Mazda RX-8 Workshop Manual page 1527

5. Place the SST (49 8531 565) on top of the SST (49 0660 555).
6. Place the SST on the surface plate and set the dial gauge to zero.
7. Set the SSTs as shown in the figure.
8. Place the measuring probe of the dial gauge at the point where the side bearing is installed in the differential carrier and measure at
the lowest position. Measure the left and right sides.
9. Add the two (left and right) values obtained by the measurements taken in Step 8 and then divide the total by 2. From this sum,
subtract the sum of the number inscribed on the end of the drive pinion divided by 100. (If there is no figure inscribed, use 0.) This is the
pinion height adjustment value.
Differential pinion height
0.038 mm {0.0015 in} or less
NOTE:
When the values obtained by the measurements taken in Step 8, 9 are 0.06 mm {0.0024 in}, 0.04 mm {0.0016 in} and
the tip surface of the drive pinion value is 2, the formula is ((0.06+0.04)/2)-(2/100)=0.03. Therefore, assemble a spacer
0.03 mm {0.0012} thicker than the currently assembled one. The thickness settings are in increments of 0.015 mm
{0.0006}, so choose one closest in thickness and install.