GMC GMT900 User manual

INSTALLATION INSTRUCTIONS
SHEET OF
PART NO. 1
19157544
AUTH DRDATE REVISION
ALL INFORMATION WITHIN
ABOVEBORDERTOBEPRINTED
EXACTLYAS SHOWN ON 8.5x 11
WHITE 16 POUND NON-BOND
RECYCLABLE PAPER.
PRINTONBOTHSIDES,EXCLUD-
ING TEMPLATES.
TO BE UNITIZED IN ACCOR-
DANCE WITH GMSPO SPECIFI-
CATIONS.
SHEET OF
19157544
PART NO. 1
TITLE
GMT900 Commercial Overhead Rack Set REV 09OC06
GMT900 Commercial Overhead Rack Set
6200 Grand Pointe Dr., Grand Blanc, MI 48439
15
15
17AU06
GMT900 Commercial Overhead Rack Set
IMPORTANT: READALLINSTRUCTIONSBEFOREINSTALLATION.
FOLLOWALLINSTRUCTIONSCAREFULLY.
NOTE: This Overhead Rack System requires the use of an auxillary
Center High Mounted Stop Lamp (CHMSL). Reference Service Bulletin at
your GM Dealer for details.
Contents:
Item No. Qty. Description
1A 1 Front Rack Corner - Driver’s Side
2A 1 Front Rack Corner - Passenger’s Side
1B 1 Rear Rack Corner - Driver’s Side
2B 1 Rear Rack Corner - Passenger’s Side
3 2 Crossbar
4 4 Crossbar End Cap
5 4 Corner Brace
6 4 Rail Nut Assembly
7 8 Hex Bolt, M10x1.5
8 8 Washer, M10
9 12 T-Bolt, M10-1.5
10 12 Lock Nut, M10x1.5
11A 4 Button Head Cap Screw, M6-1.0
11B 4 Socket Head Cap Screw, M6-1.0
12 4 Slide Mount End Cap
13 2 Slide Mount Slide
14 4 Knob
15 4 Tie Down Package
16 2 Centering Aid (Not Shown)
17 1 Pick-Up Box Cargo Management
Accessories Owner’s Manual (Not Shown)
Tools Needed
15 mm Socket and Driver
16 mm Socket and Driver
4 mm Hex Wrench
Tape Measure
IMPORTANT: VERIFY THAT ALL PARTS ARE PRESENT.
IMPORTANT: AFTER OVERHEAD RACK IS INSTALLED YOU
WILL NOT BE ABLE TO INSTALL OR REMOVE CARGO
MANAGEMENT SYSTEM TIE DOWNS THAT CAME WITH
YOUR TRUCK FROM EITHER THE FRONT RAIL OR THE TOP
SIDE RAILS. HOWEVER, CONSIDERATIONS CAN BE GIVEN
FOR CONFINED PLACEMENT OF THESE TIE DOWNS PRIOR
TO INSTALLATION OF THIS OVERHEAD RACK AT EITHER OF
THESE LOCATION.
I
REAR OVERHEAD RACK
FRONT OVERHEAD RACK
27SE06 R
09OC06

INSTALLATION INSTRUCTIONS
SHEET OF
PART NO. 2
19157544
AUTH DRDATE REVISION
ALL INFORMATION WITHIN
ABOVEBORDERTOBEPRINTED
EXACTLYAS SHOWN ON 8.5x 11
WHITE 16 POUND NON-BOND
RECYCLABLE PAPER.
PRINTONBOTHSIDES,EXCLUD-
ING TEMPLATES.
TO BE UNITIZED IN ACCOR-
DANCE WITH GMSPO SPECIFI-
CATIONS.
SHEET OF
19157544
PART NO. 2
TITLE
GMT900 Commercial Overhead Rack Set REV 09OC06
GMT900 Commercial Overhead Rack Set
6200 Grand Pointe Dr., Grand Blanc, MI 48439
15
15
Step 1 Preassemble the Rail Nuts
1. Thread a 10mm Bolt with a washer through the Rail Nut
so the thread protrudes 1/8 inch through the spring side
of the nut (See Figure 1). Repeat for 3 remaining Rail
Nuts.
Step 2 Install the Rear (Sliding) Rack Corners and Crossbar
2.1 Position the Slide Mount Slide onto the top rail of the
cargo management track (See Figure 2). IMPORTANT:
Use care in bending the slide around the formation in the
rear of the truck bed. Over bending could damage the
slide.
2.2 Place the Driver’s Side Rear Rack Corner (the one with
the safety pin assembly) at an angle and attach the top
lip of the Slide Mount corner base onto the top rail, pull
the safety pin and rotate into an upright position. This
MUST be done towards the cab end of the truck (See
Figure 3). Exercise care to prevent scratching the
painted surfaces of the pickup bed.
2.3 Position the Slide Mount Slide into the space between
the face of the cargo management track and the Slide
Mount. Pull the safety pin to fully install the Slide into
the Slide Mount (See Figure 4).
FIGURE 1
FIGURE 2
FIGURE 3
FIGURE 4
WASHER
HEX BOLT
RAIL NUT
ROTATE INTO
UPRIGHT POSITION
DRIVER'S
SIDE SLIDE
MOUNT SLIDE
PASSENGER'S
SIDE SLIDE
MOUNT SLIDE

