Gear, Washer, Shaft And Case

WARNING: This page is about a different car, the 2004 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.

Check mating surfaces of differential case, side gears and pinion mate gears.
Check washers for wear.

Fig 1: Checking Items For Wear
Courtesy of NISSAN MOTOR CO., U.S.A.