Sounds like "typewriter"-- Normal Dmax noise- no worries. 
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Chevy 04.5 LLY, 265s, shell, XDR, TransGo, deep pan, blocked, fingered, de-badged, PVC mod, 65 Gallon Aero tank, PPE, LBZ- mod, Pre-fuel filter, tow mirrors, BU cam, gauges, GPS, Sirius |