1995 GMC Sub 4X4 2H prob

Here's the problem, when accelerating from a stop a grind from the 4wheel drive transfer case while in 2H. The grind sounds as if there
is a gear that centrifugally engages once the car hit certain low speeds. After about 35 mph no more problem. It sound much like a bad starter gear against a flywheel. While the truck is in 4H no grind. It seems that the 2H is not completely disengaging from some gear or wheel. Any suggestions?? Thank in advance.
Ron Olsen
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