I've posted the "Dual Motor Gear Switching Assy" paper on the sharingFIRST site linked above and here:
Andy's SharingFIRST homepage
Look under "Mechanical Design" for the paper. I've also sent it to the folks here at Chief so they can put it in the White Papers section.
This drawings on this document are hard to read on your computer screen... you should probably print out the file in order to see the drawings.
Andy B.