My seal supplier has ordered me two outer and two inner seals based on the dimensions that I gave him. I will post pictures and info when I get them.

Well, here it is, a modern seal which will likely fit 48-50 axles. It's a CR seal (Chicago Rawhide). Pictures below show the seal as I assemble. I put the felt wiper back in, figured it would hurt it to be there. Sorry that some of the pictures are a bit fuzzy. I didn't realize it until after the fact. Hope this is a help to someone. I am currently working on inner and outer axle seals. Will also post that info when I get it settled.

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OK...for the pinion seal. The first picture is the seal in the seal carrier. The two bumps are from me putting in two screws to pull the seal carrier out of the diff housing and I soldered them shut. Next is the seal and felt wiper out of the seal carrier, looking at the seal carrier from the inside. Next picture I flipped the seal carrier over to show what it looks like from the outside. The felt wiper acts a dirt wiper, with the oil seal behind it. The next picture is the modern seal. I was going to install two of them back to back, to have one work as the wiper and the other as the oil seal, but there is not enough room to do this. I have asked my supplier to see if he can find a double lip seal with the same dimensions as the one in the picture. If he is unable to, I will re-install the felt, put the modern seal in as the oil seal and re-install the seal carrier in to the diff housing with a smear of gasket maker on the outside of the seal carrier. I figure this should work just fine as the pinion shaft has a slinger ring on it that covers the front of the pinion seal. I will re-post when I my supplier lets me know.

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I have pinion seal info to post. How do I post multiple pictures. I can't put in more that one in the upload line. Do I just put them up in separate posts?

EDIT 02/17/14 - Thanks Wes. Forgot I had to attach one at a time.

Thank you both OD and BDeB. I'll see what gasket I have around that's about 30 thousand of an inch. Add a little rtv gasket maker and down the road we go. Now to play devils advocate. At .030 thickness, do I really need it. Some gasket maker and put it together. Really shouldn't cause that much miss-alignment. Again, switching sides, if I don't put the gasket in, and use just gasket maker, if I ever have to take it apart, with out the gasket it will be a pain.(speaking from job experience). What a switch hitter I am....LOL. I now have just to get my car home. In storage due to renovations on my shop over the winter.

As far as the pinion seal, it is a two piece set up. There is a carrier that the actual seal goes in, then that is pressed in to the housing. The original number on the seal, stamped in the casing is 50066. It is a National seal. I have called a local seal house and it crosses in to a Chicago Rawhide number of 16117. Dimensionally it will fit the carrier and has the correct ID for the pinion shaft. I have ordered two of these, and as soon as I have them and can verify that they fit and work properly, I will come back here and confirm and also put it in the cross reference chart. I will also post some pictures.

Does anybody know what the correct thickness of gasket is to seal the carrier to the housing? I want to make sure the carrier is in the right spot to re-install my axles.

Thanks for the opinion Peter. It's something I am considering for better 4 lane rpm's. One person here has already done this and as far as my knowledge, has had no ill effects due to the change. Now as OD pointed out about damaging the taper by using the drum to remove the axle. I have access to a lathe and have the drills and taps required to make an adapter for my slide hammer, I thought about it, and decided to, and have already made the adapter for that very reason. Still working on the pinion seal also. If anyone has replaced it, please chime in. I will post what I find/ end up doing here and in the parts interchange.

That makes sense. The axle is a spare I bought to replace an axle shaft of mine that has a damaged taper. I got the drums off and was able to turn the pinion and determine that it's a 3.9. Mine is a 4.1 with overdrive. My intention now is to swap out my 4.1 carrier for the 3.9. Does anybody have an idea as to what pinion seal to use as it's leaking.

Re post 10...I'd still like to know why you multiply by two. Thanks.