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There are two units. 1. The carrier (differential) looks like a CRD-78.  There is a flat area on the passenger side, I believe, that would have that number hand stamped in it. It would also have the ratio and a part number. 2. The axle housing itself has a model number, and there are at least 4 choices that used the CRD 78 carrier. they are: RAD507 ,508, 509, and 512. That number appears to be almost visible in your middle photo. Look on the back side of the housing, on the axle tube to the right of the Mack name. If you are trying to buy a pinion seal the housing number won't be of any help. Your best bet is to take the seal out and find the number on it. You will probably have to cross the old number over to something modern, but thee are seals available that will fit the CRD 78.

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Looks like I really goofed twice, the CRD 117, looks to be a newer version, but if you look at the primary reduction case, the CRD 78 is different than the 117.

 So I'll go hang my head and not lead you further astray.

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