Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
I am sorry for the long wait
where do you hear the loud noise from when it acts up ?
will the light show 4HI has been chosen but just makes noise ?
has the fluid been drained out of the transfer case yet to see if the fluid has metal flake in it yet ?
at this point the next step is to drain the transfer case fluid and see if there is any metal at all in the fluid
from the sounds of this there is an internal transfer case failure happening especially if it will not even move the truck at times
but have the fluid drained first and if there is any metal in the fluid the case will have to be replaced
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