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I would say if it has a bunch of miles on it just put new clutches in it. Considering the over all investment your gonna make clutches are cheap. It has been quite a few years but the last time I bought some for a 9" they were only about 100 bucks if memory serves me.
Kai is right, if you're tearing it apart its a good idea to replace them now anyways, regardless. If you really wanna pinch those pennys then you can perform a crude test by jacking up the rear end (block the front) and spin one of the rear tires by hand. If the other tire spins in the same direction, LS is working (though might not perform well under high stress, can't be deduced here); if it spins opposite, no working LS.
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.