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ManualsBrandsPoison Spyder ManualsAutomotive17-17-030 BFH II Rear Crossmember Fits 07-18 Wrangler (JK)

INSTALLATION INSTRUCTIONS INST-17-17-010_A

JK BFH™ II

Rear

Crossmember

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 (951) 849-5911 as soon as possible. This document last updated August 2015.

APPLICATIONS

These installation instructions apply to the following

Poison Spyder products:

17-17-010 JK BFH™ II Rear Crossmember

17-17-030 JK BFH™ II Rear Crossmember - Reciever (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 Crossmember

(1) JK BFH II Rear Frame Cut Template

TOOLS NEEDED

• Reciprocating saw with bi-metal blade OR pneumatic cut-

off wheel OR plasma cutter OR similar tool for cutting metal

• Welder

• Mechanic’s tool set with an assortment of wrenches,

sockets, etc.

• Angle grinder

• Light-color ﬁne-tip felt marker or scribe

• Primer and paint

BEFORE YOU BEGIN

NOTE: The JK BFH II Rear Crossmember may be

installed by itself and used as a “minimalist” high

clearance bumper, or a Poison Spyder JK BFH II

Rear Bumper may be installed over it. Procedures for

installing the bumper are not covered here—they are

provided with the bumper.

This item comes as unpainted, bare steel. You will

need to paint the crossmember after installation.

IMPORTANT: The reciever tube built into part number

17-17-030 is not rated for towing on public highways.

Do so at your own risk. It is provided as a convenience

for short non-highway tasks such as launching a boat

or moving a trailer on private property. Most standard

reciever hitches will not t through the reciever tube

without being shortened.

INSTALLATION PROCEDURE

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.

2. Removeexistingrearbumper.Ifa JK BFH II Rear

Bumper will be installed after installing the crossmember,

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.

Summary of content (4 pages)

PAGE 1
INSTALLATION INSTRUCTIONS INST-17-17-010_A JK BFH™ II Rear Crossmember 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.
PAGE 2
POISON SPYDER CUSTOMS INST-17-62-020_A • JK BFH™ II Rear Crossmember 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. 2 8. Note that the rear-most body mounts attach to the rear crossmember on either side. A cut will have to be made along the seam where they join, to separate the crossmember from the body mount. Cut away only the crossmember—LEAVE THE BODY MOUNT IN PLACE.
PAGE 3
POISON SPYDER CUSTOMS INST-17-62-020_A • JK BFH™ II Rear Crossmember 11. Re-use the steel Cut Template to make the cutlines on the inboard side of each frame rail. There are no bolt holes on the inboard side, but the template can be manually aligned with the oval-shaped hole and the hole that slightly intrudes into the diagonal cut line.
PAGE 4
POISON SPYDER CUSTOMS INST-17-62-020_A • JK BFH™ II Rear Crossmember 4 or sand away paint and residue from the cut ends of the frame rails where the crossmember will be welded. 17. Re-position the crossmember, again checking for straightness in relation to the Jeep’s frame, and tack into place. After a final check that it is straight and plumb, fully weld around all seams and edges where the crossmember meets the frame rails. 18.