'fast back' CJ style C pillar cage, anyone done this? - JeepForum.com
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Unread 01-09-2015, 06:06 PM   #1
danielbuck
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'fast back' CJ style C pillar cage, anyone done this?

I'm about ready to start working on the cage of my TJ, finally, haha! I've had tube sitting around for a while!

I'm leaving the B pillar factory, and it doesn't look like it'll be to difficult to tie it to the frame. For the A pillar I'm using the poly/synergy pre-bent tube, through the dash down to the floor and tied in to the cage.

For the C pillar, I'm going to cut off the factory C pillar completely, and use straight tube similar to CJs, "fast back" style I guess. And also run a tube horizontally from the b pillar to the c pillar just below the top edge of the tub.

Looking at where the C pillar meets the body, I don't see any real good way to tie that in to the frame. On the driver side there's the filler neck and hoses, and on the passenger side there's the charcoal canister. So I'm thinking about using a large plate on top of the wheel well, and just spreading the load to the body and rear corner guards.

The seats will be a bit lower, and a bit more forward, and mounted to the cage.


Anyway, anyone done a 'fastback' style cage? Any photos of how (if at all?) you tied the C pillars into the frame? Or any other photos/suggestions.


Here's how it is now, and here's a photochop of what I'm going to do behind the B pillar. I'll have some additional triangulation/gussets there, but these will be the main tubes:









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Unread 01-09-2015, 07:00 PM   #2
billiebob
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Very RETRO !!

What about twinning the main b pillar so you don't need to move the seats.
Maybe use a bigger tube on the fastback. Matching the rest.
Can't you anchor to the original c pillar anchor?
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Unread 01-09-2015, 08:04 PM   #3
RnEmOvr
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http://www.pirate4x4.com/forum/jeep-...on-thread.html

some real good info here.
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Unread 01-09-2015, 08:46 PM   #4
jarrodblake
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I did it to my old LJ last spring, miss that jeep. While your at it I would replace the stock front Header Bars, as they will fold up it you ever roll it.

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Unread 01-09-2015, 11:29 PM   #5
danielbuck
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Quote:
Originally Posted by billiebob View Post
What about twinning the main b pillar so you don't need to move the seats.
Maybe use a bigger tube on the fastback. Matching the rest.
Can't you anchor to the original c pillar anchor?

I don't know if I'd want to double up on the B pillar. As for moving the seats, that's more of a seating preference than anything. Right now they are probably 2 inches to high (using the factory seat brackets) and maybe a little to far away. If it looks like headroom is an issue with straight bars for C pillar, then I will put a bend in them right before they hit the B pillar to give more protection.

As for mounting the C pillar, from the factory it's just a small plate on the tub. I was thinking maybe a larger plate to spread the load a bit more, if there's no good/easy way to tie it to the frame.


Quote:
Originally Posted by jarrodblake View Post
I did it to my old LJ last spring, miss that jeep. While your at it I would replace the stock front Header Bars, as they will fold up it you ever roll it.
Yep, the B pillar hoop is the only factory item that's going to stay there. Everything else will be 1 3/4" 120 wall and braced at all major intersections. My photochops are only showing the C pillar here, since that's the part I'm a little unsure of.

What did you do to mount the C pillar, just mount it to the body with a plate like factory?


Quote:
Originally Posted by RnEmOvr View Post
yea I've been going through that thread off and on, good stuff
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Unread 01-10-2015, 04:43 AM   #6
TimV
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I had mine built with a fast back style. None of the factory cage is left though. The B pillar is in the same spot however, because the factory soft top fits perfectly. No issues with headroom for me.
1420890149036.jpg   1420890172363.jpg  
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Unread 01-10-2015, 09:51 AM   #7
danielbuck
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what did you do with the C pillar mount, just a plate on the tub?

That's a stout looking cage, good triangulation!
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Unread 01-10-2015, 10:13 AM   #8
TimV
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C pillar is just a plate. A and B are tied into the frame. The A pillar is actually tied into the rocker guards first, then down to the frame. I'm extremely happy with how it turned out. I hope to never need it, but I feel like I can trust it is I ever do need it.

Lots of triangulation was definitely the goal. As you can probably guess, I have no plans to ever run a back seat. That made the fast back style an easy choice.

I had it built by Zach at A to Z Fabrication. They did a great job getting it done. I thought the price was very reasonable too, considering how many welds, bends, and tube are in it.
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Unread 01-10-2015, 10:17 AM   #9
danielbuck
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Yep, no more rear seat for me, my rear seat and seat belts are already spoken for, so that deed is done. haha

Yours looks very similar to what I'm planning on doing with mine. Like yours, I'm planning on an X on the B pillar, and a V from the B to the A. I'd love to see more photos if you have them. Feel free the PM them to me or post them here if you don't mind

Yours looks alot more stout than most cages, I wouldn't worry about it's strength! I wonder why more cages don't have much triangulation.
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Unread 01-10-2015, 10:42 AM   #10
joe_jeep
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Im doing something similar to my lj.
Using a bikini wrap around windjammer combo.
Kinda 70s pick up look.
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Unread 01-10-2015, 11:13 AM   #11
MisfitSeven
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The old "wrap around."
Sounds nice.
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Unread 01-10-2015, 01:59 PM   #12
hulud44
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im about to do this in a few days. Had some tube bent up for the rear. Was in the process of cutting off the rear C pillar when my grinder blew up on me. Been sitting with half a cage C pillar for a few days now hhahahaa



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Unread 01-10-2015, 02:09 PM   #13
danielbuck
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Right on

Those of you keeping the factory B pillar, are you welding up any bolt holes or other holes in the B pillar that aren't being used? There's alot of holes in mine, LOL Thinking about welding them up.
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Unread 01-10-2015, 02:14 PM   #14
hulud44
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I have the AtoZ sport cage up front. I welded that to the stock B. I also plan on welding the sectional pieces on top the stock B as well.
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Unread 01-10-2015, 02:15 PM   #15
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Quote:
Originally Posted by danielbuck
Right on Those of you keeping the factory B pillar, are you welding up any bolt holes or other holes in the B pillar that aren't being used? There's alot of holes in mine, LOL Thinking about welding them up.
I welded all mine up. Plus I welded the B pillar...it is three separate pieces.
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