INSTALLATION INSTRUCTIONS
SHEET OF
PART NO. 3
19157544
AUTH DRDATE REVISION
ALL INFORMATION WITHIN
ABOVEBORDERTOBEPRINTED
EXACTLYAS SHOWN ON 8.5x 11
WHITE 16 POUND NON-BOND
RECYCLABLE PAPER.
PRINTONBOTHSIDES,EXCLUD-
ING TEMPLATES.
TO BE UNITIZED IN ACCOR-
DANCE WITH GMSPO SPECIFI-
CATIONS.
SHEET OF
19157544
PART NO. 3
TITLE
GMT900 Commercial Overhead Rack Set REV 09OC06
GMT900 Commercial Overhead Rack Set
6200 Grand Pointe Dr., Grand Blanc, MI 48439
15
15
2.4 Attach the Slide Mount End Caps with 6mm button head
cap screws. Ensure screws are fully driven, fully seated
and not stripped (See Figure 5).
2.5 Slide the Rear Rack Corner towards the rear of the bed.
When at the desired position, allow the pin to engage
into a hole in the rail. Install and tighten two lock down
Knobs on the Slide Mount corner base.
2.6 Install the Passenger’s Side Rear Rack Corner by
repeating step 2.2 on the passenger’s side of the truck
bed. Note: Do not yet install Knobs or End Caps to
Slide Mount.
2.7 IMPORTANT: To assure the Rear Rack Assembly
slides freely on the cargo management track when fully
assembled, position the Passenger’s Side Rear Rack
Corner precisely across from the Driver’s Side Rear
Rack corner using the holes in the cargo management
rails as reference points and insert the Centering Aids to
correctly align the Slide Mount corner base of the
Passenger’s Side Rear Rack Corner (See Figure 6).
Install and tighten the two Knobs onto the Slide Mount
corner base.
2.8 To preassemble the Crossbars insert six 10mm T Bolts
into the bottom slot, three towards each end of the
Crossbar. IMPORTANT: Be sure to orient the Crossbar
with the flat indentation facing down (See Figure 7).
FIGURE 5
FIGURE 6
FIGURE 7
SLIDE
MOUNT
END CAP
6MM BUTTON HEAD SCREW
CENTERING
AID
RAISED EDGE
FLAT
INDENTATION
SADDLE
PLATE
CROSSBAR
ORIENTATION:
LARGER EDGE
TOWARDS
RAIL FACE
TOP VIEW

INSTALLATION INSTRUCTIONS
SHEET OF
PART NO. 4
19157544
AUTH DRDATE REVISION
ALL INFORMATION WITHIN
ABOVEBORDERTOBEPRINTED
EXACTLYAS SHOWN ON 8.5x 11
WHITE 16 POUND NON-BOND
RECYCLABLE PAPER.
PRINTONBOTHSIDES,EXCLUD-
ING TEMPLATES.
TO BE UNITIZED IN ACCOR-
DANCE WITH GMSPO SPECIFI-
CATIONS.
SHEET OF
19157544
PART NO. 4
TITLE
GMT900 Commercial Overhead Rack Set REV 09OC06
GMT900 Commercial Overhead Rack Set
6200 Grand Pointe Dr., Grand Blanc, MI 48439
15
15
2.9 Position one (preassembled) Crossbar across the two
Rack Corner saddle plates, fitting two T-Bolts into the
holes in each saddle plate. Keep the third T-Bolt inside
the saddle plate on each side. Loosely assemble a
10mm Self Locking Nut onto each of the four T-bolts
(See Figure 8).
2.10 To center the Crossbar between the two Rack Corners,
measure 5 ¾ inch overhang from one end of the Cross-
bar to the saddle plate and tighten the four Self Locking
Nuts (See Figure 8). Torque to 25Nm.
2.11 FULLY loosen the Knobs on the Passenger’s Side Rack
Corner and remove the Centering Aids (Figure 6).
2.12 Install Slide Mount Slide into passenger's side rack
corner by following Steps 2.1 and 2.3
2.13 Attach the end cap with a 6mm Socket Head Screw to
each end of the crossbar using an allen wrench (Be sure
that the GM logo is right side up) (Figure 5). Torque to
10 N/m.
2.14 FULLY loosen knobs on the Driver’s Side Rack Corner.
With pin disengaged verify Rear Rack Assembly slides
freely. NOTE: If Rear Rack Assembly does not slide
freely, loosen only the Self Locking Nuts on the
Passenger’s Side Saddle Plate (Figure 8) and realign
Passenger’s Side Rear Corner to Crossbar. Centering
Aids are designed to center the Passenger’s Side Rear
Corner onto the cargo management track.
2.15 Attach the two Corner Braces. Be sure to orient the
Corner Braces so the end with the dimple fits over the
Rivnut on the Rack Corner (See Figure 8). Secure the
Corner Brace to the corner with a 10mm Bolt and
washer. The flat end of the brace is attached to the
Crossbar with the remaining T-bolt and Self Locking Nut.
Tighten all nuts completely. Torque to 25 Nm.
IMPORTANT: Do not over tighten nuts.
2.16 Attach the Crossbar End Caps with a Screw to each end
of the Crossbar using a hex wrench (Be sure that the
GM logo is right side up). Torque to 10 Nm.
FIGURE 8
5 1/4"
FRONT
RACK
5 3/4"
REAR
RACK
FIGURE 9
CROSSBAR
T-BOLT
SADDLE PLATE
LOCK NUT
CORNER
BRACE
DIMPLE SIDE
HEX
BOLT
WASHER
RIVNUT
SLIDE
INTO
PLACE
AND
TIGHTEN

