My 67 Fairlane has a 9 inch rear axle out of an unknown vehicle. I went to replace the diff oil and found out the 3rd member does not have a filler plug and neither does the housing. I can pull and axle and put the oil in but it’s inconvenient. Someone welded a truss on the back of the housing (they did a really nice job, gag!). Anyway any chance there is a plug under the truss? I’m ready to use a hole saw to find out or maybe remove the truss as it was poorly installed anyway.
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