Cornman, I think you will notice the power increase. While the threshing system is nearly the same between 1440 and 1460,the propusion,drive axle and support frame are quite a bit heavier on the 60 model.i have seen a few 40's that have the drive axle broken clear loose from the combine frame ,so would encourage you to look that over before you repower...May be long term easier to just go to a 60..