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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 55 (Manual Transmission - NV 4500 - Overhaul) >> Repair Instructions >> Synchronizers Assemble (1st/2nd Speed Gear)

Synchronizers Assemble (1st/2nd Speed Gear)

WARNING: This page is about a different variant/trim than selected.
    IMPORTANT:
    • Only disassemble the synchronizer sleeve from the synchronizer hub if there is a suspected gear shift concern.
    • For installation alignment, scribe an alignment mark on the synchronizer hubs and synchronizer sleeves before disassembling.
    • Mark the synchronizers clutch gears and the blocking rings with the corresponding gear, for correct diagnostic inspections.
    • Install the synchronizer components in the same location, if reusing.
    Fig 1: Assembling Synchronizer - 1st/2nd Gear
    GM789425Courtesy of GENERAL MOTORS CORP.
  1. Lay the 1st/2nd speed gear assembly on the 1st speed gear synchronizer inner and middle rings. The rings will hold the hub up.
  2. Slide the synchronizer sleeve on the synchronizer hub.
    • Align the sleeve to the hub.
    • The sleeve will fit in only one direction on the hub.
    • The tapered side of the sleeve faces up, or toward second gear.
  3. Using a small screwdriver, install the 4 springs and the 4 inserts.
  4. Move the sleeve to the neutral position, to hold the springs and inserts in position.