I have done this several times, on 88-94 2wd truck like mentioned you remove the ABS control module and rear abs valve, be sure to keep the proportioning valve though you need it to keep proper brake bias from the front and rear brakes. Anyway run a new piece of line from the rear brake line junction on the frame just below the firewall to the proportioning valve and that's it. For 95+ originally there are 2 independant lines running to each front brake caliper that run directly to the ABS unit, there are 2 way's to deal with this, either unhook the both front lines at the abs unit and install a tee, or what I do is go the salvage yard and buy the front brake lines and proportioning valve off of a 88-94 the front lines on a 88-94 tee together originally so with this method there are no other tee's needed, I can get it all locally for $10. The rear on the 95+ still only uses 1 brake line that runs directly to the abs unit, it can be unhooked and hand rebent to hook up to the 88-94 proportioning valve, or you can just buy a new piece and run it from the junction on the frame under the firewall to the prop. valve. It's not difficult to do at all. Also one interesting note when the power and other plug's are unhooked from the abs unit on the 95+ the abs in dash light does not come on, even though you would think it should.
