I pitched one of my questions over on hydraulics (about leaking q-couples on the control valve) and JJ helped me out. I think I will order all 4 and replace them.
Another question was on tires. I recently replaced the 2 fronts which were ag type Carlysle 7x16-6 R1. I'm shredding the tread on this hill country rock and was wondering if they can be replaced with industrial tread on the same rim? The industrials look to be wider and might require a wider rim. Also, the wheel height might then be different and cause some torqueing when in 4w drive.