I needed to get a different shank when I went from a Chevy
1500 to a 2500. The receiver height was higher on the new truck and the suspension was stiffer. I found my best deal on a new shank at Summit Racing. If you have hole positions lower on your existing shank, you may be fine, but start off by measuring the height difference between the 150 and the 250 and see if there is much difference. If not, you may just need to play around with the head pitch based on the suspension stiffness.