Update:
this is how far I got today...
installed 4 x Infinity 3.5" units.. both the dash and the rear were tricky and needed some adjusting to space the speakers out etc, new holes drilled...
2 x Pioneer 6x 9 installed in doors...
all topics regarding this were very helpful, however none mentioned polarity of sotck wiring in doors...
right door pink is positive and left door red is positive (thanks to whomever it was who posted full wiring diags for the FJ... found color coded stereo diag on page 40 (ish?) )
Made a few other minor changes... you dont need a dremel as mention in the post (for door install).. side cutters suffice to hack up old speakers (if you can even call it that... how pathetic! no wonder it sounds like crap!!!!!)
I'll post pix later...
next plan is to get amp and I guess intercept feeds to the 6x9's ...
the 6 x 9s are rated at 230 w 80w RMS ....
what kinda amp should I look at to drive them and also a 10" sub (not yet purchased) ?