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post #1 of (permalink) Old 08-24-2002, 05:22 PM Thread Starter
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Traction bar bracket template(PIC)(UPDATE)

I've made some progress on my traction bar. The crossmember is pretty much done except for some touch-up welding/grinding. Hopefully it'll hold[img]images/icons/wink.gif[/img] Now I've moved onto the bracket for the axle. I made a template on some cardboard and will have to wait a day or two for my buddy to help me cut it out with his torch. I just thought I'd post it and see if anyone has some thoughts on it. I'm a little nervous after reading Tom's write-up. His traction bar contacted his shocks at full flex. I don't have a cantilever setup at the moment, but plan on it in the near future. I know it's hard to judge from the picture, but do you guys think it'll work? I tried to keep it somewhat short, but also keep the bottom mount up and out of harms way. You'll notice on the template there's a line on the bottom. That will be the level line, so the front of the bracket will have a 25 degree slop upward. Make any sense?
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post #2 of (permalink) Old 08-24-2002, 05:45 PM
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Re: Traction bar bracket template(PIC)

Hey Jammy,
That looks alot like my template. I allowed 6" center to center for the bushings and left 1/4" additional material around the edge for protection. The front of my bracket is almost perpindicular to the ground. I think it will be hard to have a cantilever setup and not have contact issues. I have thought about moving my bar toward the pumpkin outside my brackets and running a bolt all the way through from the outside. That would give me a couple more inches of clearance and would allow the brackets to remain on the tubes. The only issue with running the bar outside the brackets is that it puts more stress on the bolts. I am going to see if I can move the top of my shock over to get some more clearance. If that doesn't work, I will try the long bolts, and then welding to the pumpkin.

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Tom
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post #3 of (permalink) Old 08-24-2002, 06:16 PM Thread Starter
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Re: Traction bar bracket template(PIC)

Your bracket appears quite tall. How far is the top mount from the axle tube? Let me know and I'll measure mine. Mine appears a bit shorter than yours, so hopefully that will solve the shock problem. BTW - What kind of bracket did you buy/make for your shock mount on your axle tube. And what does the upper mount look like? One more question, I'm using a Johnny Joint up front like yours, but my JJ is a bit narrower than the bushing I'll be using in the shackle, so I'll have to make a custom bent shackle. How'd you solve this? Thanks Tom! Any tips on fabbing the actual traction bar itself?
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post #4 of (permalink) Old 08-24-2002, 07:42 PM
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Re: Traction bar bracket template(PIC)

James you want that lower mounting point low as possible if it is too high then you have the same thing as a single bar, single mounting point traction bar and it won't eliminate spring wrap..... I may be looking at it wrong....
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post #5 of (permalink) Old 08-24-2002, 08:26 PM
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Re: Traction bar bracket template(PIC)

Steve, you could put the bottom link 2 feet above the axle and it would still work. There will be more shear transfered through the welds at the top of the axle and the bracket extending up 2 feet will have a large bending moment to resist but it will still work.

As long as the bracket is solidly attached to the axle and the track bar attaches to the bracket in two places seperated vertically, the axle cannot rotate.

Just pick a point and sum moments.
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post #6 of (permalink) Old 08-24-2002, 08:30 PM
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Re: Traction bar bracket template(PIC)

Might work if the bracket attached low enough.... If you put both links above the axle and the braket above the axle you would still get wrap. You have to have something attached to the bootom of the axle tub to stop the springs from wraping. Other wise you are only stopping movement at the top.
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post #7 of (permalink) Old 08-24-2002, 08:43 PM Thread Starter
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Re: Traction bar bracket template(PIC)

I still think having two links, and triangulating it makes it work. If I had two bars vertically stacked on top of my axle, it still wouldn't allow it to twist....or would it? I'm confused thinking about this. We need some more people ot chime in or some more in depth explantions. Is my template crap? Will it not work?
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post #8 of (permalink) Old 08-24-2002, 09:11 PM
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Re: Traction bar bracket template(PIC)

I say that both links can be above the center line of the axle. the real force keeping the axle from twisting is between the 2 links on the axle side. as long as they are separated and not allowed to get any closer to each other, the axle will not wrap.
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post #9 of (permalink) Old 08-24-2002, 09:12 PM
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Re: Traction bar bracket template(PIC)

Actually Will is right if you have two points it would eliminate wrap but mounting the points above the axle tube would greatly increase the likelyhood of sheering them off. I had a buddy that made a bracket that attached to the top of the axle tube and I was thinking it didn't prevent his springs from turning into S's but it did. It also tore a chunck out of his axle tube when it sheared off. It was a Suzuki with stock axles but also a stock motor. Just make sure the lower mount is at or below the centerline of the axle tube and it should be fine. I don't have the formulas for working out the torque load handy but from building the 4 link recently I do remember that the higher you get your lower mounts the greater the torque multiplies on that point (traction bar would be the same way).
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post #10 of (permalink) Old 08-24-2002, 09:23 PM Thread Starter
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Re: Traction bar bracket template(PIC)

So then I need to redo this template? The way I have it, my bottom mount is just about right at the top line of the axle tube, and the top mount is about directly above the axle tube.
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