Sure have been there. Take it to a spring shop you won't even have to dicuss it . They will tear apart and evaluate in about five minutes. A good spring shop not general repair will have everything you need to rebuild , re arch the old leaves ,change u bolts and you will be on your way in no time. When I say spring shop I mean for large trucks. They are usually extremely well set up ,very efficient and fair on pricing. The sooner you address it the better. The longer you wait the greater the bill will be. Good luck.