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My '06 LB CC truck with extreemly low miles and Spartan tuned has had a noticeable vibration under load while in overdrive and under a moderate load that seems only to exhibit between 1300-1450 rpms. This has always been while empty pulling a hill fast or level ground while pushin it. (Usually around 20 psi. boost)
The vibration can be felt "everywhere". Even the passenger commented and can feel it in the floor, and I in the pedals.
Anyone have a simillar issue, or can offer clues?
I'm leaning twards either a driveline or trans issue, but not sure on this.
I just looked in a below thread with a similar issue on an '04
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.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.