1996 GMC Savana 2500 Questions

All 1996 GMC Savana 2500 Questions

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My alternator was getting weak, but before i could change it, i went to go to work, and after starting and turning on head lights i saw alternator gage fall. put it back in garage and changed alternator and battery an...
I'm not sure if its a 4L60E, or a 4L80E.