibilities when it comes to choosing the wheel style that they want. Wheels that have a 5-hub design tend to be more common, giving a vehicle owner more wheel choices. 5-hub designs also allow a vehicle to have more upgrades like better brakes.

System

Drivetrain

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5th Wheel Base Rail

The 5th wheel base rail is an accessory that provides mounting points for a 5th wheel hitch on your truck bed. This part might be required if your truck needs a 5th wheel hitch for towing heavy-duty loads like flatbed trailers, large travel trailers, and RV campers. 5th wheel base rails are installed on the cargo bed of your truck and bolt onto brackets for specific fits. 5th wheel hitches need the base rails as mounting points on the truck bed.

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Accessories

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5th Wheel Hitch

The 5th Wheel Hitch is a large, horseshoe-shaped hitch for towing fifth-wheel trailers. It allows the driver to tow loads that are much heavier, such as washing machines and full-sized kitchens, than traditional tow bar hitch setups. 5th wheel hitches are directly attached to the truck’s frame, which means the center of the hitch plate is near or directly over the truck’s rear axle. This ensures the weight of the trailer is better supported while preventing trailer sway.

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Accessories

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5th Wheel Hitch Head

The 5th Wheel Hitch Head is a part of the 5th wheel hitch, which is a large, horseshoe-shaped hitch used for towing fifth-wheel trailers. The head provides an immediate connection point for the trailer kingpin, as it’s connected to the hitch or skid plate, jaws, handle, and pivoting mechanism. When towing a trailer or heavy cargo, the 5th wheel hitch head promotes a smooth ride by moving with the trailer.

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Accessories

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5th Wheel Leg

A 5th Wheel Leg usually comes as part of a set. These heavy-duty legs are designed to affix a 5th wheel hitch head to a truck bed. They can often hold up to 30,000 pounds of weight to accommodate the average 5th wheel trailer. Some models offer quick-install anchors that can be adjusted to reduce chucking. These 5th wheel legs are typically protected by rust-resistant coatings to protect them from the elements.

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Accessories

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About The Author
Written By Automotive and Tech Writers

The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by CarParts.com's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

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