On my 1980, the strut bracket attaching bolts run through the aluminum differential carrier. They appear to have a blue coating on the shaft of the bolt. I presume this is for corrosion control. I don't find reference to any coating on these bolts in the A.I.M or the shop manual. The bolts attaching the spare tire hanger to the differential carrier also have this coating.
Does anyone know what this coating is?
Does anyone know what this coating is?