Installation Instructions:
MG3 MG4
CHEVY COLORADO/GMC CANYON
5'2" or 6'4” BED LENGTH
NOTE: Most of the images in these instructions are of the short bed, but they apply to both length beds
2015-CURRENT
TOOLS REQUIRED
• Adjustable wrench (that opens to about 1”)
• 1/2” open end wrench
• #2 Phillips screwdriver,
• Short 7/32” hex wrench
• 7/16” deep socket
Watch short installation videos at www.decked.com/video | Register your system at www.decked.com/warranty
FOLLOW US:
VERSION 2
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• 3/8” socket
• Electric drill
• 9/64" drill bit
• Drill stop
@DECKEDUSA | #DECKEDUSA
CONTENTS
DECKED carton
LEFT deck half - 1
RIGHT deck half - 1
Center vert - 1
Cabside vert - 1
Drawer - 2
Left ammo can - 1
Right ammo can - 1
Left stud - 1
Right stud - 1
Ammo can lid - 2
C-channel - 2
Ruler - 1
Hardware box - 1
Torsion brace - 1
Bottle opener - 1
Hardware box - unbagged components
(inside DECKED carton):
Shims - 2
Weather strips - 2
▼ ASSEMBLY OVERVIEW ▼
HARDWARE box - bagged components
PREP-MG3-MG4 - 1
S1 1
S2 - 1
N1 - 1
J5 - 2
DRAWER 1 1
DRAWER 2 1
WHEELS 1
FINAL MID 1
PREPEXTRA 1
MS WASHERS 1
LEFT DECK
(NARROW)
LEFT AMMO
CAN LID
LEFT STUD
CAB
RULER
CENTER VERT
RIGHT DECK
(WIDE)
RIGHT AMMO CAN LID
RIGHT STUD
CABSIDE VERT
RIGHT AMMO
CAN
RIGHT
CCHANNEL
TAILGATE
LEFT AMMO
CAN
LEFT
CCHANNEL
TORSION
BRACE
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▼ HEY! TORQUE BOY: READ BEFORE YOU INSTALL DECKED ▼
1. DON’T be an idiot read the instructions.
2. DON'T over tighten bolts, get em' hand-tight.
3. DON'T use power tools.
4. If you don't follow directions and do use power tools:
1). Set clutch at a very low setting. 2). If you blow it, see NOTE.*
NOTE* Two extra threaded inserts are included in BAG PREP-EXTRA. That’s all you get. The inserts will replace any
stripped inserts in the tailgate ammo cans, but NOT THE CENTER VERT, so hand tighten until snug only! You can
also screw the inserts back in if dislocated. There is a straight screwdriver slot on the underside of the insert.
NOTE: You will need a buddy to help with exactly two steps, not including draining the sixpack
Prevent abusive, expletitive-filled language, watch our detailed installation video or give us a call.
We’re happy to help!
208.806.0251 | DECKED.COM/INSTALLVIDEO
5. Start all bolts with fingers to avoid cross-threading
6. DON'T over tighten J-hooks during installation.
Make 'em good and snug enough to keep the
system from moving in the bed.
7. Nice job if you’re still reading .
PREP BED: MARK CENTER OF BED
• Use a marking pen or wax pencil to mark a centerline (blue) on the raised center bead.
DETAIL A
MAKE SURE MARK SITS AT LEAST
14" HIGH (SO YOU CAN SEE IT)
➡
CAB
A
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PREP BED: SHIMS
• 2 SHIMS that look like this can be found in your hardware kit.
• Using the information below:
1) Clean the bed surface where the shims will be located. Isopropyl alcohol (do not drink) is recommended.
2) Remove tape film and apply shim with the strength of 1000 men a.k.a push really hard.
DETAIL A
DETAIL B
Align shim to channel in floor shown. Place
shim 7" from rear of bed (red).
Align shim to channel in floor shown 3” from
cabside panel of bed (red).
3”
7 "
A
B
➡
CAB
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PREP BED: CABSIDE TIEDOWNS
NOTE: If your truck has the embossed logo on the cabside bulkhead, reverse the bracket installation order
(flip them). For example, bolt-yellow-green-red-nut.
