rear end question?

will do/ i spun up some gravel and it started whining. roared on decell and locked tires. left side still turns right side locked. someone told me the axle splines can have diff counts is this correct> guess ill pull one before i go and count my splines. thanks again all will update as i get it done. gonna be a little slow first time and i only have a day a week to work on it.