fastswg211
New Member
There are several versions of the ford 9 inch rear differential, One version does not have an oil filler plug, It has a flat spot on the driver side where most of the filler plugs are located, but it was never drilled and tapped by Ford at the factory. I'm wondering how fluid is added to this type of rear end. Does anyone out there know of this? My axle housing has a drain plug on the bottem but also has no way to add oil.:neutral: