Have encountered problem when trying to engage 4WD system using small lever control on my 4.0L petrol motor PRADO . Basically the 4WD lever wont budge or move in any direction despite trying at different speeds and whilst stopped. Had clutch replaced approx 2 years ago and did not test 4WD at time nor used 4WD since. Any ideas?? VIN JTEBU29J000031801. Thanks Glenn (Sydney Australia)