From the pirate 4x4 bible:
http://www.pirate4x4.com/tech/bible/index.html
Dana 44:
Used in 1967 to 1991 FSJ (J10, J20 trucks, Wagoneer, Cherokee)
Dana 30:
Used in 1971 to present Jeep CJ5, CJ6, CJ7, CJ8, YJ (Wrangler) & TJ, and 1971-1973 Cherokee & Wagoneers
So from that it COULD be either a d30 or a d44. I haven't heard of too many waggies with d30's.