• Sandwich the factory driver side tie-down (green) in between the cabside tie-down bracket (yellow) and the clamp
plate (red); BAG PREP-MG3-MG4
• Fasten securely through the circular holes with 1" bolt and flanged nut; BAG PREP-MG3-MG4
• Repeat passenger side.
FACTORY TIEDOWN
(GREEN)
DETAIL A
FLANGED
NUT
CLAMP PLATE
(RED)
1" BOLT
DETAIL A
INSTALLED
CABSIDE TIEDOWN
BRACKET (YELLOW)
RECOMMENDED TORQUE:
Bolts in labeled bag PREP-MG3-MG4- 27 in-lb.
A
CAB
➡
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ASSEMBLY: CENTER VERT + CABSIDE VERT
NOTE: Perform the next few steps on a flat surface like a garage floor.
• Attach center vert to cabside vert with four bolts. Alternate to tighten; BAG S1.
PLACE HOOK ON CENTER VERT
OVER NOTCH IN CABSIDE VERT
CENTER VERT
RECOMMENDED TORQUE:
S1
HELPFUL TIP: BAG S1, a.k.a "Bunker Hill," is required
Bolts in labeled bag S1 - 27 in-lb.
CABSIDE VERT
for most of the steps, so keep it close! These bolts are
highlighted throughout instructions in RED.
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ASSEMBLY: LOOSELY ATTACH STUDS (YUP)
• LOOSELY attach studs to cabside vert with six bolts; BAG S1.
CENTER VERT
DRIVER
SIDE STUD
RECOMMENDED TORQUE:
Bolts in labeled bag S1 - 27 in-lb.
CABSIDE VERT
PASSENGER
SIDE STUD
S1
KEEP LOOSE
S1
KEEP LOOSE
(YOGA HELPS)
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ASSEMBLY: ALIGN & TIGHTEN STUDS (YUP)
NOTE: This step ensures the studs are properly located before tightening bolts. It's important.
• Place ammo cans to support tailgate end of deck panels.
• Lift deck panels on center vert + stud + cabside vert assembly.
• Slide studs around L-R until deck panels are seated.
• DETAIL A: Loosely secure four bolts to hold decks onto studs; BAG S1.
• Now you can securely tighten the bolts that hold the studs to the cabside vert.
• Unbolt deck from studs, remove deck panels, save bolts, remove ammo cans and set aside for later assembly.
DETAIL A
S1
A
YOU WILL REMOVE AND SAVE THESE BOLTS
AFTER TIGHTENING CABSIDE VERT + SHIM
BOLTS
TIGHTEN AND SECURE
RECOMMENDED TORQUE:
Bolts in labeled bag S1 - 27 in-lb.
HELPFUL TIP: This step seems like a waste of time,
but Dr. DECKED says it's important...don't skip out.
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ASSEMBLY: STUD BRACKETS
• DETAIL A: Attach driver side stud bracket to driver side stud using three 3 1/2" bolts and three flanged nuts
into proper hole locations (green). Tighten securely; BAG PREP-MG3-MG4
• DETAIL B: Repeat steps in DETAIL A on passenger side.
DETAIL A DETAIL B
CAB
➡
DRIVER SIDE BRACKET
A
PASSENGER SIDE
BRACKET
CAB
➡
RECOMMENDED TORQUE:
Bolts in labeled bag PREP-MG3-MG4- 27 in-lb.
B
➡
CAB
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ASSEMBLY: MOUNT ASSEMBLY
• DETAIL A: While supporting both ends, lift center vert + stud + cabside vert assembly in truck bed.
NOTE: Make sure centerline arrows on cabside vert are aligned with your centerline marks (blue).
• DETAIL B: Place stud brackets cabside of cabside brackets (yellow). Loosely fasten with 3/4" bolt and flanged nut;
BAG PREP-MG3-MG4.
• Repeat passenger side.
• Make sure assembly is still on centerline,
then securely tighten both sides.
RECOMMENDED TORQUE:
Bolts in labeled bag PREP-MG3-MG4- 53 in-lb.
DETAIL A
➡
DETAIL B
FLANGED
NUT
CAB
3/4" BOLT
A
B
CAB
➡
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INSTALL: CCHANNEL
• Loosely place driver side ammo can at tailgate corner of bed.
