Looks like a jeep to me, sure.

Dana 30 did not exist till 1972 in a jeep steering axle.
66 in Early broncos and scouts.
1959 d 30 Nope.
Pre 1966 they were called dana25, post D27 in the closed knuckle trunnion bearing style.

That is a japanese based axle in a japanese vehicle on a jeep forum?

Jeep *****, what is the difference, they both start with J.
You did need some ragging, sorry.

That is called a steering knuckle wiper seal, they come as a kit from a Mitsu dealer. The whole outer including the knuckle needs to be taken apart to fix it. If you have more than 80-90k miles on it, get a trunnion bearing kit too, with a shim pack to adjust preloads.

SD