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Old 01-18-2010, 09:04 PM   #1
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TJ frame vs. YJ frame

what are the differences between the 2? obviously the suspension mounting points are different, but what about other stuff? is one wider/longer? any photos you have of just the frame would be cool for comparison.

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Old 01-19-2010, 02:31 AM   #2
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nothing on the frame is different but the link mounts. that's it. some minor things as well, also depends on 4 vs. 6 cyl. i designed comp crushers and tuck skids for both and there isnt really any difference accept the link mounts.

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Old 01-19-2010, 02:33 AM   #3
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you got a pm coming your way punkafi
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Old 01-20-2010, 03:48 PM   #4
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bump
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Old 01-20-2010, 09:49 PM   #5
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I spent like 2 hours searching or stuff and only found these

TJ



YJ

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Old 01-20-2010, 09:55 PM   #6
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Vaultzz, i could just bout kiss ya for that. those yj frame dimensions are insanely helpful. now if i can find that same thing for a tj, it would be golden
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Old 01-20-2010, 09:56 PM   #7
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They are very similar... but the YJ frame has more in common with a CJ than a TJ, especially in the strength area.
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Old 01-20-2010, 09:57 PM   #8
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Old 01-20-2010, 10:02 PM   #9
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y'all have no idea how happy this makes me. now its time to break out the calculator and such and do some math
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Old 01-20-2010, 10:04 PM   #10
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Are you trying a body swap or something?
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Old 01-20-2010, 10:10 PM   #11
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not quite. im trying to see if it is possible to do brute conversion with a YJ. i already know the cab close out and hard top are a no go, but i have also found a way around that. the only part im not sure of is the frame extensions. i posted some stuff up on the AEV forum to see if they had any ideas. however they had no idea if it would work. although that doesnt quite surprise me, since they dont make any thing for the YJ i didnt think they would be very familiar with them

so Dave (the owner of AEV) suggested i do a but load of research and such, looking at the 2 frames, measurements and all. and i figured id ask here to pick ppls brains a little
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Old 01-20-2010, 10:19 PM   #12
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So you're planning a to get the Brute kit for a TJ and make it work for a YJ?

I think the biggest issue is WHERE the frame extentions go for the TJ frame. is it before or after the 3rd body mount? I'm more than positive, if you can get a good frame shop, they can section in a piece long enough for you. No need to work with a kit made for another truck.
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Old 01-20-2010, 10:25 PM   #13
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well i wouldnt be getting the whole kit. and i would still want the rear frame extensions. and the only way i can get those are with the mid frame extensions.

in fact, if the frame extensions work, all the parts i need to do everything including the cab close out and top, would come out to almost 2 grand cheaper, if not more, then the whole brute kit

ive definitely been thinking about where they go. i figure first i want to see how similar the frames are, then get into it a little deeper, and get under my friends' tj, pull some measurements, and find a yj to do the same on. and that way i could get and idea of alternative places to extend the wheel base. im weird and have to be able to see and touch/feel something to figure if i can make them work
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Old 01-20-2010, 10:38 PM   #14
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I understand, and I'm the same way. I think if you had some good images of a Brute frame all done, it would be easy to figure out. Seeing as how straight the YJ frame is in the rear, I really don't think it's as complicated as mot people believe it to be. If it were me, I'd cut the frame at the back of the "cab" and just use some stock steel to make a new frame. Seeing as a YJ is leaf springs, that makes it soo much easier. You could possible spring over the axles and probably be able to retain a stock ride height.

As far as the cab goes... what are you planning there? I know a Scrambler top fits YJ's, but what about the bulkhead below the top?
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Old 01-20-2010, 10:46 PM   #15
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the scrambler top fits? i did not know this.............

i was planning on getting ahold of the gr8tops half top for the yj, that comes with a close out kit, then i would be cutting out the rear corners of the yj tup, and use those to get a nice curve around and just close anything else off with what ever i have laying around.

in theory, it should be like what i did when i was doing body work on cars through school. and the nice thing is since i wouldnt be buying a whole brute kit, i could do it all in pieces, which is alot easier on the wallet. it would take longer, but thats ok

and yeah, i figured while i was doing all that work, go to spring over, throw a ford 8.8 out back, and go with 33s
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Old 01-20-2010, 10:52 PM   #16
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Yeah, YJ's and CJ's share the same windshield and the tops fit. I've seen a number of YJ's with CJ8 tops.. I forgot about Gr8tops though. Probably be easier and cheaper than finding a CJ8 top. I think you're heading in the right direction though.

Keep us updated!

YJ with CJ8 top...
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Old 01-20-2010, 10:55 PM   #17
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oh id be doing a whole build thread. but first i want to be absolutely sure it would work. so it may be a bit. even after the acquisition of a jeep. cause i would probably pull the body off and fix up the frame real nice, so after its stretched, i could paint/powder coat it up and make it real pretty.
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Old 01-20-2010, 11:02 PM   #18
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It'll work... but I'm betting you it'll be easier on you to buy the bed and just do a simple frame on your own instead of using all the AEV "extensions".
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Old 01-20-2010, 11:10 PM   #19
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the frame extension bit yeah. but i still want the AEV rear frame extension. it has a winch mount built in, and a hitch receiver. and it also functions as the rear bumper. so i figure it would work instead of making my own that has all that incorporated into it
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Old 01-20-2010, 11:21 PM   #20
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Possibly.
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Old 01-20-2010, 11:26 PM   #21
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and since it would make work easier for me. i want to do as much as this as i could. as of right now, the only thing i would farm out is the frame stretch. everything else i can do in my garage/driveway

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