Quote:
Originally Posted by speeder
Just to really complicate things slightly, Ford specifies an additive that they sell in small bottles as a friction modifier for their LSD axles, at least on my generation truck, (early 2000s Super Duty). If you use off the shelf GL-5, which already has a friction modifier in it, then add the Ford additive, you will wind up w a limited grip rear axle instead of a ltd. slip. A one-wheel-wonder, as we used to call open diffs when I was a young guy. 
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+1
Should be 90W for the diffs. ATF for the transfer case
Had the 351/C6 in our old motocross box van. Put that thing through serious abuse and it always got us home from the desert.