My son just purchased a '91 *-10 Blazer Tahoe 4x4 with I believe 247K on it (if that'* true). We just got a bunch of sleet and ice here in Arkansas and my son found out today that he does not have 4x4 high or low. I am not familiar with 4 wheel drives and was wondering if someone could give me a starting point on where and what to look for. When he tries to put it in 4 low, the shifter pops out of positon like it may be a linkage issue. Thanks.
The front diff is usually the issue with no 4wd. There is a cable that runs from the front diff to a vacuum actuator. Usually the cable is bad or the vacuum actuator is broken or not getting vacuum from the vacuum switch.
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