Nissan Navara: D40 Transfer Case Chain Rattle and 4WD Engagement Failure

The D40 Navara uses a part-time 4WD system with a dial-selected transfer case (2H, 4H, 4L). The internal drive chain and its tensioner are known to wear prematurely, especially if the transfer case oil is not changed at the recommended interval. Chain wear produces a characteristic rattle or whirring noise and can eventually cause slipping during 4WD engagement or failure to lock into 4H/4L modes.

• Metallic rattling or whirring noise from centre of vehicle at highway speeds in Auto or 4H mode
• 4WD engagement lamp flashing or failing to illuminate when 4H or 4L is selected
• Shudder or vibration through the drivetrain on tight low-speed turns in 4WD
• Transfer case oil contaminated with fine metal particles on drain inspection

With the vehicle in neutral and engine at idle, engage 4WD modes sequentially and listen for chain rattle or mechanical whirring. Road test in a straight line in 4H on a low-traction surface (grass or gravel) and confirm drive is being sent to all four wheels. Check transfer case oil level and condition — milky or metallic-flecked oil indicates internal wear.

Parts involved: Transfer case.

≈A$1,660 to ≈A$4,140 at independent workshop rates, shown as an approximate guide in Australian dollars. That is for this job on its own, not for the car.

An estimate, converted to Australian dollars, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

• “Has the transfer case oil ever been changed, and at what intervals?”
• “Does the 4WD system engage cleanly into 4H and 4L without any warning lights or delay?”
• “Has any drivetrain rattle or vibration been investigated or repaired?”

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.