How to Install Amp Research Bedxtender HD Max - Silver on your Sierra

Use the M5 bolts and nuts to fasten the Quick Mount Bracket to the mounting bracket. Apply thread locker to the tip of the M5 bolt. Torque to 8 ft. lbs. Allow 10 minutes to dry before handling. (Passenger side shown) 

NOTE: Angle brackets may alread be installed onto brackets.

Remove the 2 Phillips screws that are holding the tail lights in place. Carefully pull back to remove tail lights.

Tape template to vehicle to locate upper hole of Mounting Bracket. Mark (Center Punch) & drill hole with 1/8” drill bit. Remove template and drill out hole with 21/64” drill bit. Use file to remove burrs. Apply primer to edge of hole. Repeat for other side.

Place Mounting Bracket aligned with top hole. Allow bracket to hang vertically. Mark (Center Punch) location of lower hole using the bracket slot as a template. Remove bracket. Drill hole with 1/8” drill bit then drill out hole with 21/64” drill bit. Use file to remove burrs. Apply primer to edge of hole. Allow primer to dry.

Assemble Mounting Bracket using the M8 bolts & nuts as shown. Tighten & torque to 22ft. lbs. Replace the tail light assembly. Repeat for other side.

Measure 7” from each end of the three center tubes and mark with tape. Tape is to be used as a reference point

Note: Template located on inside of box.

Slide 3 center tubes into the open ends of the bent tubes as shown. Insert center tube with logo into the center tube.

Connect the two halves. Make sure there is at least 3” overlap with the bent tubes on each side.

Adjust the width of the BEDXTENDER by placing the pivots into the mounting brackets. To keep overlap consant, adjust each tube so that the gap between the edge and the tape is the same.

Attach plastic upright around the tube juncture, placing rubber bumpers into the two ends of the upright.

NOTE: The inside of the upright is stepped to fit correctly around the small and large diameter tubes.

Tighten PT-Screws using a T-25 torx driver, starting in the middle of each upright, then the outer screws and lastly the remaining two to evenly tighten.

NOTE: Do not over tighten as this may strip out. 8 Fastener will reach a noticable stopping point.

Adjust Strap Buckles to lock into the tailgate when BEDXTENDER is deployed. Your assembly is now complete.

NOTE: Ensure that buckles are properly inserted into latches by pulling on the straps after both buckles have been inserted.