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2019-2024
GMC Sierra
Rear BumperShellz™ Installation Guide

​Predicted Installation Time: 30-45 minutes

Items Included

• Side Covers:2
• Center Cover:1
• Preinstalled 3m Tape
• 1 Adhesion Promoter Packet

Tools Required

• Isopropyl Alcohol
• T-10 TORX bit
• T-30 TORX bit
​• Trim tool
​• Plastic pry tools
​
• Flat-head Screwdriver
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Before You Get Started...

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Warm surfaces and 3M tape with heat gun if ambient temperature is below 68 degrees F
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Any Modification or unintended use will void the manufacturers warranty
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A dry fit of all pieces must be performed before the final installation of the product to ensure fit
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Products cannot be returned for a full refund after the red backing to the 3M tape is removed

Paint Preparation Instructions Link

If you ordered the "Paintable" version, click on the instructions link above for paint prep, and trim installation instructions.

Preparation

  • If your bumper has any significant pre-existing dents, you may want to remove the bumper and try to pound some of these out.  Small dings and rust can usually be directly covered by BumperShellz™ if trim lines between plastic trim/step pad and exposed steel bumper are in their original shape.  A distorted bumper will negatively affect the fit of your BumperShellz™.
  • Ensure the bumper is clean.  After a quick wash, use Isopropyl alcohol or Acetone with a brand new, lint-free cloth to thoroughly clean the bumper.  For professional results, use 3M brand prep solvent 70, Adhesion Promoter 94, or a similar vinyl adhesion promoter product available at many auto stores.
  • It is critical to “Dry Fit” all parts before removing 3M tape to check for fitment and practice the installation method before the attachment is permanent. After the part is permanently installed, it will be much more difficult to make small alterations if needed, and the product cannot be returned for a complete refund.

​The degree to which you follow these preparation instructions will determine the quality of the installed product.  Please follow all instructions and be patient.  If you are unsure of any area of the installation after reading these instructions, please call us at 844-918-3688, and we will answer any questions that you have.

1. Remove 4 bumper bolts using T-30 Torx Bit on driver and passenger sides.





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2. Remove the plastic bumper protector trim piece around the edge of your rear bumper on either side if available.
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3. Remove Bumper Edge Step
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​3a. Pry up step pad on edge step with flat-head
3b. Remove 2 trim screws under step pad, and 3 on the top with T-10 TORX Bit
​3c. Release 3 clips on the bottom of the step using a flat-head screwdriver.
3d. Remove the step from the bumper. (NOTE) There are several different angles of attack you will need to use to unlatch the clips in step (3c) with your flat head. This may take additional time as you look for the best way to release them.
4. Begin performing your dry fit by completing the following steps without removing the red backing to the 3M tape. If you have a protective film preinstalled, you may wish to leave this on your BumperShellz during this portion and then remove it during your final install. 
5. Ensure the bumper is clean and free of debris. Use Isopropyl rubbing alcohol to free the bumper surface of any chemicals or soap residue that may limit the effectiveness of the 3M tape. Wipe the adhesion promoter towel along all areas of the bumper where the 3M tape will be contacting.
​6. Peel off the red backing to the 3M tape on each section right before installation. (Only after dry-fit)  

Installation

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7. Begin on either side by slipping the edge of the BumperShellz under the step pad.
​8. Continue tucking the top edge of the BumperShellz under the step pad around the corner towards the center of the bumper
9. When you are finished the entire top edge should be snugly tucked under the step pad. You may need to use your trim tool for certain portions of this step  
10. When you are finished the entire top edge should be snugly tucked under the step pad.  All clearance holes, including bumper bolt, and parking sensor clearance holes (if available) should be lined up appropriately.  Sensors should be centered within their respective clearance holes.  After you are satisfied that everything is positioned correctly, apply firm pressure to the areas where the 3M tape is attached.
​11. Repeat steps 6-10 on opposite side
​12. Install the center cover of the rear BumperShellz set. The top edge of this cover should slip under the step pad, overlapping the side covers by about ¼” on each side. Don’t allow the 3M tape to touch down until you are satisfied with the cover’s position.  When you are satisfied, apply firm pressure on all areas of the bumper cover where the 3M tape has been applied.
​13.  All the sections of the BumperShellz should now be fully installed.  Put firm pressure once again on all areas where the 3M tape is contacting the bumper to ensure proper adhesion. 
​14.  Reinstall the side step pad, and bumper bolts you removed at the beginning of this installation.
15.  If possible, wait at least 48 hours before engaging in highway driving, or using automated car washes.  Reapply pressure to all taped areas 24 hours after initial installation

Care for your BumperShellz™

Care for your BumperShellz™ like you would any fine paint finish.   Use high quality cleaning products designed specifically for car care.

Gloss finishes: Oftentimes, minor scratches can be buffed out on the gloss finishes.  Rubbing compounds can be used with a mechanical buffer, for deeper scratches.
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Matte finishes are much more susceptible to abrasions, leaving a "glossy sheen" on the finish, which are generally permanent.  Do not attempt to buff out scratches/abrasions on your matte finish, as this will generally make the damage worse.  Avoid excessive friction when trying to remove anything stuck to the matte finish surface and keep cleaning rags/water clean and abrasive free.  Abrasive brush-type car washes are not recommended, as they can abrade the Matte finish.  Brushless car washes are acceptable.

    Show off your truck, WIN a GAPSHIELD

    Send us your Before and After Pictures!  We will show off your truck to the world.  Plus, one winner will be randomly selected each month to receive a free GapShield!  If you'd like us to tag you on Instagram, please include your profile name.
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3860 Cincinnati Ave 
Rocklin , CA 95765
  • Home
  • Products
    • GapShield
    • AeroBox
    • BumperShellz
  • SALE ITEMS
  • New Model Request
    • 2024+F150 Early Interest Form
  • Become A Dealer
  • Contact Us
  • Installation Instructions Home
    • FORD MODEL YEAR SELECT
    • CHEVROLET MODEL YEAR SELECT >
      • 2007-2013 Silverado Installation Home
      • 2014-2015 Silverado Installation Home
      • 2016-2018 Silverado Installation Instructions Home
      • 2019-2021 Installation Home >
        • 2019-2021 Front Bumper Installation Home
      • 2023-2024 Installation Home >
        • 2023-2024 Front Bumper Installation Home
        • 2023-2024 Silverado Grille Installation Home
    • GMC MODEL YEAR SELECT >
      • 2007-2013 GMC Sierra Installations Home
      • 2014-2015 Sierra Installation Home
      • 2016-2018 Sierra Installation Home
      • 2019-2024 Sierra Installation Home
    • RAM MODEL YEAR SELECT >
      • 2009-2012 RAM Installation Configuration
      • 2013-2018 RAM Installation Configuration
    • TOYOTA MODEL YEAR SELECT >
      • Tundra Installation Configuration >
        • Tundra Installation Version Selector Page
  • Acrylic vs. Painted-to-Order
  • Painted Parts Policy
  • Paintable ABS Disclaimer
  • Toyota Tacoma New Product
  • Product Overview