I have a 2001 international 4700 that I need to lift the front about 2" to 3". This truck has a vacuum tank on it and slopes to the front. Since it slopes to the front we can't fill the truck completely. The rear springs are air so I plan on doing dump valves to lower the rear when we are loading the truck, but I will still need a couple inches in the front to be safe. It has the Dt466e and a 8000lb spicer i-80sg front axle. A spring shop wants $1000 to do new springs but I was hoping to get some ideas on a cheaper way. The load won't change at all just need the height. Any help or thoughts would be appreciated.