Rear End

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David, did someone say Ford/Motorcraft!? Lol

The friction modifier is specified by Ford for differentials with clutch plates such as the Ford Traction Lok. Part# is Motorcraft XL-3 and comes in a 4oz bottle. There is also a Ford Racing version (M-19564-A) but the XL-3 would probably be easier to find locally.

 

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