8 3/4 Diff Gear Lube

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Re: 8 3/4 Diff Gear Lube [Re: markfh52] #1690210 10/25/14 01:05 AM 10/25/14 01:05 AM
Joined: Nov 2007 Posts: 21,840 Kirkland, Washington Pacnorthcuda Too Many Posts
Pacnorthcuda Too Many Posts Joined: Nov 2007 Posts: 21,840 Kirkland, Washington	Quote: What gear lube would be best for the 8 3/4 posi diff. I know there's a limited slip additive that needs to be used but I was checking out Castrol 75w-90 synthetic limited slip lube. Can that be used or is there a better alternative. Thanks Your choice would be fine. For the additive go to a Ford dealer and buy it, it's the original formula MOPAR used to use. If your ""posi"" is a cone type the additive you choose really doesn't matter, if it's a power lock clutch unit you want to feed it the best.

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