Poison Spyder JK BFH II User manual

©2015 POISON SPYDER CUSTOMS 951-849-5911•WWW.POISONSPYDER.COM
INSTALLATION INSTRUCTIONS INST-17-17-021_A
JK BFH™ II Rear
Bumper
IMPORTANT: Thank you for purchasing this Poison Spyder product. Please read through this entire document before proceeding with installation. If you are not
confident in your mechanical skills, please seek the help of a professional to perform the installation. Check your packages immediately upon arrival to ensure that
everything listed is included, and to check for damage during shipping. If anything is missing or damaged, or if you need technical assistance with any aspect of
this installation, call Poison Spyder at [phone] as soon as possible. This document last updated November 2015.
APPLICATIONS
These installation instructions apply to the following
Poison Spyder products:
17-17-021-D JK BFH™ II Rear Bumper - Tabs
17-17-021-DL JK BFH™ II Rear Bumper - Tabs - Lights
17-17-040-D JK BFH™ II Rear Bumper - Hitch - Tabs
17-17-040-DL JK BFH™ II Rear Bumper - Hitch - Tabs - Lights (Shown)
PARTS LIST
Please check your packages immediately upon arrival
to ensure that everything listed is included, and to
check for damage during shipping. If anything is
missing or damaged, call Poison Spyder at (951) 849-
5911 as soon as possible.
(1) JK BFH™ II Rear Bumper
(1) JK BFH™ II Rear Frame Cut Template
(1) JK BFH™ II Rear Bumper Hardware Kit
PN: HWKIT-17-17-020 includes:
(4) 3/8-16 X 1 Gr8 hex head cap screw
(4) 3/8 SAE Hardened Flat Washer
(2) 3/8-16 Extruded U-Nut Clip
(2) 3/8-16 Serrated Flange Nut
TOOLS NEEDED
• Reciprocating saw with bi-metal blade OR pneumatic cut-
off wheel OR plasma cutter OR similar tool for cutting metal
• Mechanic’s tool set with an assortment of wrenches,
sockets, etc.
• Angle grinder
• Drill motor with 1/4” and 1/2” drill bits
• Fine-tip felt marker
• Primer and paint
BEFORE YOU BEGIN
The Poison Spyder Customs BFH II Rear bumper
comes as unpainted, bare steel. You will want to
either powder coat or paint the bumper prior to
nal installation, however it is recommended that a
complete installation be performed rst, with the bare/
unpainted bumper to ensure tment without damaging
the paint or powder coat nish. Poison Spyder
Customs is NOT RESPONSIBLE for paint or powder
coating costs, damage to paint or powder coating,
or costs associated with inadvertently painting or
powder coating components that are defective or were
shipped or assembled in error. It is the customer’s
responsibility to pre-install and verify that all parts are
correct prior to paint or powder coat.
IMPORTANT: It is highly recommended to install
the Poison Spyder JK BFH II Rear Crossmember
in conjunction with this bumper. However, at the
installer’s discretion, the JK BFH II Rear Bumper
may be installed by itself, without the replacement
crossmember. Note that this will leave the Jeep without
the full strength of an intact rear crossmember, and the
installer does so at his/her own risk. Poison Spyder
makes no warranty for the integrity of the Jeep’s frame
on JK BFH II Rear Bumper installations where the JK
BFH II Rear Crossmember was not properly installed.
INSTALLATION PROCEDURE
NOTE: The rst 10 steps of the instructions provided
here are for those who intend to install this bumper
WITHOUT the Poison Spyder JK BFH II Rear
Crossmember. If you ARE installing the JK BFH II Rear
Crossmember, install it rst, following the instructions
that came with the crossmember, then skip past the
steps that are duplicated here (marking and cutting
the crossmember).
1. Park the Jeep on a flat, level surface and set the
parking brake. You will want to wear eye protection
beyond this point in time.

©2015 POISON SPYDER CUSTOMS 951-849-5911•WWW.POISONSPYDER.COM
POISON SPYDER CUSTOMS INST-17-17-021_A • JK BFH™ II Rear Bumper 2
2. Remove existing rear bumper.  Keep the OE
hardware that attached the bumper to the frame rails, as
some of it will be re-used.
3. Attach the provided JK BFH II Rear Frame Cut
Template (laser cut from steel plate) to the side of the frame
rail, using two of the OE bumper bolts as shown in the
following photo. Make sure that the template is exactly
aligned with the frame rail as the bolts are tightened. In
other words, the top and bottom edges of the template
must be parallel with the top and bottom of the frame rail.
4. Use a light-colored felt-tip marker or scribe to
mark a cut-line along the diagonal edge at the rearward
end of the cut template.
5. Continue marking the cut-line over the top surface
of the frame rail. Use a square to ensure that the cut-line
is exactly perpendicular to the outer edge of the frame
rail. Use the same technique to continue the cut line on the
bottom of the frame rail.
6. Repeat the cut-line marking process for the other
frame rail.
7. Use a torch, plasma cutter, pneumatic or electric
cutoff wheel, reciprocating saw, or the cutting device of
your choice to cut the outboard, top and bottom surfaces
of each frame rail along the cut-lines made in the previous
steps.
8. If not installing the Poison Spyder JK BFH II Rear
Crossmember, we recommend leaving as much of the rear
crossmember intact as possible. However, a significant
portion of its rear-lower corner will have to be cut away to
provide clarance for the JK BFH II Rear Bumper. Use your
best judgement to cut away a section of the crossmember
along the same plane as that defined by the cut-lines on
the frame rails. It would be best to be conservative in your
initial cuts, cutting away as little as possible, then test-fit the
bumper, then cut a little more, until the bumper fits without
interference with the remaining crossmember. OPTIONAL:
at the installer’s discretin, a piece of flat plate steel may be
cut to fit over the cut crossmember and welded in place to
reinfoce the integrity of the crossmember.
Note that the following photos depict an installation
along with the JK BFH II Rear Crossmember, however
the procedures henceforth are the same regardless
of whether the replacement crossmember has been
used.
9. Withthehelpofafriend, lift the BFH II Rear bumper
into place, over the cut ends of the frame rails.

