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I have a 87 Buick Grand National with a Moser fab 9 housing, Trz double adjustable arms upper and lowers with heim joints on arms, poly urathane motor and trans mount. Car has no cage? What should the pinion angle be? Thanks
 

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I would think you only need -1 or -2 degrees down from the engine/trans angle.
 

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^^^ this is a good starting point. Power and tire will dictate minor tweak. Video of diff never hurts to see whats going on to.
 
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