Re: 12 bolt gear oil
2qts should be just right. As far as axle bearings go on axles like a Ford 9" the seal is in the tube behind the bearing from the factory. I can't remember how it is with c clip eliminators. I never saw the advantage of the heavy shockproof in a rear. I prefer flow over it sticking to non wear parts. It's impressive if you disassemble as gar as how it coats everything.
As far as support goes I don't think anyone holds a candle to Lucas for support and their products are great. I like Lucas synthetic gear lube.
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