• 2011-2018MY Isuzu N-Series Vehicles

Equipped with 5.2L (4HK1) Diesel Engine and Limited Slip Differential (LSD) option code IV0

Customers of N-series vehicles may hear an audible clicking or chattering noise coming from the rear of the vehicle while making tight turns. This condition may be due to incorrect axle fluid installed at the last scheduled maintenance or during a previous repair. The condition can also result from delayed or skipped maintenance resulting in degradation of axle fluid.
See Figures 1 and 2 below to identify a limited slip differential or check the vehicle RPO codes for Option Code IV0.

To resolve this problem, follow the listed procedure:

1. Replace the differential gear oil with a commercially-available gear oil (SAE90 GL-5) in addition to 20oz of limited slip differential lubricant additive (P/N 8-01052-358-0 (quantity of five (5), 4oz bottles).

2. Road test the vehicle for at least 10 miles by making eight to ten tight left and right turns, such as going around a corner, to ensure the limited slip is activated.

3. If the condition persists, it may be necessary for tear down and inspection, degraded oil may have caused lubrication failure and component replacement may be necessary.