We install Western and Meyer plows at work. Most of the time NBS and NNBS 1500 need a leveling kit to make the plow work properly. The key to "if" it works is the angle of the a-frame of the plow. The a-frame should be either level or or a slight rake down to the plow, truck side aframe higher than the plow side. You shouldn't have a problem with a 3.5" kit, you "probably" wouldn't have a problem with a 5" kit considering a 5" kit on a 1500 is "similar" to a 2500hd with a leveling kit.