Use this definitive 4-wheel drive front axle engagement guide to understand, diagnose, and repair those mysterious 4-wheel drive front axle issues. This guide explains how the OEM units function, what causes them to fail, and which corrections are available. WHAT IS 4X4 POSI-LOK? 4×4 Posi-Lok is the patented cable activated engagement device designed to replace the failure prone vacuum and electric front axle engagement systems. 4×4 Posi-Lok is not a posi-trac or locker. 4×4 Posi-Lok is simple and easy to install and allows you to engage your front axle from inside the cab. Posi-Lok guarantees that your 4-wheel drive will engage every time because you are in direct control of front axle engagement. A one inch pull of the 4×4 Posi-Lok cable ensures you will have 4-wheel drive when you need it, as long as the transfer case is engaged.
POSI-LOK BENEFITS
• 4×4 Posi-Lok provides 2-wheel drive low range, giving the vehicle 4-LO torque at the rear axles with bind free steering only available in 2-HI. This feature is not available with factory systems and is beneficial when maneuvering trailers.
• 4×4 Posi-Lok reduces front differential wear and right axle breakage.
• 4×4 Posi-Lok will not disengage when the ignition is turned off or the differential is submerged.
• 4×4 Posi-Lok is compatible with manual or electric transfer cases and complete installation can be completed in one to two hours with basic hand tools. No internal differential work required.
HOW 4X4 POSI-LOK BEGAN
4×4 Posi-Lok [Patent No. 5,605,213] was invented by Dick White in the early 1990’s. Prompted by multiple failures on his own late model Chevy 4-wheel drive, White realized that the TLA (Thermal Linear Actuator) wasn’t engaging the right front wheel even when the transfer case was in 4-LO and the 4-wheel drive dash light was on. After careful study and design, White invented a cable operated actuator to replace the failing TLA. The new system functioned flawlessly, and provided a benefit that the factory design could never provide: 2-wheel drive low range. White went on to develop a Posi-Lok system for the vacuum actuated Chevrolet/GMC T-10/15 Sonoma Pickup, Blazer and Jimmy, Dodge Ram Pickup and Jeep Wrangler YJ, Cherokee XJ and Comanche MJ.

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