You say it's a driver to run around town. Take off the old "coil over" shocks and put on regular shocks. This will eliminate the leak which is your original question. Coil overs are a waste of money on that truck. Shocks don't carry weight, they absorb coil spring rebound. Dampen the movement. The coil overs don't help with load carrying. The coils are to accommodate adjustment/ride height and some side load/performance benefits........ for performance vehicles not old run-around trucks.

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn