This is a new very high quality and correct pair of inner oil seals for the Dana 25 and 27 axles. These are the small seals that are on either side of the chunk. They seal around the axle shafts where they enter into the diff. These are almost always worn out and are quite frequently missed in a restoration. That is why the gear dope ends up in the axle tubes. This is for a pair. QTM Parts . The Dana 25 axle is stock on the MB, GPW, CJ2A, CJ3A, M38, M38A1, and early CJ3B. The Dana 27 is the stock rear axle on the MB, GPW, and Very early CJ2A. This is the rear axle that looks like a 3/4 ton truck axle with the large hub housing that sticks out.