What kind of shocks did you put on? I'm gonna guess the new shocks are gas type and the worn shocks were just that...worn? That will raise yer truck up a bit. Just adjust them until you git the right height...presto!

1998 T-100 Xtra cab SR5 2WD Auto; Roadmaster Active Suspension; Yokohama Geolander HT-S; lowered air dam; full belly pan; 4? diffuser; 11" side skirts; dual transmission coolers; 67% grill blocked; Auto-RX'd; ScanGauge II/Ultra-Gauge