I built this setup and ran it in my Ranger for the past couple years (I just sold the truck). It sounded great and was designed to fit perfectly behind the seats in a regular cab ranger (between the two rear speaker panels). The little sub can hit really hard if you tune it up well, and it sounds wonderful with a wide range of music.
It has a JBL 8" subwoofer in it, specs below:
All powered by a four channel Kenwood KAC-8402 amp (I had the back two channels bridged for the sub, the other two front channels are free to drive a set of components in the front). Amp specs below:
PICS (there are a couple pics of it pre-carpet so you can see how well it was built. The two amps on it are not the one I'm selling, you can see the Kenwood in the installed pics):
It's a really nice setup that works perfectly in the regular cab, which is rare. It is also in fantastic shape (I'm obsessively clean). I can ship you the original boxes for the sub/amp, or I can just send you all the manuals if you don't need boxes.
$200 shipped anywhere in the continental US. Less if you want to pick it up in MA.
Feel free to post/pm/e-mail me any questions you have.