Owners manual

POISON SPYDER CUSTOMS INST-17-62-020_A • JK BFH™ II Rear Crossmember 3

11. Re-use the steel Cut Template to make the cut-

lines 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. Also,

ensure that the template is once again parallel with the

frame rail, and even with the perpendicular cut-line that

was made across the top of the frame rail in earlier steps.

12. Use a reciprocating saw or cut-off wheel to cut

each frame rail along the cut-lines made in the previous

steps. For the bottom of the frame rail, simply cut across

perpendicularly between the diagonal cuts on both sides.

13. Once the cuts have been made and the trimmed

pieces removed, de-burr the edges with a grinder or ﬂap

wheel.

14. Test-ﬁt the JK BFH II Rear Crossmember to the ends of

the frame rails. It should extend over the cuts on each side,

to the outside of each frame rail.

15. Some additional grinding may be needed to

achieve a perfect ﬁt. The crossmember will be welded to

the Jeep’s frame rails at every seam and joint, so the pieces

must be closely ﬁtted to achieve the best results. Lay a

straight-edge across the tops of the frame rails in order to

make sure the crossmember is exactly straight in relation

to the frame. The top surface of the crossmember must be

parallel to the top surfaces of the frame rail, both side-to-

side and front-to-back.

16. Once the crossmember is properly ﬁtted, use a

scribe or light colored ﬁne-tip felt marker to mark around

the ends of the crossmember where it joins into the inboard

side of each frame rail. Once this is done, remove the

crossmember and use a grinder or ﬂap-wheel to remove

all paint, undercoating, oil and other residue from the area

to be welded along the line that was made. Also grind