What do you guys use to attach a new bumper to the rear cross member

[slickrock]

I am building a new rear bumper and have seen a few different ways to attach the main portion of the bumper to the 40's rear cross member. It looks like most people use some sort of angle iron and bolt it to the cross member and weld the top to the bumper.

What size angle (or cut square tubbing) works the best for this or what other suggestions might you have if you could do yours over, how would you attach it now?

 

[D'Animal]

https://forum.ih8mud.com/hardcore-corner/173702-rear-fj-40-bumper-build.html

 

[Downey]

We build an FJ 40 rear bumper that bolts into the original 8 threaded holes that attached (past tense) the original bump loops. Steel plates are welded to back side of bumper. Socket wrench goes through larger holes in face of bumper.

 

[bsevans]

My bumper uses the mounting holes already available in the frame. I did have to enlarge some for the 1/2" bolts and removed the nuts welded to the inside of the frame for the factory bumpers. After enlarging the holes, the welded nuts came off easily with a chisel and 2 pound engineering hammer. In the second photo you can see the bracket that is welded to the bumper and the 1/2" bolt that attaches it to the frame. The bumper is attached to the frame with 10 1/2" bolts. The bumper is made from 3/8” steel angle with ¼” wall box tubing welded in and capped. The tail lights are protected with a surround of 1/4" plate. The center gusset is 3/8” plate. The D-Rings are - well – large with a ½” base plate welded to the box tubing. The bumper has a receiver that is bolted on using 2 5/8” and 2 ½” bolts. Total weight is 125 pounds.

 

[slickrock]

https://forum.ih8mud.com/hardcore-corner/173702-rear-fj-40-bumper-build.html

Dan, I thnk yours is a great option and would like to take mine this way but I do not have a body lift so I don't know if it will work for me. What do you think?

 

[OinkOinker]

hijack- sorry...

.

why do you have that turck proximity sensor up under your rig? reversing sensor?

 

[camcruiser13]

i cut 2 slots in the cross memeber and then ran some steel form the bumperthrough them and bolted it nicely on the frame. very beefy can get pics if needed

 

[slickrock]

yeah that would be great!

 

[camcruiser13]

ok let me get some then

 

[xjnation]

Any problems pulling if it is only attached to the crossmember and not down the side of the frame??? My crossmember is bowed out about 1/4", but the PO was pulling from the center I assume. If the loads are more spread out.......??

 

[D'Animal]

Should work fine.

Dan, I thnk yours is a great option and would like to take mine this way but I do not have a body lift so I don't know if it will work for me. What do you think?

I like the fact that I can take out 8 bolts and put the bumperettes on if i ever decide to restore it back to stock. You know how I hate modifying things that cannot be undone.

 

[camcruiser13]

thats why i went straight to the frame. it aint moving when i pull a jeep out.

four bolts and its removed

pics coming i swear

 

[Bret]

I took out the rivets and replaced them with bolts/nylocks. There are 2 pieces that come back along the frame rails. In a perfect world the pieces that are bolted to the frame rail would come through the bumper and be a anchor point.

 

[Poser]

What do you guys use to attach a new bumper to the rear cross member ?

Twelve half-inch, grade eight bolts with metal locking nuts....

 

[bsevans]

why do you have that turck proximity sensor up under your rig? reversing sensor?

What proximity senor? Are you referring to the yellow connector and cable? If so go to my ROTW (link in my sig) for more explanation of my rewiring of the tail light connectors and wiring to the bumper.

 

[slickrock]

Thanks for the info. I think some combo of attaching through the cross member to the frame ad using the tubing at 90 degrees welded for vertical support will be the way to go.

Cam, would love to see your pics.

 

[Otterav]

Hello,
My build, with details:
https://forum.ih8mud.com/40-55-series-tech/239002-mutant-bumper-tire-mount.html
eric

 

[slickrock]

What was the size of angle used for the attaching points? IH8MUD Forums - View Single Post - Mutant Bumper/Tire mount

 

[Otterav]

what was the size of angle used for the attaching points? ih8mud forums - view single post - mutant bumper/tire mount

3 x 4 x .500

 

[slickrock]

3 x 4 x .500

What did you get about 2 foot and cut it into sections or less?