I didn't put the sprint 2 drift together... It came already put together... but I broke it down.. completely and started rebulding it as it was a kit... adding a few things here and there... the original slop I was talking about was the play in the dog bones... and excess space in the axles in between the knuckles... that was causing the tires to have a little play in them... I fixed this problem by eleminating the the play by putting 2 small o rings inside the diff shafts where the dog bones slide into... this allowed for the dog bones to fit nice and snug forcing all the slop out of the wheels... and before anyone ask... I checked to make sure it would not cause binding... still spins nice and smooth... will work for the time being until I upgrade to cv axles later.....