Anyone ever added this stuff to either the middle drive or final drives? Ford makes a really good one that quiets down a rear end substantially, so didn't know if anyone's tried it for a noisy/whiney middle drive? I've got a couple bottles of this stuff laying around. Stinks like already burnt gear drive oil.. but works well in cars/trucks.
http://www.frsport.com/FR-Motorcraft...il_p_2288.html
http://www.frsport.com/FR-Motorcraft...il_p_2288.html
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