Today after work I opened up the stampede and went on dismantling the gearbox, it is actually a "box" with the motor screwed on one end and just the half-gear sticking out on the other:


Inside the box are some gear-combinations, offcourse allot of down gearing, for more torque less rpm, but 1 combination wassent molded in 1 piece....

It is some kind of motor protection I think.... It doesn't show that well on the picture, but the hole in the large gear and the nub on the small one are supposed to be square but they are worn to a roundish state
When I pulled the trigger, the motor (running 12v 2600mah) forced the 2 gears appart (the "box" isn't made out of the same thickness of plastic as the rest of the shell) so the could slip....
So after I let a BIG sigh of relief I glued the 2 parts together and thats the fix!! Tommorow Test-day(I hope this is the correct place to post this....)