Isuzu D-Max Diff Failure: Why the Open Carrier Gears Give Out
Has your D-Max developed a clunk or grind from the rear end? Here is what usually fails inside the open carrier, and what it takes to fix it properly.
The Isuzu D-Max shares its rear diff with the Holden Colorado RC, and both suffer from the same weak point: the spider gears in the open carrier. When one wheel spins on gravel or a wet boat ramp, the small gears take all the load and the thrust washers behind them wear through.
What you will notice
A clunk when you take up drive, a grinding noise on tight turns, or a diff that suddenly drives like it has no traction at all. If the carrier has already let go you may find metal in the oil.
The fix
A worn carrier is not something we patch up. The sensible repair is a rebuilt exchange diff with a new carrier, new bearings and fresh seals, or an upgrade to a limited slip centre if the ute spends time off the seal.
