I think my mechanic's thinking was that going with the D30 would make future repairs cheaper/easier and give me a better Jeep in the here and now, but that the replacement of the front drum brakes with discs is what would boost the value the most.
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All tru. Having it functional is what will increase the value. The better axle won't increase it much more.
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.
The front driveshaft went to crap in the JK so I bought a replacement from Adams Driveshaft. My son swapped them out today.
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Jeep and guns.... Murica [Beer]