Hey guys, Transfer case went out on a 1999 GMC Sierra 5.3L V8 4x4. I bought and installed used 246 GM transfer case matching the broken one on craigslist. It will start in either park or drive but when put into reverse, drive or 3, 2, 1 it doesn't move. The rpms drop slightly when I move it from neutral to a drive gear such as reverse and drive. Changed out all three speed sensors from old transfer case and nothing still.
JeremyJohns31
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