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I think it's a more common problem with Windsor cars. I've noticed years ago that I have oil puddle in the block valley plus an oil puddle in one of the bolt holes(passenger side), which leads me to the valve cover gasket. It might be because the gasket was messed up when my cams were changed.
Where is there oil leaking at the rear? If you look at the "pumpkin" or center section of the rear axle, it could be a pinion seal or differential cover leak. You would have to find which side, front or back, it was leaking. I recently had to change my diff cover gasket, RTV, which would leak at the pumpkin, and axle seals, which would drip around or on the wheels.
Where is there oil leaking at the rear? If you look at the "pumpkin" or center section of the rear axle, it could be a pinion seal or differential cover leak. You would have to find which side, front or back, it was leaking. I recently had to change my diff cover gasket, RTV, which would leak at the pumpkin, and axle seals, which would drip around or on the wheels.