Gmc grease fittings
Have a 2011 GMC 3500 Duramax. Two of the grease fittings are hard to get to, would like to change to 90 degree fittings. Does anyone know the tread size of the fittings.
Forum Discussion
The most difficult one is what I call the eleventh fitting. Many people do not know it is there. It on the idler arm high up where it is attached to the frame.
