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Unread 03-17-2007, 02:20 PM   #1
mudmonkey2400
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Too much flex!

Well, I put off limiting straps too long. Last night at Windrock on the end of Trail 15 (Little Mule) after a good rain, I finally flexed it out enough so that my front spring fell out. I heard it fall out onto a rock, then roll down the hill, making the an unbelievably loud CLANG. Thought my front driveshaft came loose.

Anyways, all the limiting straps I've found including the brackets, seem to cost way too much for what they are, and what their purpose is. Anyone ever thought about just using galvanized cable and cable clamps (looks similar to small u-bolts)? All that would need to be supported would be the weight of half the axle, the wheel, tire, etc, right? Would cable (1/4" to 5/16") with a 500lbs breaking strength work, you think? Over kill, or underkill? Seems like this would be a simple, cost effective measure for limiting down travel. (don't wanna strench out the YJ brake line on the passenger side)

I also plan on getting a coil retainer for the passenger side (I guess 2000's just came with one on the front axle.

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Unread 03-17-2007, 06:11 PM   #2
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Yeah, that would probably work. I've seen people use chain as well, but it's a little noisier. You just have to make sure it's not going to catch anything that's supposed to move, and you're fine.
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Unread 03-18-2007, 05:14 AM   #3
BluesMan
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500lbs seems way to light?
My knowledge in this area is limited however the weight of the front axle would be multiplied many times over with articulation. Lever principle.
Someone please confirm or tell me I'm full of it.
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Unread 03-18-2007, 06:28 AM   #4
mudmonkey2400
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Quote:
Originally Posted by BluesMan
500lbs seems way to light?
My knowledge in this area is limited however the weight of the front axle would be multiplied many times over with articulation. Lever principle.
Someone please confirm or tell me I'm full of it.
Soon as the spring drops out of the spring bucket though, there's no down force being applied though, right? Essentually, the that axle side is just hanging there?
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Unread 03-18-2007, 02:56 PM   #5
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what about installing a bracket on your diff gaurd to hook your winch too then just suck up your axle with the winch? Same could be done with a small atv winch on the back...

or maybe im just having dumb ideas
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Unread 03-18-2007, 09:24 PM   #6
doug_1994
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Why not swap to leaf springs?
















































J/K

Maybe some captures to hold the spring in?
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Unread 03-19-2007, 06:34 AM   #7
mudmonkey2400
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Quote:
Originally Posted by frumpy
what about installing a bracket on your diff gaurd to hook your winch too then just suck up your axle with the winch? Same could be done with a small atv winch on the back...

or maybe im just having dumb ideas
That would probably stop the axle from drooping too far if I was jumping something, but I don't think it would do much for flex, where one side of the axle moves at a time.

Quote:
Maybe some captures to hold the spring in?
Going tommorow to pick up some from the dealer.
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Unread 03-19-2007, 07:12 AM   #8
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I think it would limit it. I'll try to explain this but maybe im just talking out of my ***.

Say you have one wheel on an rti ramp and one on the ground. Your going to be using the wheel on the ramp as your teeter point, from there is where it controls a lot. However, if you move the limiting point to the centre of the axle, it will only allow the axle to droop so much.

More or less, when you flex the centre of your axle drops. If you limit how much it can drop you are limiting your flex? right or no?
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Unread 03-19-2007, 08:15 PM   #9
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Quote:
Originally Posted by mudmonkey2400
Soon as the spring drops out of the spring bucket though, there's no down force being applied though, right? Essentually, the that axle side is just hanging there?
The weight of the axle plus the weight being applied at the other spring on the axle has to be supported. Most of that is supported by the tire on the low end of the axle ,but the rest would have to be supported by your cable. Depending on the angle your axle is at determines what weight must be supported by your cable vs the other tire that is still on the ground. Bottom line, your cable could be supporting more than half the weight of the axle or much more.
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Unread 03-25-2007, 01:04 AM   #10
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I know most of the time the droop is going to be slow but on the off chance that the drop occurs quickly you would need a thick enough cable to support the weight dropping.

Something else you may want to consider is the abrasiveness of the steel cable. It could wear parts causing a leak or other problem depending on what the cable is wrapped around, or rubbing against.
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Unread 03-25-2007, 04:01 PM   #11
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Why not just use a nylon strap, AKA 2500lb rated ratchet strap with out the ratchet part on it.
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Unread 03-25-2007, 07:27 PM   #12
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Anyone on my idea or am I just crazy?
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Unread 03-25-2007, 08:04 PM   #13
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Yer crazy frumpy.

I have seen rockcrawlers do that to keep the front from unloading and causing them to flip over. I don't think it would work to well in that it would limit the axle movement. With the way it is now the rotation point is the opposite spring allowing for longer droop than if you made your rotation point a spot in the middle of the axle. it would be similar to a vehicle with independent front suspension. Solid center with the axle pivoting up and down on the ends. Also, I think it would be a hassle if you wanted the winch for pulling your rig out of a bad spot yet that spot would be in a place that you could over flex and lose the spring again.

I think the best option for the OP would be to just shell out the money for the proper limitting straps with quality mounting points. I think the advantage of them would be that they will work to limit regular droop, yet has some stretch in it to allow for a sudden drop without causing damage.
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Unread 03-26-2007, 01:10 AM   #14
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if the passenger side of the axel is flexing down, all the weight from the front of the jeep is gonna be on the drivers side wheel, thus forming a lever, as bluesman said. the passenger side will be pushing down with as much force as the dirvers side is pushing up with. if you see what i mean...
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Unread 03-27-2007, 02:15 PM   #15
mudmonkey2400
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Thanks for all your help guys. The only thing I don't like about about actual limiting straps is all the ones I've found are non adjustable. With cable, I could flex it out and set my length. I wouldn't need to drill or weld any mounting brackets if I looped the cable around the frame, and the other end looped around the axle tube.

If I did use a plain strap, say from a ratcheting tie down strap, how would I secure it to the frame/axle? Most of them I've seen have hooks at the ends. I don't think I'd feel comfortable tieing a knot in the straps.

Also, anyone have any guess at what lbs. rating the cable or strap should be? I take it everyone's opinion is that 500 lbs minimum breaking strength is too light? What would be a good rating?
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1990 MJ : 2.5L, 5spd, 2wd, short bed and bone stock.
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