anyone using those old school air shocks with air line and air fill in rear on a expy?. i saw a pair on a 69 charger on lift this morning....had a pair of white high jackers! i remember those. seen MOOG springs...look good but i think id rather go with changing only shocks that have spring on it .....or the AIR SHOCKS would be nice on my expedition.....if your using shocks with spring on them....how do they feel in rear ?