INSTALLATION INSTRUCTIONS AND PARTS LIST
APPLICATION:
MODEL 401117 WHEEL TO WHEEL STEP BRACKETS:
1999
GM SILVERIDO& SIERRA REGULAR/EXTENDED/CREW CAB PICKUPS
1.
READ INSTRUCTIONS COMPLETELY AND CHECK TO MAKE SURE THAT ALL REQUIRED PARTS
(LISTED ON THE SERVICE PARTS LIST) ARE ON HAND BEFORE STARTING THE INSTALLATION.
2.
ASSEMBLE THE LOAD REACTION STUDS AND HARDWARE (ITEM#8 THRU #11) AS FOLLOWS:
2.1
ON THE SHORT THREADED END OF THE LOAD REACTION STUD (ITEM #11), INSTALL A
BLACK 3/8” SERRATED FLANGE NUT (ITEM #10) BACKWARDS TO THE BOTTOM OF THE
THREAD. THEN, INSTALL A BLACK 3/8” FLAT WASHER (ITEM #9) AND RUBBER “CUSHION”
WASHER (ITEM #8) TIGHT UP AGAINST THE SERRATED FLANGE NUT. (THE END OF THE STUD
MUST BE RECESSED IN THE RUBBER WASHER, APPOX 3/16”).
2.2
ON THE LONG THREADED END OF THE STUD, INSTALL A BLACK 3/8” SERRATED FLANGE NUT
(ITEM #10) BACKWARDS TO NEAR TO THE BOTTOM OF THE THREADS.
3.
ATTACH THE LOAD REACTION STUD ASSEMBLIES TO THE BODY MOUNTING BRACKETS AS
SHOWN.
NOTE: IF YOU ARE MOUNTING THE STEPS ON A 1500 MODEL PICKUP, YOU MUST ATTACH
BRACKET (ITEM #14) TO BRACKETS (ITEM #1 &2) (SEE FIG 1) IN ORDER TO USE THE LOAD
REACTION STUD.
3.1.
INSERT THE STUD, FROM THE INBOARD SIDE OF THE BRACKET THRU THE LOWEST HOLE IN
THE BENT FLANGE THAT WILL ALLOW THE RUBBER WASHER TO SET FIRM AGAINST THE
SIDE WALL OF THE FRAME. INSTALL A BLACK FLANGE NUT (ITEM #10) ON THE OUTBOARD
END OF THE STUD (FINGER TIGHT ONLY).
NOTE:
DUE TO EXCESSIVE THREAD LOCKER IN THE BODY MOUNT BOLT AREA ON THE 2010+ GM
SILVERADO/SIERRA, USE CAUTION WHEN REMOVING THE BODY MOUNT BOLTS TO REDUCE
THE RISK OF CAUSING DAMAGE TO THE THREADED INSERTS INSIDE THE VEHICLE.
4.
REMOVE THE FACTORY FRONT, CENTER, AND REAR BODY MOUNT BOLTS (ONE SIDE OF THE
VEHICLE AT A TIME) AND INSTALL THE MOUNTING BRACKETS PER THE FOLLOWING
INSTRUCTIONS.
4.1.
INSTALL THE FRONT MTG BRKT (ITEM #1 & #2) TO THE FRONT CAB MOUNT AS SHOWN
(LEAVE THESE FASTENERS FINGER TIGHT).
4.2.
INSTALL THE CENTER MTG BRKT (ITEM #3 & #4) TO THE CENTER CAB MOUNT AS SHOWN
(LEAVE THESE FASTENERS FINGER TIGHT).
4.3.
INSTALL THE REAR INBOARD MTG BRKT (ITEM #7) & WASHER (ITEM #13) TO THE REAR CAB
MOUNT AS SHOWN (LEAVE THESE FASTENERS FINGER TIGHT) (EXTENDED AND CREW CAB
ONLY).
REV C 30MAR18
REV B 05MAR12
REV A 13OCT10
551874 SHEET 1 OF 4 27JUL10
