Allive 55-Glad to see your working on your truck-I have a stock suspention 55 chev 3200 in storage so I cant give a measurment,but I would say that if the spring is flat and is close to the snubber,it has sagged. I think mine is about 2-3 in off the snubber. I too love I beam trucks and gassers, but they will never be as nice to drive as IFS . Make sure you have no worn parts ,run radials Tilt the kingpins back a few degrees more than stock and set 0 toe in-toe out to start. A few things that have worked for me in the past. You may have to go with a dropped axle to get the ride hight you want. Good luck and post pics.