Killer,
I noticed that on some of your trucks (especially the one with 6X6 drive) you have used some worm and worm gears. I am curious to know how did you managed to get hold of them. Also, which servo gear set do you normally use? I have a big lot of stripped gear from my HS81 micro servos (that is what happens when you crash helicopters, a lot of broken parts pile up at your home
) But there aren't really small.