Bob,
Dana 25 with Perch...Outside marking is tough to read. 1 24 48... Of course, the last digit is the hardest to make out, so not sure on the '8'. Same axle...ring gear... 1 12 49E
I can't make out any date markings on the exterior of the axle with no perch. Either too many coats of paint or no date marking at all. I am looking at the raised donut shaped area on the front of the axle. Is there another place to look without opening up the diff?
Tim