When the ring and pinion gears wear it creates excessive back lash. A good driveline shop will use a dial indicator to check the backlash and adjust it using shims. They will put some white grease on the gears and check the wear pattern of the gears to make sure they are meshing properly. Also,when the pinion bearing wears it will create some play in the pinion gear. This can cause a little play also. If you have a lot of miles on the vehicles, you would be better off leaving the differentials as they are. Sometimes adjusting the ring and pinion on a vehicle with a lot of miles will create a whining noise in the rear diff. Chock your rear wheels, put the tansmission in neutral and turn the driveshaft by hand. You will see the play in the driveshaft.

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