HI XXXXXXX
GM HAS UPDATED FLUID FOR TRANSFER CASE TO HELP WITH CHATTER FRON OUT OF TRANSFER CASE CLUTCHS YOUR SUPPOSE TO DRAIN OLD FUILD AND FILL WITH AUTO TRAC FLUID AND DRIVE SLOW IN CIRCLE 5 OR 6 TIMES BOTH WAYS AND DRAIN FLUID AND REFILL WITH THE AUTO TRAC AND WITH 500 MILES THE CHATTER SHOULD GO AWAY
YEAH WHEN THEY START CHATTER IT WILL RATTLE PRETTY GOOG
ASE Certified Technician
15YEAR WORKING ON AROUND CHEVY {GM CERT TECH}