A TJ truck build named "Dumpster Dive" - Page 292 - JeepForum.com

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post #4366 of 5952 Old 12-03-2013, 03:31 PM
TechJeeper
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Link to kit please^^^

Edit: found it!

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post #4367 of 5952 Old 12-04-2013, 06:17 PM Thread Starter
Hendrix
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Ok guys, here is the low down.

Jacked up the Jeep from the receiver hitch tonight. Then measured the top of the bed at the cab on both sides. Then rested the Jeep back on its weight. Then jacked the Jeep up and put jack stands in the middle of the Jeep and measured.

Yes, the frame is flexing about a 1/4 at the cab. That means the difference is a lot more from center of the Jeep to the rear bumper.

My professional side says, preload the frame just a little at the section just below the cab in front of the leaf mounts. To do this I need to place 2 floor jacks. One for each rail, some floor anchors or a frame rack to tie the back end at the bumper down. Then weld in the gussets we posted about earlier from just above the leaf eye bolt back about 2" in front of the axle on the frame making a nice triangle.

Am I on the right track?
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post #4368 of 5952 Old 12-04-2013, 08:03 PM
aw12345
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If the frame isn't bowed now, you should be able to weld as is. Little bit of preload wouldn't hurt provided you brace it where it flexes. I would, just put some weight in the back after you set the frame on jack stands just behind or under the cab and just let the back dangle in the air. That's probably all the preload it needs. That's how I stiffened my trailer let it bow one way welded my stiffners in and then took it of the stands fixed it up nice and strong with preload

My Tinkering and wheeling thread http://tinyurl.com/pbwdm5u
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post #4369 of 5952 Old 12-04-2013, 08:24 PM Thread Starter
Hendrix
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That sounds easy enough. Looks like I have a little project for Saturday.
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post #4370 of 5952 Old 12-05-2013, 12:27 AM
ashland82391
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You think your bad ride is from a little frame flex?
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post #4371 of 5952 Old 12-05-2013, 04:41 AM Thread Starter
Hendrix
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Quote:
Originally Posted by ashland82391
You think your bad ride is from a little frame flex?
The ride is not all that bad, it's what happens when I hit larger bumps. It's hard to explain I explained it a few pages back and uploaded a few videos. There is a shake or bouncing effect that follows after hitting anything in the road other than smooth asphalt.
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post #4372 of 5952 Old 12-05-2013, 08:55 AM
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Like whiplash. I think I kinda understand what you mean. Thst would be most annoying.
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post #4373 of 5952 Old 12-05-2013, 09:24 AM Thread Starter
Hendrix
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Quote:
Originally Posted by JJeeper09
Like whiplash. I think I kinda understand what you mean. Thst would be most annoying.
Yeah, more annoying than anything.

Example: take a coil spring and hold it by one end and hit it on the ground. The vibration is what I am talking about, just on a much larger scale.


Example 2: a tuning fork. One made out of 2x3 box tubing . That's basically what I have. I just need to stop it from vibrating.
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post #4374 of 5952 Old 12-05-2013, 10:30 AM
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Quote:
Originally Posted by Hendrix View Post
Yeah, more annoying than anything.

Example: take a coil spring and hold it by one end and hit it on the ground. The vibration is what I am talking about, just on a much larger scale.


Example 2: a tuning fork. One made out of 2x3 box tubing . That's basically what I have. I just need to stop it from vibrating.
The cab cage tied into the bed cage should help with the vibration just like preloading the frame that you mentioned. X under the bed and cage, I bet it is a whole new jeep pick up after that.

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87 MJ Chief 57k original miles... getting built in the backyard. 37s, waggy axles, D300, 6 speed, etc.

Gone - 05 LJ on 37s, 79 FSJ Chief on 38s, 85 CJ-7 on 31s
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post #4375 of 5952 Old 12-05-2013, 07:15 PM
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I definitely like the preload idea. I preloaded my frame before finish welding it and it doesn't budge when I perform the same test as you just did.

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post #4376 of 5952 Old 12-05-2013, 07:45 PM Thread Starter
Hendrix
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Quote:
Originally Posted by dayriesw
The cab cage tied into the bed cage should help with the vibration just like preloading the frame that you mentioned. X under the bed and cage, I bet it is a whole new jeep pick up after that.
I believe I am on the right track now.

Quote:
Originally Posted by Imped
I definitely like the preload idea. I preloaded my frame before finish welding it and it doesn't budge when I perform the same test as you just did.
Live by our mistakes. I have learned a ton on both my last two projects.

I finally ordered my Chromo shafts today for the rear today.
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post #4377 of 5952 Old 12-07-2013, 10:47 AM Thread Starter
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I have one frame stiffener cut out and fit.

Think this will work Art? Going to fill in the triangle with plate after the tube is fully welded.
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post #4378 of 5952 Old 12-07-2013, 02:19 PM Thread Starter
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Got the frame stiffeners welded in, I still need to box them in. I took the Jeep for a drive just now, feels tighter and less bounce. I still think it needs the X in the frame. That will be next, when I can get help removing the bed.
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post #4379 of 5952 Old 12-07-2013, 03:23 PM
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Quote:
Originally Posted by Hendrix
Got the frame stiffeners welded in, I still need to box them in. I took the Jeep for a drive just now, feels tighter and less bounce. I still think it needs the X in the frame. That will be next, when I can get help removing the bed.
I was thinking the same. Get a good solid x brace with those frame stiffeners. Get a little more beef back there.

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post #4380 of 5952 Old 12-07-2013, 04:38 PM Thread Starter
Hendrix
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Quote:
Originally Posted by jforse
I was thinking the same. Get a good solid x brace with those frame stiffeners. Get a little more beef back there.
Got enough DOM to build the X left over from the cage. I think that will work good. Just found enough plate to fill in the triangle on the stiffeners. Might be able to do that tomorrow.
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