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I have a 1999 tahoe with a strange (to me) 4×4 issue. With the truck stationary in neutral and the brake pressed, the 4×4 system will shift perfectly from 2hi, 4hi, 4lo and 4auto and back. When I drive for a bit in any setting other than 2hi the service 4×4 light comes on and will not let me shift out of 4wd until I come to a stop, shut it off and restart. I suspect there is a speed sensor someplace that is acting up, but maybe something else?
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