Installed one set of used gears in a 68 Firebird for a friend. Horrible gear whine after all that work. Learned my lesson. But once, cry once…..Spend the money get a new set of gears and don’t look back. Certain parts are just fine used, for me a ring and pinion is not one of them.
Just installed a fresh set of 3.73’s in my 71 GTO, went in well and no gear whine whatsoever, Richmond gears.
Just my .02
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71 Goatman
Hot Rods & Horsepower.......A diease for which there is no cure.
71 GTO, 463, SD 295 d-port heads, 10.75:1, RPM intake, 502hp/560tq @ the crank, 200r4, 10" Continental convertor, Bullet 234/244 cam, Cliff's Q-Jet, 3:42's w/Eaton True Trac, 5 Power Tours. New performance numbers coming 
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