I have 2 mtx road thunder 8 inch box speakers that i'd like to install in my 1991 Chevy s10. Thing is, i have no idea whatsoever how to go about doing this. Everything in my truck right now is stock.

Box speakers? Do you mean subwoofers?

You can take any little piece of angle iron and screw into the box and use tapping screws with rubber washers or silicone seal to mount the other side to the floor.

Probably behind the seats or underneath them.

-N-

cut hole in wall between cockpit and space beyond (cargo area).
Mount said speakers into the holes , magnets face outward.

cut hole in wall between cockpit and space beyond (cargo area).
Mount said speakers into the holes , magnets face outward.

Dont do that, the speakers will rust and the rubber surround and spider will decay.

I have a 98 S10 with a 1000watt amp and two 10" low-profile Pioneer subs.

http://i4.photobucket.com/albums/y101/Toxarch/PioneerSlimSub.jpg

A friend of mine made a custom enclosure for all this, but there are boxes designed to fit behind the seats.