I need help, do i need to lock my rear diffs? If so help me by talking me through it.

i tightened mine up by just putting the allen key in the flat head slot in the diff cup (its only on one side, mine was the passenger side) and tighten the other wheel by screwing it in clockwise.

http://www.losi.com/Products/Support...rodID=LOSB0289

look under resources in the manuals, one of them shows exactly how to tighten the diff's