my 98 ford ranger keeps going in n out of 4 wheel drive n the 4 high n 4 low light flash when im driving i need to know how to fix the problem out put shaft n bearing went bad on the passengers side if anyone know any thing please get back to me at vangeldervincent@yahoo.com
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I have the same exact truck and mine used to do the same exact thing. The switch is most likely bad. I havent got the switch for mine yet so whenever i need 4 wheel drive i have to crawl under my truck and turn the transfer case manually.
If it keeps going in/out of 4x4 I'd check to see if your vacuum lines are bad. Sounds like the culprit to me.