mile marker carries the conversion kits. they say the one piece output shaft is stronger. i put the four piece kit in my dodge and haven't had any problems. here is the link: http://www.milemarker.com/
79/CJ-7/AMC360/TH400/Q-TRAC/d30/d44/33's/Herculiner
79/CJ-7/AMC360/TH400/Q-TRAC/d30/d44/33's/Herculiner