Listen for noise from the IRD. Defective bearing usually whirr or vibrate but it’s difficult to diagnose due to the closeness of the gearbox if you don’t want an expensive strip down of both components, the usual route is to wait until the problem gets sufficiently noisy to locate it that’s not good engineering practice, but whether trouble is caught early or late, the cause for early repair is that a fault in the IRD can cause problems and additional expense further down the driveline.
Bearing were does lead to gear failure. Pinion gears tend tend to receive axial loading transmitted to or from the propshaft eventually wearing their supporting bearings. Bearing wear allows slight movement of the hypoid gears causing uneven wear in the teeth. There’s no particular problem here on the Freelander but, as with all transmissions, they should be used with an awareness of the loadings that might be imparted by unsympathetic driving, and their outcomes.
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