Question about 1989 Chevrolet C/K 3500

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4 wd does not engage when selected, & 4 wd shift does not light. What should I do first to find out what the problem is?

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The modulator at the transfer case probably stuck and may need service or replacement. Use a rubber mallet and hit actuator where it bolts to case careful don't hit the connector. If it moves than remove and lube the actuator shaft. If it don't move, than remove and check shaft for bent or damage. Try to shift to four high. If actuator activates and shaft does not move most likely replace, but have part checked by auto store first.

Posted on Nov 15, 2010

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I had a very similar problem with my 98 gmc 2500. The 4 low would engage - though the upshifts were erratic, but no 4 high though the light sometimes came on. I changed out the electric shift solenoid or whatever it is called, on the transfer case and it worked fine after that. A fairly simple fix that can be done in 15 minutes. Hope this helps.

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