the 400 shocks are not that stiff. anyway if the shocks are not busted u can get the Highlifter lift springs which are about 85 bucks for the front and back. This will get rid of the sag and they will stiffen the ride up alittle. Also there are some 400 shocks on ebay. You can also put 450 foreman shocks on the 400 and this will add about a inch of lift.