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Wrong on about all of this. He needs to first find out what his caster angle is. You are correct that the proper and permanent way to fix it is to cut and turn the knuckle balls, however in most cases and for most people steel shims bolted into the leaf pack work just fine. It would be near impossible to rotate the perches on a toy housing and the pinion would have to be pointed pretty damn far upwards to cause oiling issues, especially on a part time 4wd axle.The next issue now becomes the work involved to get this correct caster angle. The correct way to do it is cut off your balls, rotate to your desired angle and weld them back on. The easier way is to cut off the spring perches, rotate the whole axle to desired angle and weld them back, but this tends to lead to pinion oiling issues and is not recommended.