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Intermittent 4wd problem


Burchie70

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New to the forum and would appreciate any help offered. I have a 1990 Chevy K3500 4wd 7.4L truck I use for plowing. I've used it for 2 years and started having problems toward the end of last winter. I changed the passenger side front axle because of a tear in the boot the 1st winter. The problem is that the 4wd doesn't always work. I changed the actuator and checked the voltage at the plug which was 12 volts. When the 4wd stops working the drivers side front tire and passenger side rear tire spin but that is it. I would say it works 50% of the time when I'm plowing. Anyone have an idea of where to start ? Thanks Steve

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