This video discusses using a 4l80e transmission without computer control. Note that the video says the transmission will bolt in - what is meant is that it will bolt to the engine. The drive shaft was shortened and a crossmember was fabricated out of a piece of c-channel steel. Some 2 inch diameter pipe was cut to length and used as spacers for the fabricated crossmember to give the proper height under the rear of the transmission.

MegaShift has a pinout for the transmission connector:

http://www.msgpio.com/manuals/mshift/...