Radius arm/coil SAS stability problem?

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Eskimomann209

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Yeah, that's one of the reasons I've been heavy thinking about coil springs. In theory it should ride smoother (get the spring rate right) and the little offroad it would do, it would excel vs leaf springs


The real factor in off road characteristics has nothing to do with leafs Vs COILS.
The difference is determined by how well the planning on the links were.
You can easily build a link system that out performs leafs.
But some systems bind sooner than others.
Radius arms being one of the quickest to do so.
A double triangulated fournlink has zero bind and would whoop ass off road. But is considered squirlly on the road at speeds. ( opinion of some not all)
There are a lot of factors.

Biggest one for me was plan for the best build. But remember there will be a LOT of compromise.
There is formulas for everything.
Axle
Side separation is a percentage of planned tire size. Frame side is 1/2 the separation of axle side.
You want to figure your link length as long as you can. But is recommended if mounts where your driveline does. It helps with the pivoting there.
 

CarolinaOBS

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The real factor in off road characteristics has nothing to do with leafs Vs COILS.
The difference is determined by how well the planning on the links were.
You can easily build a link system that out performs leafs.
But some systems bind sooner than others.
Radius arms being one of the quickest to do so.
A double triangulated fournlink has zero bind and would whoop ass off road. But is considered squirlly on the road at speeds. ( opinion of some not all)
There are a lot of factors.

Biggest one for me was plan for the best build. But remember there will be a LOT of compromise.
There is formulas for everything.
Axle
Side separation is a percentage of planned tire size. Frame side is 1/2 the separation of axle side.
You want to figure your link length as long as you can. But is recommended if mounts where your driveline does. It helps with the pivoting there.

Thanks for the insight! Much appreciated. I’m planning on my truck being a mostly on road vehicle ( ocassionally yanking a tractor out the mud) do you thing radius arm despite being the quickest to bind would be the best for simplicity’s sake? Also a fab shop did one of these trucks with a huge lift on radius arms, I don’t have links to the thread but I have the pics.
 
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Eskimomann209

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Thanks for the insight! Much appreciated. I’m planning on my truck being a mostly on road vehicle ( ocassionally yanking a tractor out the mud) do you thing radius arm despite being the quickest to bind would be the best for simplicity’s sake? Also a fab shop did one of these trucks with a huge lift on radius arms, I don’t have links to the thread but I have the pics.

For simplicity radius is hands down quick and easy.
And most people only run one side with the top arm...
so it would be like a “3” link if you know what I mean.

Two lowers
one upper
And of course the Pan hard
 

Eskimomann209

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Also that’s a good build and for the 4wd frame coilovers work well on the outside of the frame.
for 2wd frames we have the bucket keeping it from being an easy choice.

That’s why I ended up going coils.
 

CarolinaOBS

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Also that’s a good build and for the 4wd frame coilovers work well on the outside of the frame.
for 2wd frames we have the bucket keeping it from being an easy choice.

That’s why I ended up going coils.

Exactly why I'm doing coils as well. How did you clearance the front cross member for the pumpkin? or was the lift tall enough it wasn't an issue?
 

Eskimomann209

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Sorry for the delay
 

dcp1992

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That's what it looks like. And yeah, it's for the steering and track bar. That's the same way Off Road Unlimited tells you to cut in there 2wd SAS kit .

Something along the lines of follow the weld line all the way across the cross member and cut the lower link mounts off.

I just wanted to see it done and know if there seems to be any I'll effects from doing so. But it doesn't seem like it .
 

RDF1

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Ive got a 4 link calculator in excel if anyone wants to play around with it.
 
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