Off-Road Terms Glossary

The Limited Slip is basically a preloaded open differential. Also known as a Posi, these units usually use a set of clutch springs to preload the spider gear set between 150-450 ft. lbs. This preload provides a breakaway setting. This breakaway is the f

Most lockers use a type of ratcheting devise to lock the axles together when power is applied to the unit and allow one wheel to disengage while turning. These units are suited for the more aggressive wheeler as these units do have some drivability concerns. Although minor, these units usually clunk and bang but are better suited for the street than a spool. These units will turn both tires even if one is off the ground.

The locking Hub is a device that allows the wheel bearing hub to be disengaged from the axle shaft. This function is used in part time 4 wheel drive vehicles to reduce the additional drag of the drivetrain when the 4 wheel drive is not needed.

Standing for long wheel base, these usually include most normal and full size pickups and SUVs. In LWB SUVs, they usually have 5 doors, but there are also some LWB SUVs with a panelvan type configuration with only 3 doors. These wheelbases are usually around 110 inches or longer.