ulss tractors can run basically whatever you want as long as its under 650ci and loosely came in a tractor. The engine doesn't have to match the hood on any class running a component chassis(non ag rearend). The rules originally only allowed engines from 2wd tractors. But somehow a 903 cummins got in which was used in 4wd tractors and now there a handful off them.
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1997 2500 4x4 5spd
2011 2500 4x4 6spd
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