DECKED MG4, MG3 User Manual
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
DECKED.COM | 208.806.0251
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• 3/8” socket
• Electric drill
• 9/64" drill bit
• Drill stop
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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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