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Can I use GL-5 80w-90 axle gear oil ?
YES, BUT IT'S NOT THE EXACT SPEC.
NO, IF YOU HAVE LIMITED SLIP (RPO g86?) WHICH REQUIRES MODIFIERS IN THE OIL
Also how do I know what size is my rear ?COUNT THE NUMBER OF BOLTS IN THE DIFF COVER OR INSPECT THE RPO CODES LISTED IN THE PASSENGER SIDE GLOVE BOX.