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Check your rear U-bolts, U-joints, & springs. If the differential rotates too much when you put a lot of torque down, then the u-joints can bind or misalign, causing vibration. Check them with the trans in Neutral and the wheels chocked so there's no bind.
the combination of the axlewrap from teh blocks and the two peice driveline is probably causing the vibes.....it should fix it if you shim the carrier bearing down some
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
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