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How to Replace Wiper Transmission Arms 88-98 GMC Sierra K1500

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  1. step : Removing the Wiper Arms (0:58)
    • Mark your wiper blade position with painter's tape
    • Pry out the wiper arm tab with a flat blade screwdriver
    • Lift the wiper arm off the pivot
    • Repeat these steps for the other arm
  2. step : Removing the Wiper Cowl (1:45)
    • Peel the weatherstrip off the top of the firewall
    • Remove the three Phillips screws from each side of the cowl
    • Remove the two corner panels
    • Remove the fourth Phillips screw from each side of the cowl
    • Remove the four Phillips screws from the front of the cowl
    • Lift up the cowl
    • Disconnect the windshield washer hose
    • Remove the cowl from the vehicle
  3. step : Removing the Wiper Transmission (2:47)
    • Loosen the 10mm nuts on the wiper linkage
    • Pull the wiper linkage arms off the wiper motor stud
    • Remove the three 11mm bolts from the wiper transmission
    • Slide the transmission out of the truck
  4. step : Installing the Wiper Transmission (3:43)
    • Slide the transmission into place
    • Line up the transmission
    • Install the three 11mm bolts for the wiper transmission
    • Slide the wiper linkage arms onto the wiper motor stud
    • Tighten the 10mm nuts on the wiper linkage
  5. step : Installing the Cowl (4:24)
    • Connect the washer hose
    • Put the cowl into place
    • Install the four Phillips screws in the front of the cowl
    • Insert the first two screws on each side of the cowl
    • Put the corner panels into place
    • Install the remaining two screws on each side of the cowl
    • Push the weatherstrip into place
  6. step : Installing the Wiper Arms (5:22)
    • Slide the wiper arms onto the pivots
    • Lay the wiper blades down gently
    • Remove the painter's tape

Hi, I'm Mike from 1A Auto. We've been selling auto parts for over 30 years. We're dedicated to delivering quality auto parts, expert customer service, fast and free shipping, all backed by our 100% satisfaction guarantee. Visit us at, your trusted source for quality auto parts.

In this video, we're going to be working with our 1996 GMC Sierra K1500. We're going to show you how to remove and replace your vehicle's wiper transmission. This is actually two individual pieces in this vehicle, one for the passenger side and one for the driver's. We're going be to replacing the passenger side, but the process will be the same for the driver's. If you like this video, please click "subscribe." We have a ton more information on this truck as well as many other makes and models, and if you need these parts for your vehicle, you can follow the link down in the description over to Here are the items you'll need for this repair.

Use some small pieces of painters tape to make a straight line with your wiper blade. This will help us position the arms back on without needing to do trial and error. Using the flat blade screwdriver, pry out on the tab on the top edge of the wiper arm at the pivot. Remove the wiper arm from the pivot. Do the same thing on the opposite side.

Remove the weather strip from the top of the firewall. Remove the three Phillips-head screws securing the cowl to the truck on both sides. There's one down on this opening. There are three, both in the same positions on either side of the vehicle. Once you get the first three screws removed, lift up and remove this corner panel that goes around the hinge. There's a fourth Phillips-head screw under there you'll also need to remove. Remove the three screws from each corner of your cowl.

Once that's done, you can remove all four of the Phillips-head screws along the front of the cowl. Pull back and lift up to remove the cowl. You'll need to disconnect the washer hose over here on the driver's side. Remove the cowl from the vehicle.

Loosen the 10 millimeter nuts on the wiper linkage. There's no need to remove these entirely. If you're doing the driver’s side arm, you can stop here and move on to removing the other portion on the other end of the arm. However, for the passenger side, you'll need to loosen this.

Remove the three 11 millimeter bolts securing the pivot end of the wiper transmission to the truck. Lower the pivot into the cowl. Slide it up and out of the next opening.

Send the arm back into the truck. Line up the pivot and the three holes and reinstall your three 11 millimeter screws.

Snap the arms back on to the wiper, tighten them back down with your 10 millimeter socket and ratchet. Make sure they're in the same place they were removed from.

Reconnect your windshield washer hose, and lay the cowl back into place. Reinstall the four screws in the center section of the cowl. Reinstall the two short screws on the end. Once the rear one's in, you can reinstall the plastic cover. It simply slides in and drops down. Reinstall the longer screw on the outer edge here. Repeat these steps on the opposite side. Reinstall the weather strip onto the top edge of the cowl.

Now, I know we had mentioned using the painters tape to align these earlier, but it turns out these wipers are keyed, which means they'll only go on one way. Simply pull out the tab and slide them back on. Lock the tab back into place. Lay the wiper down. Remove the tape.

Thanks for watching. Visit us at for quality auto parts, fast and free shipping, and the best customer service in the industry.

Tools needed for replacement:

    Materials, Fluids, and Supplies

  • Painter's Tape

  • Ratchets & Related

  • Ratchet
  • Socket Extensions

  • Screwdrivers & Related

  • Phillips Head Screwdriver
  • Flat Blade Screwdriver

  • Sockets - Metric

  • 11mm Socket
  • 10mm Socket

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