• Place driver side C-channel on ledge of stud and ammo can with end plate cabside.
• DETAIL A: Insert two bolts through C-channel into ammo can and loosely fasten with nut; BAG S2, BAG N1.
• DETAIL B: Tightly attach C-channel to stud; BAG S1.
• Repeat passenger side.
DETAIL A DETAIL B
KEEP LOOSE TIGHTEN
➡
CAB
RECOMMENDED TORQUE:
Bolts in labeled bag S1 - 27 in-lb.
➡
CAB
CCHANNEL
END PLATE
N1
S2
A
S1
B
➡
CAB
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INSTALL: DECK HALVES
• Loosely place deck panel on side stud, center vert and ammo can.
• Shift ammo can forward, rearward, L-R, as necessary to align with fully seated deck panel.
• Loosely assemble:
• Five bolts through deck panel into center vert; BAG S1.
• Four bolts with nylon and rubber washers installed as shown through
deck panel into stud; BAG S1, BAG MS WASHERS.
• Eight bolts with nylon and rubber washers installed as shown through
deck panel into ammo can; BAG S1, BAG MS WASHERS.
• Tighten all S1 bolts.
• Securely tighten C-channel/ammo can nuts and bolts.
• Repeat other side (making sure you don't forget to securely tighten C-channel/ammo can nuts and bolts).
S1
RECOMMENDED TORQUE:
Bolts in labeled bag S1 & S2 - 27 in-lb.
NYLON WASHER
RUBBER WASHER
CAB
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➡
INSTALL: JHOOKS
• Loosely assemble driver side J-hook assembly in order shown through second closest tailgate side hole in
ammo can as shown; BAG J5.
• Repeat passenger side.
DRIVER SIDE AMMO CAN PASSENGER SIDE AMMO CAN
KEEP LOOSE KEEP LOOSE
✕
✕
TAILGATE
✕
J5
J5
✕
✕
✕
TAILGATE
HELPFUL TIP: Make sure the hooks
open toward tailgate.
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DRAWERS: BRACKETS + WHEELS
• Each drawer has a left and a right bracket. Bolt brackets into place via bottom two holes in bracket with 3/4"
length bolts. Use the 2" length bolt for the upper cabside wall hole in bracket; BAG DRAWER 1.
• Install a tube brace in each drawer with two 3/4" length bolts; BAG DRAWER 1, BAG DRAWER 2.
• Attach wheels onto drawer brackets with a 7/32" hex wrench; BAG WHEELS.
RECOMMENDED TORQUE:
Bolts in labeled bags DRAWER 1 and DRAWER 2 - 27 in-lb.
TUBE BRACE
GOES HERE
DRAWER 1
Bolts in labeled bag WHEELS - 90 in-lb.
2" BOLT
CORNER
BRACKET
HELPFUL TIP: If you purchased drain
plugs, install now (instructions are
➡
CAB
WHEELS
DRAWER 2
DRAWER 1
included with drain plugs).
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DRAWERS: AXLE WHEELS + WEATHERSTRIPS
• Slide narrow drawer into driver side drawer cavity. NOTE: It is easier to fully install narrow drawer first.
• DETAIL A: Install two tailgate wheels onto narrow drawer axles with a 7/32" hex wrench; BAG WHEELS.
• Repeat with wide drawer.
• DETAIL B: Install weatherstrips on top of drawer edges
IMPORTANT: Facing the weatherstrip the wrong way will funnel water into drawer: DUH!
WITH WIPER BLADE POINTING TOWARD DRIVER.
DETAIL A
RECOMMENDED TORQUE:
Wheel bolts - 90 in-lb.
HELPFUL TIP: To make this step easier, jam a 2" piece of
material under drawer, or get your pal to pinch the drawer
up to the deck to give you better leverage.
HELPFUL TIP: Cut weatherstrips if they overhang.
➡
CAB
DETAIL B
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FINAL STEPS: TORSION BRACE + BOTTLE
OPENER
• Slide torsion brace under center vert and tailgate ammo cans.
NOTE: If you jumped the gun and tightened the J-hooks when installing, loosen them.
