Dee Zee FX12358 User Manual

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to the store of purchase

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Dee Zee Running Board Installation Instructions

Congratulations on your purchase of a quality Dee Zee product. Dee Zee is

recognized as having the highest quality running boards and accessories on

the market today. We have earned this reputation by offering our customers

a product they can be proud to place on their vehicles. Dee Zee meets all

the criteria of manufacturing a custom-fit product which guarantees it to

be the easiest product to install.

Note: Please take time to read all of the instructions before beginning this installation.

War ning! Please check for wiring or other obstr uctions before drilling any holes into
the vehicle. If it is necessar y to drill any holes into the vehicle, Dee Zee recommends
putting a sealant or rust inhibitor around all holes drilled into the body of the vehicle.

War ning! It is the sole responsibility of the vehicle owner to check for tire clearance.

War ning! It is unlawful and dangerous to ride on r unning boards or side box boards
while the vehicle is in motion.

Cleaning Instructions: To maintain the bright finish of your Dee Zee running boards,
clean with a mild deter gent. For our stainless steel products and accessories, the
application of a high grade automotive type wax is recommended.

If you should happen to have any questions with this product or you have an

installation question, please feel fr ee to call us at:

1-800-779-8222

If you would like to find out mor e infor mation on Dee Zee’s products please

feel free to visit our website at:

WWW.DEEZEE.COM

BD 12349 L/R

BD 12348 L/R

BD FX12949 L/R

GSK-15

BD FX12948 L/R

X2

GSK-41

4 FT/6.25FT

MUDFLAP

1 LH / 1 RH

B 1648LP

1 LH / 1 RH

B 1648LP

X2

B 1648RP

X2

B 1382N

X2

PN 86A

X 8

Dee Zee FX Running Board Installation Instruction

FX 12958 FX 12358 / FX 12959 FX 12359 (1999 - Current) Chevy 6'/8' Box Pickup

PN 310

X8

PN 71

X8

PN 97B

X2

PN 140

X8

BLACK

PN 80

X4

PN 114B

X2

PN 113B

X2

PN 407

X2

BLACK

PN 78

X2

PN 265

X2

PN 96B

X8

PN 848-CHY

X12

PN 71B

X8

B 865

X4

PHB196

X4

PN 836

X2

SIDE BOX BOARD BULB SEAL GASKET MUD FLAP END CAPS

A B C D

LEFT BRACKET

RIGHT BRACKET SUPPORT BRACKET 1/4 X 3/4"SLOTTED

E F G H

I J K

M

1/4" FLAT WASHER 1/4" HEX NUT SHEET

METAL SCREW

1/4 X 1" PHILLIPS

N O

3/8 X 1 1/4" HEX

HEAD BOLTROUND HEAD SCREW

3/8" FLAT WASHER

L

P

HEX HEAD BOLT

#10 X 5/8" BLACK

PHILLIPS HEAD SCREW

3/8" THREADED

PLATE

Q R S

U

FX 12958 1 OF 17 6/1/2011

1/4 X 1 1/4" HEX

HEAD BOLT

1/4" HEX NUT 9" ANGLE BRACE

BLACK

V W

1/4" FENDER

WASHER

1/4 X 1" HEX

HEAD BOLT

BENT SPACER 8mm X 40mm BOLT

T

1/4" FLAT WASHER

BLACK

X

PN 325

X2

WRENCH/RATCHET

3/8", 7/16", 9/16"

TAPE

13mm, 18mm

MEASURE

TIN SNIPS

PHILLIPS SCREWDRIVER

1/8" 3/16" 1/4"

OR PHILLIPS BIT FOR DRILL

DRILL BIT

Place the bulb-seal gasket [B] onto the backlip of the runing board [A]. Cut the bulb-seal gasket

with tin snips so that it is flush with the ends of the board

Slide two 1/4 x 3/4" slotted hex head bolts [H] into both of the bolt channels on the bottom

side of the running board.

Y

8mm WASHER

TOOLS REQUIRED

1

FX 12958 2 OF 17 6/1/2011

Place the end cap [D] onto the running board as shown below. The image shown is the drivers side

side box board. Secure the end cap in place using a phillips head screwdriver and

two 1/4 x 1" black phillips head round head screws [M].

2

Place the mud flap [C] onto the running board as shown below. The image shown is the drivers side

side box board. Secure the mud flap in place using a 3/8" socket or wrench and

one black sheet metal screw [K]. Holding the end cap against the running board to minimize the

gap on the top surface, drill a 1/8" hole through the end cap and board on the bottom side .

Attached the end cap with a sheet metal screw [L].

3

FX 12958 3 OF 17 6/1/2011

The installation of the board brackets will vary depending on the model year of the vehicle.

On the following pages, find the appropriate section for your model year and follow the installtion

(or next) model year section. Once the bracket are installed, proceed to STEP 5.

1999 -2007 Driver Side Front Brace

Locate the front sub-box support as shown below. Remove the factory bolt holding the frame to

the bottom of the sub-box support using an 18mm socket and ratchet.

4

instructions. If your vehicle does not match the photos, there may be some model year crossover features.

If your vehicle model year is at the start or end of a model year change, you may need to use the previous

FX 12958 4 OF 17 6/1/2011

1999 -2007 Driver Side Front Brace (continued)

Place the support bracket [G] into the sub-box support.

Attach the support bracket to the sub-floor support using a 1/4 x 1 1/4" hex head bolt [Q] and a 1/4"

fender washer [R] where shown in the photo on the right.

