Automobile Enthusiasts

it's possible. I have a 2003 Sport Trac with 160 thousand miles and these parts are still ok knock wood. Depends on where you live as to replacing parts because it the salt belt cars become so crusty that most times fasteners and hardware have to be cut off making re-use impossible. The only reason I can think of that 1 spring was sagging is it was broken and yes you should replace in pairs. 4 thousand dollars seems quite excessive as parts you described shouldn't be more than1 thousand dollars at the most. Good luck with your Sport Trac.