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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.
Dee Zee FX Running Board Installation Instruction FX 12958 FX 12358 / FX 12959 FX 12359 (1999 - Current) Chevy 6'/8' Box Pickup SIDE BOX BOARD A B BD 12349 L/R BD 12348 L/R BD FX12949 L/R GSK-15 BD FX12948 L/R X2 GSK-41 LEFT BRACKET E F B 1648LP I PN 310 M X2 B 1648RP 1/4" FLAT WASHER J X8 PN 71 1/4 X 1" PHILLIPS ROUND HEAD SCREW BLACK PN 80 Q PN 78 U PN 71B FX 12958 N X4 PN 114B 1/4 X 1 1/4" HEX HEAD BOLT R X2 PN 265 1/4" HEX NUT BLACK V X8 B 865 BULB SEAL GASKET C MUD FLAP D EN
8mm WASHER Y PN 325 TOOLS REQUIRED X2 WRENCH/RATCHET 3/8", 7/16", 9/16" 13mm, 18mm TAPE MEASURE TIN SNIPS 1 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.
2 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]. 3 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].
4 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 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 (or next) model year section. Once the bracket are installed, proceed to STEP 5.
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.
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.
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.
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.
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.
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.
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.
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 factory bolts.
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.
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.
5 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. 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.
6 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.
7 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. Repeat the assembly steps for the other side of the vehicle.
