GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2008 🢒 TopKick C-Series (Conventional) C4/C5 🢒 Transmission/Transaxle 🢒 Manual Transmission - Medium Duty 🢒 Vehicle Speed Sensor Replacement

Removal Procedure

    Object Number: 790997 Size: SH
  1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. If equipped with the Eaton® Fuller® RT6609 9 speed transmission, disconnect the vehicle speed sensor (VSS) electrical connector (3).

    3. Object Number: 791220 Size: SH
  3. If equipped with the Spicer® ES52-7B or ES066-7B 7 speed transmissions, disconnect the VSS electrical connector (3).

    4. Object Number: 791222 Size: SH
  4. If equipped with the Eaton® Fuller® RT8709 9 speed, or RT8908LL 10 speed transmissions, disconnect the VSS electrical connector (2).

    5. Object Number: 791224 Size: SH
  5. If equipped with one of the following Eaton® Fuller® transmissions, and regular production option (RPO) JE3 disconnect the VSS electrical connector (3), or if equipped with RPO JE4 disconnect the VSS electrical connector (2).
    6. • 5 speed:
       - FS-4205A/B
       - FS-5205A/B
       - FS-6305A/B
    • 6 speed:
       - FS-5406A
       - FS-6406A
       - FSO-8406A

    Object Number: 791221 Size: SH
  6. If equipped with the Eaton® Fuller® FS Series transmission, disconnect the VSS electrical connector (2).
  7. Remove the VSS.

Installation Procedure

Important: A NEW VSS has pre-applied thread sealant on the threads.

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 791221 Size: SH
  1. If installing the old VSS, apply thread sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the threads.
  2. Install the VSS.

    3. Tighten
    Tighten the VSS to 48 N·m (35 lb ft).

  3. If equipped with the Eaton® Fuller® FS Series transmission, connect the VSS electrical connector (2).

    4. Object Number: 791224 Size: SH
  4. If equipped with one of the following Eaton® Fuller® transmissions, and RPO JE3 disconnect the VSS electrical connector (3), or if equipped with RPO JE4 disconnect the VSS electrical connector (2).
    5. • 5 speed:
       - FS-4205A/B
       - FS-5205A/B
       - FS-6305A/B
    • 6 speed:
       - FS-5406A
       - FS-6406A
       - FSO-8406A

    Object Number: 791222 Size: SH
  5. If equipped with the Eaton® Fuller® RT8709 9 speed, or RT8908LL 10 speed transmissions, connect the VSS electrical connector (2).

    6. Object Number: 791220 Size: SH
  6. If equipped with the Spicer® ES52-7B or ES066-7B 7 speed transmissions, connect the VSS electrical connector (3).

    7. Object Number: 790997 Size: SH
  7. If equipped with the Eaton® Fuller® RT6609 9 speed transmission, connect the VSS electrical connector (3).
  8. Lower the vehicle.