I was looking at the something similar. I wanted to save weight because I run stock 4.0 and trying to tow with my Tacoma rated to tow 6500lbs. I was going to use a 79 HP Dana 44 with 1/2" thick tubes and running Dana 60 outers. Then looked into the Jana 54 kit. Debated on Stock 60 shafts or chromos, then thought Dana 44 RCV's were as strong as stock 60 shafts why go through so much trouble changing out the outers.
I came up with these simple ratings based simple off web wheeling and others experiences while running a Jeep 4.0 on a ~4,000 rig.
Stock 44 - beating on it = 35" tires, babying it = 37"
Built 44 - beating it = 37", babying it = ~38ish
Built 44 with 60 outers - beating it = 39", babying it 39" reds
Stock 60 - beating it = 37", babying it = 40"
Dana 60 built - beating it = 40", babying it = 44"
Dana 60 40 spline shafts ??
Everyone will have their own opinion but thats a start.
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