I will say that with my 9 foot fisher on the front my truck barely moves when I lift the plow with the 2 inch lift springs plus the truck rides alot better. My truck, a 3500 quad cab had 039 springs on both side originally. As for these springs lifting the truck, that was half my point I wanted the truck to sit level which it does now. If I was towing or hauling alot then the truck would sit rear down a little. Also as bigramguy said I would try first and see where the truck sits, if you are putting on a 7 1/2 or 8 foot meyers plow on you could probably get away with what you have.