>>A<< Spacer, Side Gear, Washer, Pinion And Pinion Shaft, Pinion Shaft Holder, Lock Pin, Front Output Shaft, Snap Ring, Center Differential Flange, Installation

WARNING: This page is about a different car, the 2012 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.

Mount a spacer on the back surface of the side gear, and then install the side gear in the differential case.
NOTE: When a new side gear is to be installed, use a medium thickness spacer [1.58 to 1.62 mm (0.0623 to 0.0637 inch)].
Place the washers on the back of the pinions, and simultaneously mesh the four pieces with the side gears. Place them into position while rotating them. Then, install the pinion shaft holder.

Fig 1: Center Differential Case Side Gears
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Insert the pinion shaft.
Install the lock pin.

Fig 2: Center Differential Case Lock Pin
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Install the front output shaft on the side gear, and install the snap ring.
As shown in the illustration, mount a spacer on the back surface of the side gear after installing the side gear in the differential case.
NOTE: When a new side gear is to be installed, use a medium thickness spacer [1.58 to 1.62 mm (0.0623 to 0.0637 inch)].

Fig 3: Installing Spacer On Center differential
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Install the center differential flange by aligning the matching marks, and temporarily tighten the two machine screws.

Fig 4: Center Differential Flange
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Measure the backlash between the side gear and pinion. Standard value: 0.025 - 0.150 mm (0.0010 - 0.0059 inch)

Fig 5: Measuring Side Gear & Pinion Backlash
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
If the backlash is out of the standard value, select a spacer and re-measure the backlash.
NOTE: Adjust until the backlash on both sides are equal.