try the lube first. Go get a bottle of GM friction modifier from the dealer. It's the only stuff worth beans. Should cost about 7 bucks. I've had that stuff work wonders on clutch type posi units.
If you are making the kind of power you think you are, don't expect that unit to last long anyway.
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1968 C10 build in process
TT LSA/6L90e/9"
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