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 🢒 Air Shift Control Valve Replacement

Removal Procedure
  1. Exhaust all air pressure from the system.
  2. Remove the screw (2) from the transmission shift valve skirt.
  3. Slide the skirt (6) down the shift lever.
  4. Remove the air lines from the shift control valve.
  5. Cap the line openings.

    6. Object Number: 199835 Size: MH
  6. Perform the following steps in order to remove the shift control valve:
    7. 6.1. Loosen the nut (3).
    6.2. Unscrew the shift control valve (1).
    6.3. Slide off the skirt (6).

Installation Procedure

    Object Number: 199835 Size: MH
  1. Perform the following steps in order to install the shift control valve:
    2. 1.1. For Fuller RT6610 transmissions, slide the skirt onto the shift lever.
    1.2. Screw the shift control valve on all the way, then back until the valve lever or selector button points to the driver side of the cab (2).
    1.3. Tighten the nut against the shift control valve (3).
  2. Perform the following steps in order to install the air lines to the shift control valve (1):
    3. 2.1. Remove the caps.
    2.2. Screw the air lines onto the connectors from which they were removed.
  3. Slide the skirt onto the air shift control valve (6).

    4. Notice: Refer to Fastener Notice in the Preface section.

  4. Install the screw to the shift valve skirt.

    5. Tighten
    Tighten the skirt screw to 15 N·m (11 lb ft).

  5. Pressurize the air system.
  6. Operate the shift control valve to check for leaks.