I'm assuming you have 2wd, I checked your info and you didn't post it. I'm not too familiar with this stuff but till someone with more knowledge posts, here goes; You probably have blocks that you can remove between the springs and rear axle. And you can do a shackle flip, if you take the rear spring shackle mount and reverse the mounting it will lower your ride. I'm not exactly sure how much this will get you but a little time with a tape measure will get you close. For the front, I'm guessing, I think you have coils. Old cheap way is to use a torch and heat the coil till red hot. It'll relax and settle down next to the coil beside it. This is a one way trip so do it half a coil at a time. You also lose some suspension travel so think this through first. Make sure you have all the stock rubber bump stops in place, front and back. I'm sure there are other, better ways, someone else will have to chime in though.
Good luck,
Richard