The lug pattern is different for 2002. I have a set of wheels that I'm pretty sure would fit your truck but definitely do not fit mine. I was considering reaming out the holes since it's close but that's a nasty hack.
You should be able to get decent FE from that, by full size truck standards.
You can find your axle ratio, and loads of other equipment, by using the RPO codes (printed on a label in the glovebox), and possibly by feeding the VIN into a good VIN decoder. Axle-related RPO codes begin with 'G'.
Feed your RPOs into this:
http://lonestarthunder.com/m_rpo.php
or feed your VIN into this:
http://compnine.com/vid.php
The VIN decoder is really cool, it does more than just give you your RPO codes and equipment...definitely check it out.
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