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PSL900 for Jeeps shown

Works like hubs with full control from inside the cab without stopping and reduces front differential wear and right axle breakage.

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.

Will not disengage when ignition is turned off or the differential is submerged.

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.

OEM Vacuum Actuator Disadvantages (Jeep, Dodge, S-Series)

The OEM unit is vacuum controlled. This vacuum system is prone to failure due to frozen diaphram, loss of vacuum, hard or cracked vacuum hoses, or complete loss of vacuum lines.

The OEM unit has demonstrated a high rate of failure, is non-repairable and may cause other problems.

The OEM unit can cause excessive wear on the differential and/or right axle and shift fork breakage due to incomplete engagement or disengagement.

OEM Thermal Linear Actuator Disadvantages (Chevy/GMC K-Series)

A temperature activated plunger (Thermal Linear Actuator-TLA) connects power from the left front axle to the right front axle after the transfer case is engaged.

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.

Applications

OEM System: Thermal Linear Actuator
On the OEM (Original Equipment Manufacturer) system, once the transfer case is engaged, the left front axle begins to turn, and the thermal linear actuator is engaged. Thermal Linear actuators create an electrical current that heats the plunger. The left axle and intermediate shaft are connected by spider gears in the differential, and the thermal linear actuator, once heated enough, extends approximately one inch to slide the shift collar and fork over the intermediate shaft to connect it to the right front axle. Both front axles are now turning and 4-wheel drive is fully engaged. When the OEM actuator fails, the shift collar and fork can't connect the right front axle to the intermediate shaft, so the 4-wheel drive never engages.

4x4 Posi-Lok replaces the thermal linear 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 slides the shift fork and collar to connect the right front axle to the intermediate shaft and 4-wheel drive is engaged! Simply reverse the procedure to disenage 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.

The TLA is electronically controlled and may disengage when the engine is turned off.

The TLA unit can cause excessive wear on internal components in the differential and may cause other electrical problems.

System Disengaged Lever slides the shift System Engaged

collar and fork

PSL1000

1988 - 1998 Chevy/GMC 1500 & 2500 with 6 Lug

1992 - 1998 Chevy/GMC Suburban, Tahoe, Yukon with 6 Lug

1988 - 1998 Chevy/GMC 2500 & 3500 with 8 Lug

1992 - 1998 Chevy/GMC Suburban with 8 Lug

The Perm-Lok permanently engages the Central Axle Disconnect (CAD) system and couples both front axles. Once installed, the front axles will not pull until the transfer case is engaged. This application is ideal for fleet operators or emergency vehicles. Installation is easy and con be completed in approximately 10 minutes.

PSL600

1998 - 1998 Chevy/GMC 1500 & 2500 with 6 Lug

1992 - 1998 Chevy/GMC Suburban, Tahoe, Yukon with 6 Lug

With Thermal Linear Actuator (TLA)

PSL800

1988 - 1998 Chevy/GMC 2500 & 3500 with 8 Lug

1992 - 1998 Chevy/GMC Suburban with 8 Lug

With Thermal Linear Actuator (TLA)

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OEM System: Vacuum Actuator
On the OEM (Original Equipment Manufacturer) system, once the transfer case is engaged, the front driveshaft begins driving the left front and intermediate axle shafts, which are coupled in the differential by the spider gears. The vacuum actuator slowly pulls the shift collar using the fork to connect the free-wheeling right front axle shaft to the driven intermediate shaft. Both front axles are now turning and 4-wheel drive is fully engaged. When the OEM actuator fails, the the fork is unable to move the shift collar to connect the right front axle to the intermediate shaft, and the 4-wheel drive never engages.

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 disenage 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.

PSL400

1994 - 2001 Dodge Ram 1500 - 3500 with Dana 44 - Dana 60

Note: With Central Axle Disconnect (CAD)

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PSL900

1987 - 1995 Jeep Wrangler YJ

1984 - 1992 Jeep Cherokee XJ

1986 - 1991 Jeep Comanche MJ

Note: With Dana 30 Axle (CAD)

PSL920

Same applications as the PSL 900 - but 18" longer for lifted applications

Other applications available. Call us at 303-367-966 for more information