The 'posi's' in the 14 bolts are actually a gov-lock. They aren't all that good and most will tell you to walk away, but it depends on what you're planning on doing with it. I used to have a '78 C20 Suburban with a weak 327 (originally 454) running 8.75 x 16.5 tires and never had a problem with the rear end....even with the 454. I don't think they require any special oil or friction modifier additive like the clutch type posi's need. I could be wrong though
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Originally Posted by RaysK20
Can someone tell me about the factory posi in the 14 bolt. I spotted one local for 50 bucks and came from a running truck thats being parted. I will probably buy it, so what kind of oil should I run in it? I assume its a clutch limited slip of some form.
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