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1994 f150 4x4 4.9 I6 5-speed regular cab. The vibration starts at 60-65 mph and gets worse if I keep accelerating. Vibration stops instantly when I let off the gas even when going over 75 mph; that makes me think it's not the tires (even though it could use some new ones). I don't feel it in the steering wheel and it's like a deep noise, kinda like letting out the clutch when you accidentally shift to overdrive from 2nd gear. Is it an ignition issue? Driveshaft? Rear end?
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.
