I have searched threads and may have the chirp in the pillar/cowl area referred to in the tsb for trucks through 2001. Mine is a 2002 though. Before I pull the whole dash back and attempt the procedure in that tsb I am wondering if anyone has found a miracle cure to a mysterious and VERY IRRATATING chirp when hitting small bumps? It almost sounds like something swinging against another part but I can not find it's source. Can't produce it by bouncing on the truck. Can't pinpoint it with stethoscope when driving. Greased, moved, bent areas a little with a punch but no change. Does this sound like anybody elses problem and did you perform or have the procedure done where the dash was pulled and a chisel was driven between a gap to separate the metal a little? Did it solve the noise?