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Home >> Subaru >> 2021 >> WRX STI >> Repair and Diagnosis >> Transmission >> Manual Trans >> Manual Transaxle & Differential (TY856) >> Main Shaft Assembly >> Removal

Main Shaft Assembly: Removal

  1. Remove the manual transmission assembly from the vehicle. Refer to MANUAL TRANSMISSION AND DIFFERENTIAL(6MT) (TY85)>MANUAL TRANSMISSION ASSEMBLY>REMOVAL .
  2. Prepare the transmission for overhaul. Refer to MANUAL TRANSMISSION AND DIFFERENTIAL(6MT) (TY85)>PREPARATION FOR OVERHAUL .
  3. Remove the neutral position switch, back-up light switch and harness. Refer to MANUAL TRANSMISSION AND DIFFERENTIAL(6MT) (TY85)>NEUTRAL POSITION SWITCH>REMOVAL . Refer to MANUAL TRANSMISSION AND DIFFERENTIAL(6MT) (TY85)>BACK-UP LIGHT SWITCH>REMOVAL .
  4. Remove the extension case. Refer to MANUAL TRANSMISSION AND DIFFERENTIAL(6MT) (TY85)>EXTENSION CASE>REMOVAL .
  5. Remove the transfer driven gear. Refer to MANUAL TRANSMISSION AND DIFFERENTIAL(6MT) (TY85)>TRANSFER DRIVEN GEAR>REMOVAL .
  6. Remove the center differential. Refer to MANUAL TRANSMISSION AND DIFFERENTIAL(6MT) (TY85)>CENTER DIFFERENTIAL>REMOVAL .
  7. Remove the transmission case. Refer to MANUAL TRANSMISSION AND DIFFERENTIAL(6MT) (TY85)>TRANSMISSION CASE>REMOVAL .
  8. Remove the striking rod.
  9. Remove the oil guide B.
    G05669463Courtesy of SUBARU OF AMERICA, INC.
  10. Use a screwdriver to shift to the 4th gear position.
    G13648098Courtesy of SUBARU OF AMERICA, INC.
  11. Remove the reverse idler holder.
    G13648099Courtesy of SUBARU OF AMERICA, INC.
  12. Remove the check plug, O-ring, check ball spring, shift accent plunger and check ball from the adapter plate.
    NOTE: Do not reuse the O-ring.
    G13648100Courtesy of SUBARU OF AMERICA, INC.
  13. Remove the bolt and gasket holding the reverse idler gear shaft.
    G05003369Courtesy of SUBARU OF AMERICA, INC.
  14. Push the main shaft assembly, driven gear assembly, reverse idler gear and shifter forks to remove from the adapter plate all at once.
    NOTE: A helper is required to perform this work.