Looks like this is another question getting different answers. If the 450 is the original type from IH. Without hubs it has spindles that use a different size wheel bearings than a original 300. Steering arm that bolts to the vertical steering shaft has a different bolt pattern. Rear wish bone support is different. Rest of the wide front parts were the same. If you get the hubs with the 450 wide front that just leaves the 2 parts needed to use it on a 300. 300 and 450 spindles are the same length and use the same knees. The different wheel bearings and hubs from a 450 would just give you more strength.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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