it actually uses a MOTOR, not a servo. even though this type of action is almost perfect for the servo, they don't have the torque to perform the action, we learned this early one, so used a motor with some gearing. The gears for shifting are beveled which gives a cleaner shift, I have some more rendered photos. All parts were made by my team in Maya 8. The shifter has a 3:5 and 5:3 ratio.
Update: I am posting some more pictures, and gather documentation on the shifter design. It should be posted on our site at
http://eaglevex.syraweb.org in a day or two depending on how quick we gather the info.