I run a 5 foot KK on my JD 430, I think it is only about 25 hp. It could be using the wrong shear bolts in the KK, maybe wrong grade, I think it called for grade 5 in mine. I have broken very few shear bolts except hitting big rocks. I think there were different gear boxes on the KK that they could be ordered with, a 35 hp and heavier 55 hp. I suspect on your superA, when you engage it it pulls your motor down some and that takes up the shock, on the 450 with more hp, it puts the shock on the shear bolt.
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