Westin 57-3990 User manual

1
Thank You for choosing Westin products
For Additional installation assistance please call
Customer service [phone]
www.westinautomotive.com
P.N.: 75-57399-RevA ECO #: W19-0195 DATE: 11/26/19
Westin Automotive Products, Inc.
320 W. Covina Blvd
San Dimas, Ca. 91773
ITEM QUANTITY DESCRIPTION TOOLS NEEDED
11GRILLE GUARD RATCHET
21LOWER DRIVER MOUNTING BRACKET 16mm SOCKET
31LOWER PASSENGER MOUNTING BRACKET 17mm SOCKET
41DRIVER INSIDE SUPPORT BRACKET 18mm SOCKET
51PASSENGER INSIDE SUPPORT BRACKET 16mm WRENCH
61DRIVER UPPER STRAP 17mm WRENCH
71PASSENGER UPPER STRAP 18mm WRENCH
82SHORT M12 HEX HEAD BOLT (YELLOW ZINC) TORQUE WRENCH
94LONG M12 HEX HAD BOLT (YELLOW ZINC) CUTTING TOOL
10 6M12 SPLIT LOCK WASHER (YELLOW ZINC)
11 12 M12 FLAT WASHER (YELLOW ZINC)
12 6M12 HEX NUT (YELLOW ZINC)
13 2M10 BUTTON HEAD BOLT (BLACK ZINC)
14 2M10 BELLVILLE WASHER (BLACK ZINC)
15 2M10 SERRATED FLANGE NUT (BLACK ZINC)
16 6M12 BUTTON HEAD BOLT (BLACK ZINC)
17 6M12 SERRATED FLANGE NUT (BLACK ZINC)
18 6M12 BELLVILLE WASHER
ANTI-SEIZE LUBRICANT MUST BE USED ON ALL STAINLESS STEEL FASTENERS TO PREVENT THREAD DAMAGE AND GALLING.
INSTALLATION INSTRUCTIONS
HDX Grille Guard
APPLICATION:
2020 Chevrolet Silverado 2500/3500
PART NUMBER:
57-3990, 57-3995
ITEM 2 ITEM 3ITEM 1

2
Thank You for choosing Westin products
For Additional installation assistance please call
Customer service [phone]
www.westinautomotive.com
P.N.: 75-57399-RevA ECO #: W19-0195 DATE: 11/26/19
Westin Automotive Products, Inc.
320 W. Covina Blvd
San Dimas, Ca. 91773
PROCEDURE
1. Remove contents from box, verify if all parts listed are present and free from damage.
Carefully read and understand all instructions before attempting installation.
Failure to identify damage before installation could lead to a rejection of any claim.
ITEM 5 ITEM 6
ITEM 7
ITEM 4
2. Open the hood of the vehicle and remove the plastic cover at the front using a pry tool. See Figure 1.
3. Remove the four bolts holding the grille in place. See Figure 2.
4. Remove 2 bolts attaching wheel well cover to filler panel. See Figure 3.
Fig. 1
Fig. 2
Fig. 3

3
Thank You for choosing Westin products
For Additional installation assistance please call
Customer service [phone]
www.westinautomotive.com
P.N.: 75-57399-RevA ECO #: W19-0195 DATE: 11/26/19
Westin Automotive Products, Inc.
320 W. Covina Blvd
San Dimas, Ca. 91773
5. Pry off fenders to access the filler panel clips. See Figure 4.
6. Pry filler panel off removing any necessary bolts. See Figure 5.
7. Disconnect any electrical plugs and any bolts still attaching the grill to the vehicle. See Figure 6.
8. Pry remaining clips attaching the grill to the vehicle to remove the grille.
Fig. 4
Fig. 5
Fig. 6
9. Remove 4 upper bumper bolts attaching the bumper to the frame and remove 2 bottom bolts attaching bumper arm to the
frame. See Figure 7 & 8.
10. Remove Bumper.
Fig. 8
Fig. 7 Underneath vehicle
Bolts will be exposed after
removing the grille and lifting
the plastic covering them

4
Thank You for choosing Westin products
For Additional installation assistance please call
Customer service [phone]
www.westinautomotive.com
P.N.: 75-57399-RevA ECO #: W19-0195 DATE: 11/26/19
Westin Automotive Products, Inc.
320 W. Covina Blvd
San Dimas, Ca. 91773
11. Locate the lower driver mounting and support brackets for the Grille Guard. Using the supplied M12 hardware, loosely
install the mounting brackets on to the frame. The mounting bracket and support bracket (5) sandwich the frame. See Fig-
ure 9-10.
12. Repeat on the passenger side.
Fig. 10
9
11
4
2
Frame
8
12
10
Driver Side Shown
Fig. 9
Frame
Item 4
13. Note: Cutting of lower valence is required. Locate the upper support straps (6-7) for the grille guard. Loosely re-install
the front bumper with the upper support straps. Cut out the bumper plastic as necessary for the bracket clearance in the
specified area below (Figure 12). Reconnect all electrical connections. The upper factory bumper bolts will be used for the
upper support straps. Measure the distance between the mounting surfaces of the upper straps and ensure it is about 42.25”.
Torque to 50-55 ft-lbs. See Figure 11-13.

5
Thank You for choosing Westin products
For Additional installation assistance please call
Customer service [phone]
www.westinautomotive.com
P.N.: 75-57399-RevA ECO #: W19-0195 DATE: 11/26/19
Westin Automotive Products, Inc.
320 W. Covina Blvd
San Dimas, Ca. 91773
14. REINSTALL FILLER PANEL AND GRILLE IN REVERSE ORDER AS INSTRUCTED.
ITEM 7
Factory Bolt
Bumper
Fig. 11
42.25 inches
Fig. 13
Fig. 12
1/2 inch
4 1/2 inches
Cut out bumper
to the shape of
the bracket using
these dimensions