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RE: [A/S] '01 Duramax
Look in the glovebox for the code G80. If it is there then you have an
Eaton Locker. Chevy did not offer a limited slip in the 2500hd. My son's
'90 1500 4X4 has a G80, my wife's '95 Astrovan has a G80 and my '01 2500hd
has a G80 in it. If you go to the Eaton website it will explain how the
unit operates. My '92 Z71 4X4 had the standard open differential and I sure
wished I had the G80, a Detroit Locker or a Detroit TrueTrac.