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John, have you actually verified by the BOM that a '68 housing has a drain plug? I went through this years ago and came away with the thought that only the '66-'67 units were unique by having a drain plug and being a bit narrower than the other B-body Dana's.



I was actually at the car that has this rear today but didn't look at it , I'll have it checked but I am pretty sure it is a 68 axle .