My '56 Willys CJ5 had a D25 front axle. I put a D30 from a 1972 CJ5 on it, but not for value. I wanted the bigger drum brakes, 3" wider stance, tighter turning radius, sealed open knuckles and larger stronger shafts with more splines. Everybody in the old Jeep community said it was a perfect upgrade, and I got the whole assembly essentially for free.