Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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Hello yes it can be an issue with the transfer case from what you are describing. Since it changes with the transfer case shifting in and out of 4x4 this is also a good indication it in the transfer case. Check the fluid level and condition in the transfer case, see if it shows signs of metal shaving or a fluid leak. It could be in the plantary gear set of the case. If the fluid level looks ok you would have to put the truck up on jacks and verify the source of the noise is coming from the transfer case itself before removal of it and either replacement or overhaul of the transfer case.
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Its a semi complicated job. You have to remove the front and rear driveshaft Disconnect any wiring or linkage for the transfer case. Unbolt the case from the trans and lower it down. In a suburban its a big case/bulky on your back. Then you have to be sure when installing you change any gaskets in between the trans and transfer case. reassemble. Refill both the transfer case and top off any lost trans fluid. Its not a cheap item to replace but if youre not comfotable it would be bes to let a trans or driveline shop look at it and overhaul it or replace it.
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