4x4 Posi-Lok replaces the vacuum actuator with a cable operated actuator that puts the driver in control of the engagement from inside the cab. After engaging the transfer case, a one inch pull of the 4x4 Posi-Lok cable connects the right front axle to the intermediate shaft using the shift collar and fork, and 4-wheel drive is engaged! Simply reverse the procedure to disengage 4-wheel drive. 4x4 Posi-Lok also works great with lockers! When the front axle is locked, you can disengage the passenger side in order to make turns without wheel hop.
Common Problems With The OEM System-Vacuum Actuator

The colder the temperature, the longer it will take to engage.

If the front differential becomes submerged, the TLA temperature will cool and the 4-wheel drive will disengage.

The TLA unit can cause excessive wear on internal components in the differential and may cause other electrical problems.
4x4 Posi-Lok Benefits

4x4 Posi-Lok reduces front differential wear and right axle breakage.
4x4 Posi-Lok provides 2-wheel drive low range, giving the vehicle 4-LO torque at the rear axle with bind free steering only available in 2-HI. This feature is not available with factory systems and is beneficial when maneuvering trailers.
4x4 Posi-Lok will not disengage when ignition is turned off or the differential is submerged.
4x4 Posi-Lok is compatible with manual or electric transfer cases and installation can be completed in one to two hours with basic hand tools. No internal differential work is required.
Part No. 400 Includes:

New cast aluminum housing for the central axle disconnect system
Heavy-duty cable
Easy to follow instructions
Complete wiring system to ensure the 4WD dash indicator light functions properly


(Sold Separatley) Part No. 1100: Perm-Lok

The Perm-Lok permanently engages the Central Axle Disconnect (CAD) system and couples both front axles permanently. Once installed, the front axles will not pull until the transfer case in engaged.

(Sold Separatley) Part No. 100: Cast Iron Fork

Heavy-duty, cast iron fork with pads
Replaces your old worn out fork and pads on Dodge applications