I've never had it under any of my trucks but from my friends' experiences I wouldn't rearch springs. Spend the money and get new springs either over the counter or made custom for your needs. Most of the rearching jobs have resulted in some combination of a rough ride, sagging suspension, eventual spring breakage, and money best spent elsewhere.
My buddy's rearching job proved that it is possible to get a ride worse than the stock rear springs of an 80's GM 3/4 ton.