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4x4 Posi-Lok Advantages
PSL900 for Jeep Shown Above
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OEM Vacuum Actuator Disadvantages
Jeep, Dodge and S-Series
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OEM Thermal Linear Actuator Disadvantages
Chevy/GMC K-Series
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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.
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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.
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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.
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.
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