I was bashing my 4x4 around a playground a week or so ago, and filled the inside with wood chips, got it all cleaned out, and there was a terrible rattling sound coming from the center shaft. Wood chips got in it. Got it all cleaned out, and now i'm noticing that unless my slash is in the right angle/direction, it will only run 2wd. It looks like a positrac. I ran it on a BMX track today, and noticed the most when I couldnt grip for anything going over a small dirt bump.
Do i need to tighten the shaft? what are some other things that could cause this situation? and what are some solutions I should try?