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Home >> Subaru >> 2021 >> WRX Base >> Repair and Diagnosis >> Transmission >> Manual Trans >> Manual Transaxle & Differential (TY751) >> Main Shaft Assembly >> Installation

Main Shaft Assembly: Installation

  1. Attach the needle bearing and oil seal to the front of the 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.
  2. Rotate the reverse idler sub gear by two teeth from free status in the direction of the arrow to make it engage with the reverse gear of the main shaft 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.
      G13647780Courtesy of SUBARU OF AMERICA, INC.
  3. 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.
      G08548698Courtesy of SUBARU OF AMERICA, INC.
    • Face the cut-out portion of the snap ring for the double taper roller bearing to the drive pinion shaft assembly.
      G08582037Courtesy of SUBARU OF AMERICA, INC.
  4. 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.
  5. Install the drive pinion shaft assembly. Refer to MANUAL TRANSMISSION AND DIFFERENTIAL(6MT) (TY75)>DRIVE PINION SHAFT ASSEMBLY>INSTALLATION .
  6. Check each shifter fork. Refer to MANUAL TRANSMISSION AND DIFFERENTIAL(6MT) (TY75)>SHIFTER FORK AND ROD>INSPECTION .
  7. Select a main shaft rear plate. Refer to MANUAL TRANSMISSION AND DIFFERENTIAL(6MT) (TY75)>MAIN SHAFT ASSEMBLY>ADJUSTMENT .
  8. Install the transmission case. Refer to MANUAL TRANSMISSION AND DIFFERENTIAL(6MT) (TY75)>TRANSMISSION CASE>INSTALLATION .
  9. Install the transfer case together with the extension case assembly. Refer to MANUAL TRANSMISSION AND DIFFERENTIAL(6MT) (TY75)>TRANSFER CASE AND EXTENSION CASE ASSEMBLY>INSTALLATION .
  10. Install the manual transmission assembly to the vehicle. Refer to MANUAL TRANSMISSION AND DIFFERENTIAL(6MT) (TY75)>MANUAL TRANSMISSION ASSEMBLY>INSTALLATION .
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