the problem is is that when i give it gas it wont move, the tires are locked,but will spin freely in the opposite direction, the spur gear does not trun when gas is applied, i dont know how the drive bar slipped (reverse/drive) out but when the truck quit moving i found it unhooked
any ideas what the problem is?

So tear it apart and find the damage. You might not even have any. If that forward reverse arm came undone, it may just be stuck in a somewhat neutral position. Either way, it would be a good idea to get into the tranny, and check for damaged gears. Post your findings.

so everything is mine, i got all the electronics off and started to get the tranny off and realized there was a rock on the clutch bell wow am i retarded
how did you rig yours to stay in drive i saw that you took out the shifting servo, i have mine rigged pretty good know but how did you do it