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Originally Posted by tomp
Actually it is a good idea to use friction modifiers in all type diffs as it helps the fluid run cooler. This information comes from redline. It does not harm, in any way, diffs that do not require it such as the H2 .
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GMs literature (as well as infrom automotiveforums.com) specifically say in Capital letter to NOT use friction modifier in these axles. I know there's debate over it.