posi is nothing more than chevy's name for their limited slip. You can always double pack your OEM Traction Lok and maintain easy servicing on the diff.
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1996 Thunderbird LX - PI motor, SCT tuned. 14.22@98.19mph
2007 2WD Black on Black SCab Lariat - Putco LED Smoked hi mount, Scangauge II, Glock 32, Ruger LCP, Borla SISO exhaust, Volant CAI, VMP Tuned w/Xcal3, Pioneer P3100DVD, q-logic box w/Pioneer 10in Shallow Mount woofer, Dual 580watt amp, and a $20 Hong Kong special backup camera.
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