• Loosely install:
• Two bolts with nylon washers through the end holes in torsion brace into ammo cans; BAG S1.
• Two bolts with nylon washers through the bottom bottle opener holes and torsion brace into center vert; BAG S1.
• Two 1/2" length bolts through upper holes in bottle opener into center vert; BAG FINAL MID.
• Align bottle opener to edges of center vert and tighten four bottle opener bolts.
• Tighten end bolts into tailgate ammo cans.
• Finally.....Tighten the J-hooks! DO NOT OVER TIGHTEN, just make snug. Make sure the gap between the
sidewall of the bed and the deck is equal on both sides.
RECOMMENDED TORQUE:
Bolts in labeled bag S1 - 27 in-lb.
J-hooks - 9 in-lb.
NYLON WASHER
TORSION BRACE
HELPFUL TIP: Bottle opener goes outside
of torsion brace.
1/2" LENGTH
BOLTS BAG
FINAL MID
BOTTLE OPENER
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BAM BAM: THE RULER
• Center ruler in embossed area and screw three 1/2" length Phillips screws through the tailgate side holes directly
into deck panels; BAG FINAL MID.
NOTE: These are small gauge screws. Tighten to a light snuggle ONLY.
• For the three cabside ruler mounting holes, drill each with a 9/64" bit and a drill stop set to 1/2". There is a lateral
steel tube that runs on the underside of the deck at this location. (SEE UNDERSIDE VIEW OF DECK).
IMPORTANT: Only drill through TOP of steel tube; do not drill through bottom of tube, 'lest you want to pull a
Niagara Falls and funnel water into your drawers.
• Screw three 3/4" length Phillips screws into the cabside ruler holes you just drilled; BAG FINAL MID.
STEEL TUBE RUNS LATERALLY UNDER THESE 3 RULER
HOLES. THEY TAKE THE 3/4" SCREWS.
UNDERSIDE VIEW OF DECK
DO: Drill through the top of steel
tube ONLY.
DO NOT: Drill through both sides
of steel tube = YOU'RE FIRED!
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9/64" DRILL BIT
DRILL STOP
1/2”
FINAL STEPS: AMMO CAN LIDS
• DETAIL A: Ammo can lids are driver (marked L) and passenger (marked R) side specific.
• DETAIL B: Holding lid in orientation shown, insert tab on tailgate end of ammo can lid and push the cabside end of lid
down to secure. Don't be afraid to give'r the Fonzi to close, it's rugged.
• Insert lock hole plugs, unless you ordered drawer locks! Install drawer locks now (instructions with locks);
BAG FINAL MID.
IMPORTANT: Grab your favorite beverage, crack 'er open in the bottle opener and christen this ship!
You did it. Immediately post a photo of your significant other, child or canine (in no order of significance)
appreciating your accomplishment. Add hashtag #DECKEDUSA | @DECKEDUSA.
DETAIL A
DRIVER SIDE
AMMO CAN LID
PASSENGER SIDE
AMMO CAN LID
DETAIL B
FINAL MID
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DECKED 3-YEAR LIMITED WARRANTY
(a.k.a. LEGAL MUMBO JUMBO)
DECKED LLC warrants to the original purchaser of this product that the product will be free from manufacturing defects in
workmanship and materials for a period of three (3) years from the date of the original purchase. If within three (3) years from the
original date of purchase this product fails due to defect in materials or workmanship, DECKED LLC will replace any defective part at
its option.
The original purchaser must contact the DECKED LLC customer service team and provide a description of the defective part,
including digital pictures if requested, with the original purchase documentation as validation of warranty coverage or have
previously activated their warranty online.
This warranty DOES NOT cover or apply to:
• Damage to the product due to misuse, mishandling and abuse.
• Products not used in accordance with the manufacturer’s instructions or recommendations.
• Product not assembled or installed according to manufacturer’s instructions.
• Normal wear and tear.
• Undeclared damage to the system during shipping, acts of God. In addition, consequential damage and incidental
damages (including lost time) such as damage to persons or property are not covered under this warranty.
REGISTER YOUR PRODUCT FOR ANY FUTURE WARRANTY NEEDS. DECKED.COM/REGISTER
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