[odjeep]

Double clutching is what is done on transmissions without synchronizers like a rig or dumptruck. It is basically the act of getting the drive gear in the transmission to go the same speed as the next higher or lower driven gear. On upshifting you: 1) push in the clutch. 2) pull into neutral. 3) release the clutch. 4) let the rpms fall to where they would be in the next higher gear at ur current speed. 5) push in clutch. 6) put in next higher gear. It may sound difficult but it happens so quickly that u dont think about it. Its essentially shifting the same way that u do except u pump the clutch twice while doing it. Downshifting is practically the same with the acception that in step 4 instead of letting the rpms drop u want to ''spike'' the rpms with the throttle so that the rpms raise to the point, or higher, where they would be in the next lower gear and then go on to steps 5 and 6. It sounds complicated so i hope this makes :) . It did when I was thinkin it. .
The thing is, double clutching works in the foreward gears when the synchros are failing. Reverse has no synchronizer and therefore does not need double clutching. I hope this helps ya out.

od