Diagnostic Procedure
Confirm customer complaint of vibration/drone felt in the floorboard or seat between 55 - 75 mph by test driving the vehicle and note the speed range in which the vibration/drone occurs.^ Does the vibration/drone occur in the 55-65 mph range?
If YES - Go to Front Differential Damper Installation/Replacement in this TSIB.
If NO - go to next question.
^ Does the vibration/drone occur between 70-75 mph?
If YES - Go to Transfer Case Drive Chain Replacement/Transfer Case Dynamic Damper Installation in this TSIB.
If NO - This TSIB does NOT apply.