Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.
If you do not have retractable is easier and instead of having two GEAR to one side only uses one which is the GEAR that compresses, it uses only the scale of movement of 100 to 200 on a scale of 1 to 200..
For CFS3 the gear animations are from keyframes 0 to 50, the oleo compression from 50 to 100.