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Re: 89 Sierra 4x4 inoperable
The front axle actuator is known to be a problem in these models. Have you noticed a long delay in engagement before this?
There is a new part to solve this problem, check with a GM dealer. It requires a new wire harness also. The original actuator needs to heat up a gas to make the plunger move to engage the front axle. Over time its just get weak and can not longer move it. The new one is electical and is instantaneous.
Check into that, its a well known problem from 88 to circa 1996.
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Mike
2010 GMC Sierra SLT E. Cab Z71 All Terrain
2009 Cadillac CTS4 3.6L AWD Performance Sedan
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