I hate to jump into this thread, it sounds like you might know what my problem is too pinion head. I have a 8.2 housing with 3.42 gears and posi. The posi has 4 pinions and is a cone type. The axle flange on the good side has 3 holes and is outer seal type. Stamped numbers on the left had tube facing to the rear are N166. Casting number on same side facing rear on the center section is 67890 I can't get any 28 spline axle to fit except for the one that came in it and some incorrect inner seal style axle. The splines won't pass the Cone Clutch's splines.
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1967 GTO hdtp
red on black
400/335hp
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