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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 Assemble >> 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: Synchronizer Insert And Spring
    GM1921476Courtesy of GENERAL MOTORS CORP.
  1. Install the synchronizer insert and spring into the synchronizer hub. Press the spring and slide the insert in.
    2. Fig 2: 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.
  2. Apply lubricant to the cones and blocking rings. Align and install the following components into 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 outer blocking ring (98)
    • the 2nd gear outer blocking ring (98)
    • the 2nd gear synchronizer outer cone (97)
    • the 2nd gear synchronizer inner cone (96)
    3. Fig 3: View Of 3rd/4th Gear Synchronizer Hub & Blocking Rings
    GM1474822Courtesy of GENERAL MOTORS CORP.
  3. Apply lubricant to the blocking rings. Install the following components into the 3rd/4th gear synchronizer hub (116/118):
    • the 3rd gear blocking ring (104)
    • the 4th gear blocking ring (121)
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