I have a xxx-nt sport II. And in the instruction manuel it says to tighter the diff every so often. And it says in the manuel to do this.... Tighten it by lining up the
slot in the diff screw with the slot in the outdrive and placing the small Allen wrench through both slots. Now slowly turn the left rear tire
clockwise about 1/8 turn. As long as the diff screw was held in place with the Allen wrench, you have just tightened your diff. But I don't know hwere the diff is. Abd is the outdrive the thing that stick out of the clutch bell? I have only had this for a WEKK, and it's my first nitro, so give me a break. Can somebody tell me what they are saying that I can understand, tell me where the diff is and how to do it. thanks

The diff is the part of the tranny centered between the rear wheels. The outdrives are what come from the tranny, that you put the drive shafts into.
Study the exploded view for a while, and try to understand what the machine is doing...It will make it easier to troubleshoot.

OK, I got it a while ago. couldn't see the picture that good.