I did post how to set the diff up earlier in this thread.
Take spur gear cover off.
Hold both rear wheels and try to turn the spur, if it turns, tighten diff 1/4 turn at a time till you can't turn the spur.... then turn an extra 1/8th a turn.
If your rear diff keeps loosening, did you glue the diff plates to the plastic holders, check to see if they are still glued.... replae the diff srew and nut.
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