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(W)
INSTALLATION INSTRUCTIONS
4" OVAL SIDEBARS WITH BENT ENDS
1999-2012 SILVERADO/SIERRA EXTRA CAB
PART # DZ 371527/DZ 371529
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4" OVAL SIDEBARS WITH BENT ENDS
1999-2012 SILVERADO/SIERRA EXTRA CAB
Page 1 of 4 4/11/12 Rev2 (DP)
IMPORTANT ALERT: GM uses a very strong thread-locking compound on all
body bolts. Use of an air assisted impact ratchet can cause damage to the
threads on factory body mount bolts and the internal nut assembly because of
this thread locking compound.
We only recommend the use of hand tools to slowly remove and reinstall body
mount bolts on all GM vehicles.
PROCEDURE:
CRITICAL INFORMATION: If during the removal process, it becomes increasingly
difficult to unscrew the body mount bolt with hand tools, tighten the bolt several
rotations to clear the thread locking compound from the threads, then reverse
direction and continue to unscrew until the body mount bolt is out. Repeat this
process as necessary on all GM body mount bolts. Use of an appropriate antiseize compound is highly recommended for re-installation. Tighten body mount
bolt to factory torque specifications for your particular model year.
Example of GM factory body mount bolt
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4" OVAL SIDEBARS WITH BENT ENDS
1999-2012 SILVERADO/SIERRA EXTRA CAB
Page 2 of 4 4/11/12 Rev2 (DP)
PARTS LIST:
1
Driver/Left Sidebar
4
1/2” x 2” Hex Bolts
1
Passenger/Right Sidebar
4
1/2” Lock Washers
1
Driver Side/Left Front Mounting Bracket
4
1/2” ID x 1-1/2" OD x 1/8" Flat Washers
1
Passenger Side/Right Front Mounting Bracket
2
10-1.50mm x 25mm Hex Bolts
2
Center Mounting Brackets
2
10mm Lock Washers
1
Driver Side/Left Rear Mounting Bracket
2
10mm ID x 20mm OD x 2mm Flat Washers
1
Passenger Side/Right Rear Mounting Bracket
PROCEDURE:
REMOVE CONTENTS FROM BOX. VERIFY ALL PARTS ARE PRESENT. READ "FACTORY
BODY BOLT REMOVAL INSTRUCTIONS" AND INSTALLATION INSTRUCTIONS
CAREFULLY BEFORE STARTING INSTALLATION. ASSISTANCE IS RECOMMENDED.
1. Start installation on the front, driver side of the vehicle. Remove the driver side front body
mount bolt, (Figure 1).
2. Select the driver side front Mounting Bracket. Insert the factory body mount bolt through the
Mounting Bracket and into the steel washer, (if equipped), and rubber bushing. Hang the
Mounting Bracket in position by partially threading the factory body mount bolt up into place,
(Figure 2). Snug but do not tighten hardware at this time.
VERY IMPORTANT! There are several different designs, (depending on model year),
for the factory steel body mount bracket. The front Sidebar Mounting Brackets can be
switched, driver side to passenger side, to provide additional clearance between the
gusset on the Mounting Bracket and the factory steel body mount bracket welded to the
frame. To prevent unnecessary noise, adjust the position of ALL Mounting
Brackets so that the Brackets do not come in contact with the factory steel body
mount bracket.
3. Repeat Step1 & 2 for Center and Rear Mounting Bracket installation, (Figures 3 & 4).
Driver/Left
rear Mounting
Bracket
Driver/Left front
Mounting Bracket
(2) Center Mounting
Brackets
Passenger/Right front
Mounting Bracket
Passenger/Right
rear Mounting
Bracket
Front
Driver/Left Sidebar illustrated. Arrow
indicates location of threaded insert
for Center Bracket
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4" OVAL SIDEBARS WITH BENT ENDS
1999-2012 SILVERADO/SIERRA EXTRA CAB
Page 3 of 4 4/11/12 Rev2 (DP)
4. With assistance, position the Sidebar up to the (3) loose Mounting Brackets. Attach the
Sidebar to the front and rear Mounting Brackets with the included (2) 1/2” x 2” Hex Bolts, (2)
1/2” Flat Washers and (2) 1/2” Lock Washers, (Figures 2 & 4). Do not tighten hardware at this
time.
5. Attach the center Mounting Bracket to the Sidebar with the included (1) 10-1.50mm x 25mm
Hex Bolt, (1) 10mm Flat Washer and (1) 10mm Lock Washer, (Figure 3). Do not tighten
hardware at this time.
6. Level and adjust the Sidebar, tighten all hardware. Check all mounting locations for clearance
between factory steel body mount brackets and Mounting Brackets. Once satisfied with fit,
tighten all hardware.
7. Repeat Steps 1 - 6 for passenger Sidebar installation.
8. Do periodic inspections to the installation to make sure that all hardware is secure and tight.
To protect your investment, wax this product after installing. Regular waxing is recommended to
add a protective layer over the finish. Do not use any type of polish or wax that may contain abrasives
that could damage the finish.
For stainless steel: Aluminum polish may be used to polish small scratches and scuffs on the finish.
Mild soap may be used also to clean the Sidebar.
For gloss black finishes: Mild soap may be used to clean the Sidebar.
Driver side installation pictured
(Fig 1) Front Mounting Location
Factory hex bolt
Front
Fig 2
Factory welded steel body mount bracket
1/2” x 2” Hex Bolt
1/2” Lock Washer
1/2” Flat Washer
Front
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4" OVAL SIDEBARS WITH BENT ENDS
1999-2012 SILVERADO/SIERRA EXTRA CAB
Page 4 of 4 4/11/12 Rev2 (DP)
Driver side installation pictured
1/2” x 2” Hex Bolt
1/2” Lock Washer
1/2” Flat Washer
10mm x 25mm Hex Bolt
10mm Lock Washer
10mm Flat Washer
(Fig 3) Center Mounting Location
Front
Factory hex bolt
(Fig 4) Rear Mounting Location
Rear
Complete Installation
Factory hex bolt
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