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I think its servo. Gas charged, electrically heated expands gas? Could that servo just not be pulling all the way back out when not engaged? thats kind of what I was thinking after posting this message.

I have a 99 Tahoe that started making a grinding noise when I start accelerating while in 2H. It is not coming from the transmission and sounds like it is in the 4WD transfer case. I can put the truck in 4Lo and 4Hi (although the 4 HI light doesn't actually come on but feels like its in 4H). In...