ive taken the motor/encoder assembly off. left it plugged in and manually put the t case in 2wd. made sure it was fully engaged and drove the truck. if the noises go away t case is fine and you need a motor. if the noises are still there get both.
going manual im not entirely sure if it will effect the ECU. i have yet to see transfer case codes come up on an engine scan. had to have a better scanner to read the 4WD "computer" codes.
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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