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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1159 (Manual Transmission - AISIN AY6) >> Repair Instructions - Off Vehicle >> Synchronizers Disassemble >> 1st/2nd, 3rd/4th Gear Synchronizer

1st/2nd, 3rd/4th Gear Synchronizer

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of 1st Gear Synchronizer Components
    GM1474821Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: When you service the synchronizers, retain them in the same order that they are removed. Keep the synchronizer components together and mark them to identify correct location.
  1. Remove the following components from the 1st/2nd gear synchronizer hub (115/117):
    • the 1st gear synchronizer inner cone (96)
    • the 1st gear synchronizer outer cone (97)
    • the 1st gear synchronizer outer blocking ring (98)
    • the 1st gear synchronizer outer blocking ring (98)
    • the 1st gear synchronizer outer cone (97)
    • the 1st gear synchronizer inner cone (96)
    2. Fig 2: Synchronizer Insert and Spring
    GM1921476Courtesy of GENERAL MOTORS CORP.
  2. Remove the synchronizer insert and spring from the synchronizer hub. Press the spring and slide the insert out.
    3. Fig 3: View Of 3rd/4th Gear Synchronizer Hub & Blocking Rings
    GM1474822Courtesy of GENERAL MOTORS CORP.
  3. Remove the following components from the 3rd/4th gear synchronizer hub (116/118):
    • the 4th gear blocking ring (121)
    • the 3rd gear blocking ring (104)
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