Content Inside :
This is a Diagnosis and repair of Problematic guide for CHEVROLET/GMC • DODGE • JEEP, Use this definitive 4-wheel drive front axle engagement guide to understand, diagnose, and repair those mysterious 4-wheel drive front axle issues. 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. 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. SLOW ENGAGEMENT OF FRONT AXLE. Owners of Chevrolet/GMC vehicles will comment that the colder the temperature, the longer it takes for the front axle to engage. The front axle actuator is a temperature controlled plunger. It is located on the passenger side (right) axle tube. • Temperatures below 30 degrees Fahrenheit causes engagement to take up to 30 seconds. Per GM Service Bulletin #76-43-01 dated April 1997, engagement of up to 30 seconds is within the design parameters. • Defective TLA. Correction : Replace the TLA with one of the following: • OEM P/N 26013495. Or Install 4×4 Posi-Lok • P/N PSL 600 or PSL 800 (See App. Guide). NO ENGAGEMENT, Cause : If the 4-wheel drive will not engage, one of the following may be the cause: a defective TLA, spline and axle damage, or wiring issues with the transfer switch. Corrections : Check for electrical current to the TLA using a test light. DISENGAGEMENT WHILE IN 4-WHEEL DRIVE. SLOW TO NO ENGAGEMENT. DIFFICULT TRANSFER CASE SHIFT.
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