Help me ID this Olds diff Please!

I have an Olds diff. in my 37 GMC panel wagon and I need axle seals for it. I think its 57-64 Olds but not sure, got 4.88 gears in it for sure. The passenger side has casting numbers 522488 and the drivers side says A227. Was going to call NAPA and order but I need a model and year. Thanks for all your help!

 

There is a big thread on "Olds Pontiac rear ends" . I am sure there are ways to ID it on there, and I thought there was some seal number info ...maybe.

If you can't find it, I will look later today

 

The casting number should be 522498 which is first generation (second generation was 535200 or 534548, third generation was 543317)

The date code is A227, January (A) 22nd, 1957

 

on my olds rear end the bearing is open on inside to rear end gear oil/outside of bearing is sealed&has 'o'ring on out side diameter to seal to inside of axle housing/each time i service it i pack it with a little bearing grease........

 

Thanks so much for the info gentleman that should be enough to get me the seals I need. The 5th number was hard to read it must of been a 9.

 

Pics are a big help. If I was "smart", I would have kept track of actual 6-digit casting numbers over the years. But I didn't. Usually can ID by looking at a few things though.