Called GM and they told me the trans axel fluid I need is no longer available. It's GM # 21018899 / SAE 75W-80. I called another place to see if they had a certifiable substitute and they said no and that I need to use GL4 synthetic lube. What to use?? HELP PLEASE
This is what I found for a substitute oil from Napa: http://www.napaonline.com/Catalog/Ca...107_0431873668
This is what I found for a substitute oil from Napa: http://www.napaonline.com/Catalog/Ca...107_0431873668
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