1983-2005 Chevy Blazer S10 4WD Vacuum Shift Actuator

This part replaces:

  • DORMAN 600-102
  • OE # 25031740

  • New

This Chevy front axle vacuum operated 4x4 4WD shift actuator is a new aftermarket replacement part. It is designed to replace your original, defective unit.


  • Mounts underneath battery tray
  • Attaches to differential shift cable
  • Replaces dealer part number: 25031740
  • Vacuum operated
  • Durable construction shift actuator
  • Direct bolt on
  • Replaces a leaking or corroded actuator

Note: If you have any questions about this shift actuator fitting your application, please call your local GM dealer with the above part number.

This vacuum operated actuator is built to strict quality control standards and has good cost savings of a dealer actuator.

Lifetime Warranty

Effective June 23, 2014: This item is backed by a manufacturer's Limited Lifetime Warranty. In the event this item should fail due to manufacturing defects during intended use, we will exchange the part free of charge (excludes shipping charges) for the original purchaser. Please keep your invoice for proof of this warranty.

  1. Removing the Battery
    • Use an 8mm wrench to disconnect the negative battery cable
    • Use an 8mm wrench to disconnect the positive battery cable
    • Remove the 13mm battery mounting bolt
    • Remove the battery mount
    • Remove the 13mm bolts that connect the battery tray to the radiator support
    • Pull out the battery tray
  2. Disconnecting the Vacuum Actuator Cable
    • Pull off the wire clip
    • Disconnect the cable
  3. Removing the Vacuum Actuator
    • Remove the two 13mm bolts from the wheel well bracket
    • Remove the vacuum actuator cable from the bracket
    • Remove the 7mm bolts from the bracket
    • Separate the vacuum actuator from the bracket
  4. Installing the New Vacuum Actuator
    • Attach the new actuator to the bracket
    • Tighten the 7mm bolts
    • Thread the 13mm bracket bolts through the wheel well and bracket
    • Tighten the 13mm bolt
    • Connect the cable to the actuator
    • Lock the cable into the cable bracket with a flat head screwdriver
  5. Reattaching the Battery
    • If the battery tray clip has fallen into the engine bay, remove the headlight
    • Retrieve the battery tray clip with an extendable magnet
    • Put the headlight back into place
    • Put the tray clip into place
    • Put the battery tray into place, front first
    • Then slide the rear bolt hole over the bolt
    • Insert the two 13mm bolts into the radiator support
    • Putt the battery on the tray
    • Put the battery mount in place
    • Tighten the 13mm battery mounting bolt
    • Reconnect the positive battery cable
    • Reconnect the negative battery cable

How-to Video:

(09:03 min)

Tools List:

    Pliers, Cutters & misc Wrenches

  • Slip-Joint Pliers

  • Ratchets & Related

  • Ratchet
  • Socket Extensions

  • Screwdrivers & Related

  • Flat Blade Screwdriver

  • Sockets - Metric

  • 13mm Socket
  • 7mm Socket
  • 8mm Socket

  • Sockets - SAE

  • 1/4 Inch Socket

  • Specialty Tools

  • Telescope magnet

  • Wrenches - Metric

  • 8mm Wrench

This part replaces:

  • DORMAN 600-102
  • OE # 25031740

Vehicle Fit

  • 1983-2005 Chevy Blazer S10 4WD Vacuum Shift Actuator
  • 1983-2004 Chevy S10 Pickup 4WD Vacuum Shift Actuator
  • 1998-2000 GMC Envoy 4WD Vacuum Shift Actuator
  • 1983-2001 GMC Jimmy S-15 4WD Vacuum Shift Actuator
  • 1983-1990 GMC S-15 Pickup 4WD Vacuum Shift Actuator
  • 1991-2004 GMC S-15 Sonoma 4WD Vacuum Shift Actuator
  • 1991 GMC Syclone 4WD Vacuum Shift Actuator
  • 1992-1993 GMC Typhoon 4WD Vacuum Shift Actuator
  • 1991-1994 Olds Bravada 4WD Vacuum Shift Actuator
  • 1996-2001 Olds Bravada 4WD Vacuum Shift Actuator
Part #: 1AFWA00002

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