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Mine does the same thing under really heavy load, but only when starting off. I thought mine was broke transmission mount or motor mount, but havent been able to find it yet. Only does it when I pull my 30ft. travel trailer. Feels like a knocking under the floor board with a hammer from underneath. Mine stops if i let off and start off a little easier, but doesn't do it after around 10-15mph.
Sorry to be so long, but let us know if you find out before I do, and i'll do the same.
Best of luck!
2006 CCSB FX4
ARP studs, Sinister EGR delete and coolant filter, Pmax stage 1 turbo, Edge CS, Amsoil oil bypass, CAT coolant, SCT with Matt's tunes, 4" turbo back exhaust, Air Raid, Blue Spring, fittings and dummies, custom homemade bedcover, Stanadyne fuel additive, tinted windows, and some brand new Michelins
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