My drive shaft doesn't have an oil retainer.
I'm having trouble uploading a picture of the drive shaft and pinion gear, but it looks like others I have seen in discussions in this forum.
By the way, even though the diff cast number indicates the shaft and diff are a $7, I'm now almost certain it's a 36. The 36 bushings are what fit this assy, not the 37s. A real stumper to all in this forum.