There are no numbers stamped where your pic shows. The numbers I mentioned are on the housing that holds the pinion seal close to the housing away from the seal. There are three raised vertical ridges, the last ridge is shorter then the first two. The numbers (370340)are between the first and second ridge and the stamping D1 is between the second and third ridge. I did the rotation again turning the drive shaft and I get a little over two turns on the wheel. If I times it by two I get a gear ratio of about 4.11. So I now think that the rear is either a 390 or a 411. Does that seem correct?
