How To Fix A Sagging 94-04 Mustang Window

Tools Needed

• Window Support Brace Kit
• Phillips or Flathead screwdriver depending on screws used (Magnetic Tip Screwdriver optional, but recommended)
• Harness Clip Removal Tool
• Small Pick or Allen wrench
• Microfiber Towel
• Cutting Pliers

Installation Instructions

1. First you will need to remove the door panel on the side that you wish to fix. Check our other video explaining the steps to get this removed.


2. You will then need to remove the hardware that secures the speaker to the door with a screwdriver.


3. Disconnect the electrical connection or spade connectors from the speaker and set aside.


4. Dislodge all the harness clips from the door frame.


5. Disconnect the power mirror electrical connection.


6. Carefully remove the moisture barrier from the door frame and set aside with the sticky side facing up.
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7. Roll the window all the way down and adjust up until you can access each bracket. Note: once adjusted make sure key is in off position just in case you accidentally hit the button.


8. Now remove any silicone adhesive that might have bled into the lower holes of each bracket as well as any silicone that is on the surface where the brace will NEED to seat flush against each bracket.


9. The braces we sell are raw steel so you do have the option to prep and paint with a rust preventive paint. In this video we have done so and numbered them to better help you with the install.


10. Please make sure the orientation of the brace is with the offset facing upwards.


11. In this video we have provided a letter and number system starting in alphabetical and numerical order starting from the rear of the door. It will be numbered 1-8 and A-C.


12. Hole locations 1 and 2 on bracket A are accessed through the large opening at the rear of the door.


13. Hole 3 on bracket B is accessed through the rectangular opening at the bottom of the door.


14. Holes 4 and 5 on bracket B are accessed through the circular opening just behind the door handle assembly. Note: Hole 4 is tricky to get to because of the angle.


15. Hole 6 can’t be accessed with the door glass in the car.


16. Hole 7 on bracket C can only be used if you remove the door handle assembly. This requires you to drill out a pop rivet and slide the assembly toward the side mirror. Now one of the small openings can be used to access hole 7. This step is OPTIONAL.


17. Hole 8 on bracket C is accessed through the small rectangular opening where the window motor electrical harness is located.


18. Now we can finally prep the braces for install. Starting with a blunt nose screw and screw into holes 3 through 8 on both brackets.


19. Now is a good time to clean any dirty brackets and we recommend to leave any old silicone in place to act as a cushion for the glass.


20. Position the support brace behind bracket C and use 2 screws to secure the brace to the bracket.NOTE: There will be different scenarios per vehicle for example, if your front bracket is separated (or very loose) remove it from the door and attach it to the brace while on the bench.


21. Feed the brace and bracket through the large opening.


22. Seat the glass into the bracket and make sure the plastic guide is positioned into the metal channel near the speaker opening.


23. Align hole 1 and slide a small zip tie through the back and install another zip tie and run it down until it’s loosely tightened. This will help hold the brace all while allowing the brace to have movement while installing the other screws.


24. Bring the window up to the circular opening and install a screw into hole 5 and fully tighten. Also, at this point if you can install the screw into hole 4, we recommend doing it now.


25. Loosely install a screw into slotted hole 2.


26. Bring the window down to the bottom rectangular opening and install and tighten the screw to hole 3.


27. Now you can position the window to access bracket A and you can also remove the zip tie from earlier so that you can install the screw into hole 1. Also fully tighten the screw in hole 2.


28. Now the window should be able to go completely up and down!


29. Also make sure no part of the window will make contact with the A-pillar.


30. Note: If someone has adjusted the glass before to compensate for this problem, make note of the vertical stop adjustment locations. These are 11 mm bolts and can be moved up or down. Also, in order for the adjustments to be made the window needs to be free of the stops so roll it down a few inches.




31. Once you triple check everything, you can now reinstall the moisture barrier, speaker, reconnect the power mirror switch, and finally reinstall the door panel.


32. Also be aware that every install is a little unique so you might have to do some adjustments depending on your situation.




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That’s it! We hope you enjoyed our step-by-step install as well as watching our video at the beginning of this article.


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