If it is the catalytic converter thats failed, installing a new one without finding the reason for the failure will only result in another failed cat in a short time. The white smoke that you refer to indicates that perhaps you have a leaking head gasket which somewhat explains your other symptoms,and if the "white smoke' is coming from around the catalytic converter area, check that the catalytic converter doesn't have a crack or hole in it. Also, while your under there, have a look and see if the Cat C is discoloured, this indicates excessive heat caused by unburnt fuel burn in the cat. Also give it a decent belt with you hand (while it's cool of course) and see it there is a rattling sound. if there is, the material inside the Cat C has broken up and the cat needs replacing.
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No hand signals, driver playing with his transfer Knob.
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