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Home >> Chevrolet >> 2009 >> Corvette Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Manual Transmission - TREMEC 6-Speed) >> Repair Instructions - Off Vehicle >> Main Shaft and Input Shaft Disassemble >> Mainshaft

Main Shaft and Input Shaft Disassemble: Mainshaft

WARNING: This page is about a different variant/trim than selected.
    Fig 1: View Of Input Shaft and Mainshaft
    GM1887569Courtesy of GENERAL MOTORS CORP.
    NOTE: Measure the 4th speed gear synchronizer wear gap before disassembling the mainshaft.
  1. Install the input shaft in the adapter plate.
  2. Install the mainshaft on the input shaft.
  3. Using a feeler gauge measure the gap between the 4th speed gear blocking ring and the 4th speed gear.
  4. Replace the 4th speed gear friction cone and blocking ring when the gap is less than 1.27 mm (0.050 in).
    5. CAUTION: Do not overtighten the J 36513 split plate past the gear teeth or damage to gear may occur.
  5. Using the J 36513:  split plate, close the split plate only enough to support the gear teeth, and the J 39442:  adapter, remove the following parts in order:
    1. The 6th speed driven gear
    2. The mainshaft large tapered bearing
    3. The 1st speed gear
    4. The 1st speed gear caged needle bearing
    5. The 1st speed locking ring
    6. The 1st speed 2 piece thrust washer
    6. Fig 2: View Of 1st Speed Gear Inner Cone, Friction Cone & Blocking Ring
    GM1938370Courtesy of GENERAL MOTORS CORP.
  6. Remove the following parts in order:
    1. The 1st speed gear inner cone
    2. The 1st speed gear friction cone
    3. The 1st speed gear blocking ring
    7. Fig 3: View Of Alignment Marks On Synchronizer Hub & Synchronizer Sleeve
    GM4810Courtesy of GENERAL MOTORS CORP.
    NOTE: The synchronizer hubs and sliding sleeves are a selected assembly. Keep these parts together as originally assembled.
  7. Scribe a mark on the synchronizer hub and on the sleeve. This will help you to reinstall the parts in the same position.
    8. Fig 4: View Of 2nd Speed Gear, 1st/2nd Speed Synchronizer Assembly, Friction Cone & Inner Cone
    GM1938374Courtesy of GENERAL MOTORS CORP.
  8. Remove the 2nd speed gear. The 1st/2nd speed synchronizer assembly, the 2nd speed gear blocking ring, the 2nd speed gear friction cone, and the 2nd speed gear inner cone will press off with the 2nd speed gear. Use the J 36513:  split plate in an inverted position, J 39442:  adapter and a hydraulic press.
    9. Fig 5: View of 2nd Speed Gear Caged Needle Bearing & Spacer
    GM1938379Courtesy of GENERAL MOTORS CORP.
  9. Remove the 2nd speed gear spacer and caged needle bearing.
    10. Fig 6: View Of Mainshaft Small Tapered Bearing, Special Tools J 39442 & J 39443
    GM38328Courtesy of GENERAL MOTORS CORP.
  10. Remove the mainshaft small tapered bearing. Use the J 39442:  adapter, the J 39443:  split plate, and a hydraulic press.
  11. Discard the small tapered bearing.
    12. Fig 7: View Of 3rd/4th Synchronizer Retaining Ring
    GM1938384Courtesy of GENERAL MOTORS CORP.
  12. Remove the 3rd/4th synchronizer retaining ring.
    13. Fig 8: View Of Alignment Marks On Synchronizer Hub & Synchronizer Sleeve
    GM4810Courtesy of GENERAL MOTORS CORP.
    NOTE: The synchronizer hubs and sliding sleeves are a selected assembly. Keep these parts together as originally assembled.
  13. Scribe a mark on the synchronizer hub and on the sleeve. This will help you to reinstall the parts in the same position.
    14. Fig 9: View Of Special Tool J 39473v-Blocks & Hydraulic Press
    GM1938387Courtesy of GENERAL MOTORS CORP.
  14. Use the J 39473:  bearing installer, V-blocks, and a hydraulic press to remove the following components:
    • 3rd/4th speed synchronizer assembly
    • 3rd speed gear blocking ring
    • 3rd speed gear friction cone
    • 3rd speed gear inner cone
    • 3rd speed gear
    15. Fig 10: View of 3rd Speed Gear Caged Needle Bearing
    GM1938390Courtesy of GENERAL MOTORS CORP.
  15. Remove the spacer.
  16. Remove the 3rd speed gear caged needle bearing.
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