The brakes on the 250/350 have grown steadily over the years too, currently the F350's are almost the size of your older F550.
Rear axle sizes on the newest super duties have grown as well, even the srw diesel trucks having big dana axle M300 (11.8 ring gear), putting them part way between the old S110 in the 450's and the 135 in the old 550's. A lot of people think it was just a paper race with the trailer towing numbers but the drivetrains on these trucks have got heavier and heavier over the years to cope with the torque of the newer engines and the braking.
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Today's Featured Article - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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