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I think the sound you're hearing is the valve train complaining cause all the oil drained away. Once you're started and the oil pressure kicks in, oil is delivered to those complainers, and they get quiet..no problemo.
It may depend on the year. Try one of the tranny foruims here,,somebody will know. I've read the 5 speed has a .80 overdrive, whereas the 4 spd has a .70.
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.