Main Shaft Assembly for Single-Range: Installation

Install the needle bearing and oil seal to the front of the transmission single-range main shaft assembly.
NOTE:
- Wrap the clutch splined section with vinyl tape to prevent damage to the oil seal.
- Apply NICHIMOLY N-130 or the equivalent to the sealing lip of the oil seal.
- Use a new oil seal.
Rotate the reverse idler gear by two teeth from free status in the direction of the arrow to make it engage with the main shaft reverse gear and install the main shaft assembly.
1. When the reverse idler sub gear is at free status, put alignment marks on reverse idler sub gear and reverse idler gear.
2. Rotate the alignment mark on the reverse idler sub gear side in the arrow direction by two teeth, and secure it with a wire.
  
  Fig 1: Rotating Alignment Mark On Reverse Idler Sub Gear Side By Two Teeth
  Courtesy of SUBARU OF AMERICA, INC.
Fit the transmission case knock pin to the knock pin hole of the needle bearing outer race and install the main shaft assembly.
NOTE:
- Align the end face of the seal with surface (A) when installing the oil seal.
  
  Fig 2: Identifying Seal End Face Alignment Surface
  Courtesy of SUBARU OF AMERICA, INC.
- Face the cutout portion of the snap ring for the double taper roller bearing to the drive pinion shaft assembly.
  
  Fig 3: Identifying Snap Ring
  Courtesy of SUBARU OF AMERICA, INC.
After installing the main shaft, check that the reverse idler gear and reverse idler sub gear are misaligned by two teeth and remove the wire.
Install the drive pinion shaft assembly. Refer to INSTALLATION .
Check each shift fork. Refer to INSPECTION .
Select a main shaft rear plate. Refer to MAIN SHAFT ASSEMBLY FOR SINGLE-RANGE .
Install the transmission case. Refer to INSTALLATION .
Install the transfer case together with the extension case assembly. Refer to INSTALLATION .
Install the manual transmission assembly to the vehicle. Refer to INSTALLATION .