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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 Brite Tread Running Board Installation Instruction DZ 3378 (2010 - Current) Dodge 8' Dually A SIDE BOX BOARD BD 3375 LP/RP E B 1939LP I PN 248 M PN 87 Q PN 90B DZ 3378 B 1LH/1RH GSK-41 LEFT FRONT BRACKET F BULB SEAL GASKET C 4 FT MUDFLAP RIGHT FRONT BRACKET G X1 B 1939RP X1 B 1938LP 1/4" U-NUT 1/4" FLAT WASHER J X2 PN 72 1/4 X 1" RIBNECK CARRIAGE BOLT N X8 PN 407 3/8" HEX NUT R X2 PN 650 K X 44 PN 70 3/8" THREADED PLATE O X2 PN 114B M12 BOLT S X4 PN 78 1 OF 10 MUD FLA
TOOLS REQUIRED WRENCH/RATCHET 7/16", 9/16" 8mm TAPE MEASURE TIN SNIPS 1/4" DRILL BIT 1 M8 ALLEN Locate the front sub-box support as shown below.
Insert the support brace [D] into the opening at the front box support and attach to the brace using the 3/8" bolt [O], two 3/8" washers [P], and a 3/8" nut [Q]. Attach the lower hole in the brace through the sheet metal using a 3/8" bolt [O], 3/8" washer [P], and the threaded plate [N]. Back side of mounting location. Tighten the upper bolts using a M8 allen wrench and 9/16" socket and wrench. Tighten the lower bolts using a 9/16" socket and wrench.
2 Locate the rear sub-box support as shown below.
Place a 1/4" washer [J] and 1/4" nut [L] on one end of the u-nut [I]. Insert the u-nut in to the brace hole as shown below. Bring the end of the u-nut through the other hole in the brace and attach with a 1/4" washer [J] and a 1/4" nut [L]. Tighten the bolts using a M8 allen wrench and 7/16" socket and wrench.
3 Attach the angle brace[T] to the main braces using the 1/4" x 1 1/4" bolt [S], 1/4" washer [J] and 1/4" nut [L]. When installed the angle braces should be pointing towards the rear of the vehicle. Do not completely tighten at this time.
4 Using tin snips, cut the gasket provided into 2 equal pieces (approximately 24"). Place bulb-seal gasket [B] onto the back lip of the running board. The gasket will not run the entire length of the board back lip. 5 Attach the mudflap [C] to the running board using two 1/4" bolts [K], four 1/4" washers [J], and two 1/4" nuts [L]. Line the outside and bottom of the flap up with the running board and tighten in place using a 7/16" wrench and socket.
6 Using a 8mm wrench/socket, remove the two factory bolts shown below from the wheel well. Do NOT discard the bolts, as they will be used to attach the mud flap. 7 Set the running board on the braces and attach the flap to the wheel well using the previously removed bolts.
8 Align the running board with the cab board. Once the side box board is align with the cab board, clamp the running board to the brackets. 9 Using the slots in the brace as a guide, drill a 1/4" hole at each mounting location.
10 Attach the running board to the angle brace using the 1/4" x 1" ribneck carriage bolt [M], 1/4" flat washer [J], and 1/4" hex nut [L]. Tighten using a 7/16" wrench or deep well socket. Tighten the hardware attaching the flap to the running board with a 7/16" socket and wrench. Tighten the hardware attaching the mud flap to the wheel well using a M8 socket/wrench. Repeat process for passenger side.
