I have been designing, building and selling sway bar disconnect systems since 2001. Many people have copied my ideas and I often supplied specs for people who wanted to build their own instead of buy. Lately I haven't been selling them but simply coming up with new designs and putting them out there. It's nice to see people using the ideas. From this thread http://www.toyota120.com/forum/showthread.php?t=5293&page=2
My 2010 design for the 4th Gen worked but did have some issues.
That one took a while to come up with but I think I've come up with an even better design.
The new one, pictured releases the bar at the frame and allows it to slide on both sides. The amount of travel required at the frame is much lower than at the spindle due to the lever effect. IE hold your arm straight out and move it up and down. The distance at the wrist is much higher than at the elbow or shoulder. No rattles and has more travel than the stock suspension can utilize.
Anyway it's built like this:
4 4.5" M10x1.25 bolts
4 M10x1.25 nuts
2 pieces of flat stock
2 3.5" of square tube
Trace out and drill holes matching the sway bar bushing brackets in the flat stock. Make the holes big enough so things won't bind. Assemble as shown in the picture without the square tube. Clamp the flat stock to the bushing bracket and tack weld it. Insert the square tube and adjust the bolts so the square tube is snug but can be removed by hand. Tighten the nuts to lock everything. Use a hose clamp or strap to retain the square tube on the street. Remove the square tube for 'wheeling.
Caveats. The stock skid plate doesn't fit over the dropped bar. The bar is still higher than the undercarriage plate so a custom plate could fit.
If you use my design, please give me credit.