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Well, here's some second-hand information...
Jeep went with a D44 front axle in the Rubicon because the testers at New Venture Gear kept breaking the stock D30s when developing the 241J with 4:1 ratio. The torque was too hard on the D30, although, I don't know specifically what parts broke each time.
I think depending on the type of 4wheeling you do a D30 can be made to last through quite a bit of abuse. With alloy shafts and indestructable u-joints you have to start to worry about what the next thing to go would be, if anything. The ring and pinion seem pretty small to me, but then again, it also seems the rear axle is doing most of the work, most of the time. I don't think a stock (meaning no alloy shafts, etc.) TJ D30 will last too long with heavy use with a 4:1.
Áron O'Proinntigh is ainm do
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