This new transfer case switch is a high quality, value priced, aftermarket replacement part.

If defective, your shift light will not indicate 4WD when shifted to 4WD. Why search through junk yards hoping to find a used 4x4 vacuum switch when you can have it brand new! Replace that defective transfer case switch now.


  • Vacuum operated
  • Replaces dealer part number: 15664811
  • Direct bolt on
  • Fits 4 wheel drive trucks
  • Built to strict quality control standards

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

This 4x4 GM vacuum switch has substantial cost savings over a dealer unit.

Lifetime Warranty

This item is backed by a 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.

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Vehicle Fit

  • 1983-2000 Chevy Blazer S10 Transfer Case Vacuum Switch
  • 1983-2000 Chevy S10 Pickup Transfer Case Vacuum Switch
  • 1983-2000 GMC Jimmy S-15 Transfer Case Vacuum Switch
  • 1983-1990 GMC S-15 Pickup Transfer Case Vacuum Switch
  • 1991-2000 GMC S-15 Sonoma Transfer Case Vacuum Switch
  • 1991-2000 Olds Bravada Transfer Case Vacuum Switch

This part replaces:

  • OE # 15664811
  • OE # 89059420
  • Dorman 49315
Part #: 1AFWM00004

Ships Same Day for orders placed by 4 P.M. ET