Extending chassis to LWB - JeepForum.com
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post #1 of 6 Old 03-25-2012, 04:45 AM Thread Starter
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Extending chassis to LWB

Hey. I'm doing a bit of research into extending my TJ to 116" wheelbase for the extra stability on climbs and a decent boot space. I work at a panel shop so getting the tub extended is no problem but I'm a bit worried about the strength of the chassis with such a long stretch. My plan to extend it was to cut it between the control arm mount and TC skid and then get the same size steel for the extension and then the size smaller to slide into the chassis extension and hanging out about 10cm on each end. Then drill some holes in the chassis and chassis extension piece and plug weld it to the smaller piece and then weld the chassis together. I've seen a lot of people do it this way with success but mostly a smaller stretch to LJ length (15" stretch compared to my ~20"). So basically my question is will this method work correctly with a longer stretch or should I be adding cross members or doing external sleeves as well or what?
Thanks for any help.
PS if its not advanced enough please move to appropriate section.

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post #2 of 6 Old 03-25-2012, 09:32 AM
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Havent really heard of too many people stretching that way just for wheel base. I assume it would be fine as long as your fabrication work is sound without any extra cross members... Of course you ll def have to be lengthening all the appropriate lines ie fuel, brake, and RDS. Why go through all the trouble of lengthening the tub when you can just do a standard rear stretch and comp cut it?

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post #3 of 6 Old 03-25-2012, 05:18 PM Thread Starter
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I want the extra space in the back so I can take more than one person camping and a comp cut is very noticeable even if you've never seen a jeep. If I do this well it will look factory and hopefully won't get bothered by the police. I also don't want a fuel cell because that takes up a lot of room.
I was planning on getting it professionally welded because my weldings not to good. I know I have to extend all the lines as well but that's pretty simple.
Thanks for your help.

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post #4 of 6 Old 03-25-2012, 05:29 PM
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this was the same plan i had. i decided to turn the project around and do the front first but the rear will come into play later. i got a donated frame and cut sections out of it and premade inserts. my original idea was for a foot of extension. as i photoshopped the various lengths the plan got shorter and shorter. 116 is incredibly long. you have to watch out for the limo look. i think mine will be in the 6-8" range. people suggested just getting an unlimited tj or compcutting. i didnt want the long rear and the wheelbase stretch itself was only a byproduct of stretching the tub and not the goal in itself. right now im stretched 5" in the front so i have to be careful to keep the wheelbase within reason for the tire size.

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post #5 of 6 Old 03-25-2012, 05:41 PM Thread Starter
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Google jeep t1. its a 116" stretched tj. They don't sell unlimited here so that's a no go. I'm planning on 37s and a tummy tuck and the terrain here is basically rutted out hills so the ramp over will be no problem. And a stretch this size means I can have 4 people with camping gear comfortably. The hard part im finding is getting some tj frame from somewhere. no wreckers seem to have a tj. I'm not planning on stretching the front at all since it is already a large stretch.
My other option was a 111" wheelbase with lj overhang but then I have to do two cuts and have a bigger overhang but it might have less of a link look and still retain the boot space needed.
Any thoughts?

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post #6 of 6 Old 03-25-2012, 07:49 PM Thread Starter
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