©2015 POISON SPYDER CUSTOMS 951-849-5911•WWW.POISONSPYDER.COM
POISON SPYDER CUSTOMS INST-17-17-021_A • JK BFH™ II Rear Bumper 3
10. Re-install two of the OE bumper bolts on each side,
through the holes provided on the bumper’s mounting
plates into the existing threaded holes in the side of the
Jeep’s frame rail. Do not fully tighten them yet.
11. Insert a 3/8-16 X 1 Gr8 Hex Head Cap Screw (with
3/8 Gr8 Flat Washer) through the hole on the bottom of
the BFH II Rear Bumper where it fits over the frame rail.
Insert a 3/8-16 Gr8 Serrated Flange Nut through the
large oval hole on the side of the bumper’s mount plate,
and thread it on to the bolt that was inserted from below.
It will be possible to hold the nut in place with a finger,
but not possible to reach it with a wrench. The serrations
on the bottom of the flange will work to keep the nut
from spinning as the bolt is tightened with a wrench on
the outside/bottom of the bumper. Install and tighten this
hardware on both sides of the bumper.
12. Tighten the 4 OE bumper bolts (2 per side) that were
loosely installed in a previous step.
13. Note the third bolt hole in the mounting flange, just
above and rearward of the oval-shaped hole on either
side of the bumper. On some JK’s there may already be
a hole in the frame rail at that location, on one or both
sides. If not, use a felt-tip pen or auto-punch to mark the
location of the third bolt hole on the frame rail, for each
side. Make sure your mark is centered in the hole in the
mounting flange.
14. Removethebumper.
15. Drill through the crossmember on each side (if
necessary), at the third bolt hole locations marked in a
previous step. Start with a smaller drill size such as 1/4”,
as a pilot hole. Then step up to the 1/2” bit for the final
hole size. Use a file, grinder or sandpaper to de-burr the
edges of the holes.

©2015 POISON SPYDER CUSTOMS 951-849-5911•WWW.POISONSPYDER.COM
POISON SPYDER CUSTOMS INST-17-17-021_A • JK BFH™ II Rear Bumper 4
16. Primer and paint any bare metal from cutting and
grinding the frame rails and crossmember, as well as the
bare metal along the inside surface of any holes that were
drilled.
17. Install the supplied 3/8-16 Clip-Nuts into each
frame rail. Slip the clip-nut through the existing oval-
shaped hole, and lodge the extruded barrel of the clip nut
into the nearby 1/2” hole that was drilled in the previous
step. Make sure the extruded side of the cli-nut is oriented
toward the inside of the frame rail and the flush side of the
cli-nut is along the exterior surface of the frame rail.
18. Paint or powder-coat the bumper in the color of
your choice. If painting yourself, careful preparation will
make a big difference in the quality and longevity of your
paint job, even using “rattle can” aerosol paints. Begin by
thoroughly cleaning the bumper with solvent or de-greaser,
then make sure all residue is removed. Even if you use
cheap paint, try to use a good quality primer. “Etching”
primers are best to use on bare, unpainted metal. Allow it
to properly dry before painting, and between paint coats.
19. IfyourJKBFHIIRear Bumper came with the optional
integrated light bar mounts, mount them inside the bumper
using the tabs provided, making sure that wiring is
accessible to complete the connections after the bumper
has been installed.
20. Re-install the bumper using the hardware that
was used in the pre-installation process. Finish by adding
a 3/8-16 X 1 Gr8 Hex Head Cap Screw, with 3/8”
Hardened Flat Washer, through the hole in the mounting
flange on each side of the bumper, into the clip-nut that
was installed in a previous step.
21. If LED light bars were installed in the light pockets,
finish wiring them according to the light bar manufacturer’s
specifications.
Congratulations, you have installed your Poison
Spyder Customs JK BFH II Rear Crossmember!
You may now either use your Jeep with only the
Crossmember as a “minimalist” bumper, or you may
proceed with installation of the Poison Spyder JK BFH
II Rear Bumper!