Are you using thread sealer or RTV in the splines in the yoke when you install it? If you aren't then you probably have a leak coming through the splines. You always have to seal the splines, but do not put the sealer on the pinion. Always put it in the yoke. If you put it on the pinion then you will push the sealer into the outer bearing when you install the yoke.
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Freddie
1969 Camaro RS/SS396 (427) 4 speed
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