to begin with, inspect the axle boots if damaged torn the axle have taken water from under carriage splash or engine bay bathing ritual at service station. The grease has melted away renew the axle grease and replace boots.
also please get the front wheel bearings inspected, if they are rusted oily change both bearings ask the ustaad to use Caltex grease in worst case, or else get silicon one for fresh new bearings.
The sound is not from transmission - @umar47