Well......here is something to think about. Depending on the type of plane (the direction the gear retracts....forward or backwards) if the gear retracts forward it would be fighting against all that relative wind. In other words, the retraction system would have a "great force" pushing in the other direction. When you extend the gear (assuming backwards) the relative wind is actually going to aid the gear get into the lock position.

Does it make any sense?

TI