A "lock up clutch" uses a mechanism that's driven by centripetal force, so that there's light lever pull at low RPM's but the clutch basically locks up solid when RPM's are higher.
For example:
![](https://www.phatperformanceparts.com/photos/1130-0006.jpg)
An air shifter is just a pneumatic cylinder that moves the shift lever for you. Push-button shifting.
![](http://www.pingelonline.com/product_photos/62104.jpg)
A little googling should provide some elucidation.
mystic_1