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Old 04-25-2013, 01:24 PM   #11
MMC

 
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Drives: CGM 2SS/RS, 1987 & 2014 Silverado
Join Date: Oct 2010
Location: Spencerport, NY
Posts: 1,012
The Eaton locking differental requires more than 200 RPM's differance between sides for it to lock. They also will not lock at speeds above twenty MPH. G80 is the correct RPO code, in use by GM since the 70's.
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