Rear axle assembly is a hypoid, semi-floating type which enables the outer rear wheel to rotate at a higher rate than the inner wheel whenever cornering and axleshafts which are splined to the differential side gears contribute to this differential action. A 9-0-2 Limited Slip Rear Axle is available as an option which uses multi-disc clutch packs to bring the rotation speed of the axleshafts near to standard when one wheel has maximum slip. On the 4WD models, for the front axle assembly, there is a differential and driveaxles with Constant Velocity (CV) joints; the right side is an extension axleshaft due to the offset differential. This is why it's unwise to conclude an axle issue just yet, since such a racket can hide many other problems; road noise does not increase with power, tire noise might be caused by wear or low pressure, and if an axle still sounds noisy in Neutral, one has to assume it's the engine or transmission instead. Since proper overhauling of the differential requires some special tools, it is impossible for a do it yourself person to do it and tasks such as the axleshaft, oil seal, and bearing should be left with a qualified workstation.