How do i go about raising the ride height in the rear of the vehicle because the gas tank is keep scraping the pavement? Can i just put bigger coil springs on it?

My tb had ride adjust..but I found that if you get new shocks look for ones that have air fitting..used on mine to stiffin ride for taken off..there cheap and work good..they pump up with air chuck just like fillin a tire kept mine bout 80psi.. There are also (if real cheap)spring spacers they go in spring twist some screw and take some of the springyness out and give little lift..best is springs (sameas u had)oem and new air shocks..wonderchicken hoe!