I was wondering what, if any, problems there could be with lowering or raising my pickups on my bass? Also could anyone give me a good site for overall help on raising or lowering pickups? Thanks.
Raising and lowering is simple- you just screw or unscrew. That's it. You may get extra pull from the magnets when the pickups are higher. I heighten the treble side of my pups for a little bit of extra overall treble personally.
read up in the ultimate bass thread. There's a good quantity of important stuff in there.