>But you're only going in a straight line! No "differential" betwen the >rotation rates means no need for a differential, n'est-ce pas? The lock up >would be to keep traction if one or more wheel start spinnin' while youse >draggin'. Actually I guess it would prevent spinnin' until all four wheels >could burn... Turn the diff locks on and drive the car in a circle on tarmac and listen to the tyres !