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Old 07-30-2003, 09:54 PM
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which posi best for street-ford 9 in.

hi everyone - new member here. i want to install a new set of 3.73 gears and a posi unit in my ford 9 in. currently in a 69 camaro, mild 350, th-350, 28 spline axles. don't know what kind of posi. to go with yet, so if anyone has any suggestions, i would love to hear from you. looking for a streetable unit, that can stand some abuse. nothing noisy or too rough for street use. what about stock trac-loc? might see some occational strip use. thx

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Old 07-31-2003, 12:22 AM
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We ran an Auburn posi and it performed very well. We were running about 400HP at the time. When the HP jumped to 650, we switch to a Detroit locker. The locker is definitely noisy, but not bad.
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Old 07-31-2003, 01:43 AM
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I tore up my stock trac lok in about 10k miles with only 260 ftlbs at the wheels and traction bars. ITs made for unmodified cars, and although is the most streetable, it cant take much abuse before it wears out.
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Old 07-31-2003, 07:38 PM
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Most likely if you're looking for gears for a Ford 9inch rear you're talking 3.70's. Either mustang66 got a bum differential or I got lucky, my Traction Loc differential has been taking a beating for for almost 10,000 miles already with no signs of trouble. This includes holeshots, powerbraking at the track, and a trans that chirps second every time. If you jinxed me mustang66 I'm gonna cry
I'll probably be nervous now for the next 5,000 miles.


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Old 07-31-2003, 09:45 PM
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does eaton make a posi unit for the ford 9 in? i can't seem to find one in my catalogs.
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Old 08-02-2003, 10:39 AM
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Eaton doesn't make a posi for a nine inch because the axle hasn't been made since the early '80s. Auburn is the best posi. But if you are building a high torque motor, any clutch type posi can wear out. In that case you would need a locker, or an auburn, which is a ball/ramp style posi.
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Old 08-02-2003, 11:47 AM
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I thought Auburn was a cone-type.
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