Adjusting Shim Assembly Note

Assemble the differential carrier to the SSTs.
Assemble the spacer to the differential carrier.
Stack the side bearing outer race and gear case component on the surface plate as indicated in the figure, and measure the height using a caliper and a ruler. This is value A.

Fig 1: Measure Differential Carrier Height Using A Caliper And Ruler
Courtesy of MAZDA MOTORS CORP.
Measure the width of the installed differential in the differential carrier with the spacer installed. This is value B.
The combined thickness of the left and right adjusting shims is obtained by the following formula.
C ₁ = B - A + 0.15 mm {0.006 in}

C ₂ = B - A + 0.44 mm {0.017 in}
If the combined thickness of the previously installed adjusting shims is between C1 and C2, use the shims as they are.

Fig 2: Identifying Spacer And Value B
Courtesy of MAZDA MOTORS CORP.

If the combined thickness of the previously installed adjusting shims is not between C1 and C2, or if the adjusting shims have to be replaced, select two appropriate adjusting shims from the table below.

Adjusting shim thickness

ADJUSTING SHIM THICKNESS

Identification mark	Thickness (mm {in})	Identification mark	Thickness (mm {In})
350	3.50 {0.137}	410	4.10 {0.161}
355	3.55 {0.139}	415	4.15 {0.163}
360	3.60 {0.141}	420	4.20 {0.165}
365	3.65 {0.143}	425	4.25 {0.167}
370	3.70 {0.145}	430	4.30 {0.169}
375	3.75 {0.147}	435	4.35 {0.171}
380	3.80 {0.149}	440	4.40 {0.173}
385	3.85 {0.151}	445	4.45 {0.175}
390	3.90 {0.153}	450	4.50 {0.177}
395	3.95 {0.155}	455	4.55 {0.179}
400	4.00 {0.157}	460	4.60 {0.181}
405	4.05 {0.159}	-	-

CAUTION:

If adjusting shims are to be reused, do not mix up the left and right shims.
Do not mix up the left and right side bearing outer races and spacers.

Assemble the selected adjusting shims to the differential carrier ring gear side, and the spacer to the opposite side.
Assemble the differential and bearing outer race to the differential carrier.
Tap the selected adjusting shim between the spacer and the bearing race with a plastic hammer as shown in the figure.

Fig 3: Installing Adjusting Shims Between Spacer & Bearing Race

Courtesy of MAZDA MOTORS CORP.

Align the bearing cap alignment marks to assemble the bearing cap, and temporarily tighten the bolts.
Place the dial indicator so that the measuring probe contacts the top surface of one of the ring gear teeth perpendicularly.
Secure the drive pinion and measure the backlash from when the ring gear moved.
Rear differential backlash of drive pinion and ring gear

Standard: 0.09-0.11 mm {0.003-0.004 in}

Minimum value: 0.05 mm {0.002 in}
NOTE:
- Measure the backlash at 4 locations around the ring gear. Make sure one of the 4 locations is within specification, and the minimum value for the 4 locations is 0.5 mm {0.002 in} or less.
If the backlash is not within the specification, adjust the gear case component by moving it in the axial direction.
NOTE:
- When moving the gear case component in the axial direction, replace the adjusting shims. If the adjusting shim on the right side is replaced with one that is 0.05 mm {0.002 in} thicker, replace the one on the left with one that is 0.05 mm {0.002 in} thinner.