Quick question, do you guys add a small bit of tube gasket seal material around the outside of the seal before seating the new seal? At the metal to metal fit.
63-79 Iron Diff's
Pinion seal = use Ultra Black on seal OD, grease on ID, #2 on the yoke splines.
Side yoke seals= same only nothing on the splines
Rear cover = Ultra Black on both sides of the gasket.