INSTALLATION INSTRUCTIONS
SHEET OF
PART NO. 5
19157544
AUTH DRDATE REVISION
ALL INFORMATION WITHIN
ABOVEBORDERTOBEPRINTED
EXACTLYAS SHOWN ON 8.5x 11
WHITE 16 POUND NON-BOND
RECYCLABLE PAPER.
PRINTONBOTHSIDES,EXCLUD-
ING TEMPLATES.
TO BE UNITIZED IN ACCOR-
DANCE WITH GMSPO SPECIFI-
CATIONS.
SHEET OF
19157544
PART NO. 5
TITLE
GMT900 Commercial Overhead Rack Set REV 09OC06
GMT900 Commercial Overhead Rack Set
6200 Grand Pointe Dr., Grand Blanc, MI 48439
15
15
3.2 Starting with the driver’s side, mount the Front Rack
Corner into the track units and slide the Rail Nuts into
the slots on the rack corner making sure that the
washer is against the head of the bolt (See Figure 11).
Tighten the 10mm Bolts and torque to 35 Nm. Repeat for
passenger’s side.
3.3 Position one (preassembled) Crossbar across the two
Rack Corner saddle plates, fitting two T-Bolts into the
holes in each saddle plate. Keep the third T-Bolt inside
the saddle plate on each side. Loosely assemble a
10mm Self Locking Nut onto each of the four T-bolts
(See Figure 8).
3.4 To center the Crossbar between the two Rack Corners,
measure 5 ¼ inch overhang from one end of the Cross-
bar to the saddle plate and tighten the four Self Locking
Nuts (See Figure 8). Torque to 25Nm.
3.5 Repeat Steps 2.14 and 2.15 for Front Crossbar.
Step 4 Install the Tie Downs
4.1 Insert two Tie Down T-bolts through the machined slot in
the top slot of each Crossbar. IMPORTANT: Machined
threads on Tie Down T-bolts are not same size as other
T-bolts in the package.
4.2 Review orientation of Tie Downs in Figure 9. Insert and
slide key on the Tie Down body through the machined
slot in the top slot of each crossbar and engage T-bolt
into hole in the Tie Down body. Attach Tie Down Knob,
slide to desired position and tighten firmly.
4.3 Repeat for three remaining Tie Downs.
Step 5 Place the Pick-Up Box Cargo Management Accesso-
ries Owner’s Manual inside the glove box along with the
vehicle Owner’s Manual.
FIGURE 11
FIGURE 10
Step 3 Install the Front Rack Corners and Crossbar
Important: Both the front and side cargo management rails
must be aligned to the same height for the Front Rack Corners
to fit properly. Check corner base for fit before installing. If
misalignment is evident, loosen front rail, align to side rails and
re-tighten attachment bolts to 18 Nm.
3.1. Install the four Rail Nuts by inserting each nut, spring
side first into the slot between the upper and lower rails
of the cargo management tracks. Turn each nut clock-
wise one-quarter turn to lock it into place. Insert two
Rail Nuts into the front track (one at the driver’s side
end and one at the passenger’s side), and one into the
front end of each of the sidetracks (See Figure 10).