Attach the LH running board brace [E] using the factory bolt previously removed

and a 1/4 x 1 1/4" hex head bolt [Q] and a 1/4" fender washer [R].

Tighten the factory bolt using an 18mm socket. Tighten the 1/4" bolts using a 7/16" wrench or socket.

FX 12958 5 OF 17 6/1/2011

1999 -2007 Driver Side Rear Brace

Locate the rear sub-box support as shown below. Remove the factory bolt holding the frame to

the bottom of the sub-box support using an 18mm socket and ratchet.

FX 12958 6 OF 17 6/1/2011

1999 -2007 Driver Side Rear Brace

Place the left mounting bracket [E] up to the sub-box support and attach using the factory bolt

previously removed.

Place a 3/8 x 1 1/4" hex head bolt [N] and 3/8" washer [O] up through the other hole in the mounting

bracket and thread into the 3/8" threaded plate [P].

Tighten the factory bolt using an 18mm socket. Tighten the 3/8" bolt using a 9/16" wrench or socket.

FX 12958 7 OF 17 6/1/2011

2007 - 2010 Driver Side Front Brace

Locate the front sub-box support as shown below. Remove the factory bolt holding the frame to

the bottom of the sub-box support using an 18mm socket and ratchet.

FX 12958 8 OF 17 6/1/2011

2007 - 2010 Driver Side Front Brace (continued)

Place a 3/8" threaded plate [P] into the end of the sub-box support and align with the hole.

Put the left hand mounting bracket [E] up to the sub-box support and attach using the previously removed

factory bolt. Attach the other end of the bracket using a 3/8 x 1 1/4" hex head bolt [N] and

3/8" flat washer [O] into the threaded plate.

Tighten the factory bolt using an 18mm socket. Tighten the 3/8" bolt using a 9/16" wrench or socket.

FX 12958 9 OF 17 6/1/2011

2007 - 2010 Driver Side Rear Brace

Locate the rear sub-box support as shown below. Remove the factory bolt holding the frame to

the bottom of the sub-box support using an 18mm socket and ratchet.

FX 12958 10 OF 17 6/1/2011

2007 - 2010 Driver Side Rear Brace (continued)

Place the support bracket [G] into the sub-box support. Attach using a 1/4 x 1 1/4" hex head bolt [Q]

and 1/4" fender washer [R] through the sub-floor support into the support bracket.

Attached the mounting bracket [E] using the previously removed factory bolt

and a 1/4 x 1 1/4" hex head bolt [Q] and a 1/4" fender washer [R].

Tighten the factory bolt using an 18mm socket. Tighten the 1/4" bolts using a 7/16" wrench or socket.

FX 12958 11 OF 17 6/1/2011

2010 - Current Driver Side Front Brace

Locate the rear sub-box support as shown below. Remove the factory bolt holding the frame to

the bottom of the sub-box support using an 18mm socket and ratchet.

Remove the bolt at the front of the sub-floor support using a 13mm socket and ratchet.

18mm

13mm

Put the left hand mounting bracket [E] up to the sub-box support and attach using the previously removed

Tighten the factory bolt using an 18mm socket. Tighten the 8mm bolt using a 13mm wrench or socket.

factory bolts. If the white plastic tab interferes with the brace, if may be trimmed to allow the brace to fit.

FX 12958 12 OF 17 6/1/2011

2010 - Current Driver Side Rear Brace

Locate the rear sub-box support as shown below. Remove the factory bolt holding the frame to

the bottom of the sub-box support using an 18mm socket and ratchet.

Attach the mounting bracket [E] using the previously removed factory bolt, but don't tighten completely.

FX 12958 13 OF 17 6/1/2011

2010 - Current Driver Side Rear Brace (continued)

Put the 8mm bolt [X] through the 8mm washer [Y] and a bent spacer [W], then put the bolt through

the slot in the brace, and through another bent spacer [W] on the top of the brace. Thread the 8mm

bolt into the weld nut on the sub-floor support.

Tighten the factory bolt using an 18mm socket. Tighten the 8mm bolt using a 13mm wrench or socket.

FX 12958 14 OF 17 6/1/2011

Attach the angle brace [V] to the main upright braces using the 1/4" x 1" hex head bolt [S],

the 1/4" flat washer [T], and the 1/4" hex nut [U]. The driver side rear bracket is shown below.

5

The angle braces [V] on the front and rear main brace should be pointing towards each other.

Secure the angle braces in place, but do not tighten completely.

FX 12958 15 OF 17 6/1/2011

Align the bolt in the channels on the bottom of the running with the slots in the angle braces and

insert the bolts into the slots. Attach the running board to the braces using the 1/4" flat washers [I],

and the 1/4" hex nuts [J]. Note: the board may need to be angled back to get the bolts aligned

with the slots in the bracekts. Also the flap should be located against the wheel well.

Once the board is aligned with the cab board and the step surface of the side box board matches

the cab board. Tighten the bolts the attach the running board to the angle braces and the bolts

that attach the angle brace to the main upright brace using a 7/16" wrench and socket

6

FX 12958 16 OF 17 6/1/2011

Pressing the flap up against the wheel well opening, drill three 1/8" holes through the mudflap and

the sheet metal of the wheel well. Secure the flap using the sheet metal screw [L] with a

phillips drive bit or phillips screwdriver.

7

Repeat the assembly steps for the other side of the vehicle.

FX 12958 17 OF 17 6/1/2011