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Re: 91 chevy open diff swap to posi lock
There is usually a screw-mounted tag attached to the housing to indicate this. If you are looking at donor trucks and not just rear axles, you can look for the G80 option on the RPO label in the glovebox.
Also make sure you match up the gear ratio otherwise you're speedo/odo will be off. Hope this helps!
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Current Garage:
2009 Honda CR-V EX
2006 Mazda 3i
2004 Chevrolet Silverado 2500HD
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2003 Pontiac Vibe AWD - 1999 Acura Integra GS - 2004 4.7L Dakota Quad Cab 4x4 - 1996 GMC Jimmy 4wd - 1995 Chevrolet C2500 - 1992 Toyota Camry LE 2.2L - 1992 Chevrolet S10 Ext. Cab 4.3L - 1995 Honda ST1100 - 1980 Yamaha XS400 - 1980 Mercury Bobcat.
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