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Old February 28th, 2008, 12:55 PM   #1
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Default Lower Link Materials..

What is your experience, and your preference?

Building rear 4 link, front 3 or 4 link.

Lowers will be in the 36-40" length.

Loaded vehicle weight ~3500 lbs.

I'm thinking standard 2" x 0.250" wall mild steel DOM, at the moment..
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Old February 28th, 2008, 01:31 PM   #2
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That should be sufficient, but if you want stupid strong ... .375" would be where it's at. I've seen it used on a couple different rigs, they're heavy and probably overkill, but you're probably not going to bend 'em.
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Old February 28th, 2008, 01:36 PM   #3
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I had radius arms from 2x4 1/4 wall and not a dent in it with a 4500lb Jeep. Round....? I think I'm going to use 2" 3/16" for my front 3 link. And 3500 is rather light, 1/4 might be overkill...
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Old February 28th, 2008, 01:49 PM   #4
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36" lowers

1 3/4 OD, 3/8 ID DOM

bend a lower first trip to drummond... still running it bent though.
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Old February 28th, 2008, 02:42 PM   #5
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1.75x.25 at a minimum, the problem with 2.0" is it is hard to get fitted with a weld onto most flex joints.

If I were to do it again I would/will use 1.75x.25 or .188 chromoly, or a fabricated arm of varying materials and thicknesses, or last but not least solid 7075 aluminum
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Old February 28th, 2008, 03:10 PM   #6
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Quote:
Originally Posted by 95geo View Post
1.75x.25 at a minimum, the problem with 2.0" is it is hard to get fitted with a weld onto most flex joints.

If I were to do it again I would/will use 1.75x.25 or .188 chromoly, or a fabricated arm of varying materials and thicknesses, or last but not least solid 7075 aluminum
I'll probably run a rubber bushing at the axle end, haven't decided a joint for the uppers yet.

4130 heat treat is pimp, but $$$$$
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Old February 28th, 2008, 03:12 PM   #7
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Originally Posted by silverxj View Post
That should be sufficient, but if you want stupid strong ... .375" would be where it's at. I've seen it used on a couple different rigs, they're heavy and probably overkill, but you're probably not going to bend 'em.
Quote:
Originally Posted by lgottler View Post
I had radius arms from 2x4 1/4 wall and not a dent in it with a 4500lb Jeep. Round....? I think I'm going to use 2" 3/16" for my front 3 link. And 3500 is rather light, 1/4 might be overkill...

This Jeep is being designed with every component looked at with weight in mind.

I've done bending moment analysis on various sizes and materials, mainly looking to see peoples experiences...
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Old February 28th, 2008, 03:13 PM   #8
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Quote:
Originally Posted by Bones View Post
36" lowers

1 3/4 OD, 3/8 ID DOM

bend a lower first trip to drummond... still running it bent though.
Do you mean 1 3/8" ID? (so, that'd be a 3/16" wall)
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Old February 28th, 2008, 04:24 PM   #9
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sorry, I meant 1 3/4 OD, 3/8 wall, 1" ID
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Old February 28th, 2008, 05:07 PM   #10
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Quote:
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This Jeep is being designed with every component looked at with weight in mind.
if weight is a concern then you want a high strength steel or aluminum. if money is also a concern then it's your call on what you can justify spendig the coin on.
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Old February 28th, 2008, 05:19 PM   #11
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Quote:
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sorry, I meant 1 3/4 OD, 3/8 wall, 1" ID
Gotcha.

Hmm:

1.75" x 0.375" wall is 5.513 lbs/linear foot, moment of inertia = 0.411
2.00" x 0.250" wall is 4.677 lbs/linear foot, moment of inertia = 0.537

so 2.00 x 0.250 is stronger and lighter....
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Old February 28th, 2008, 05:27 PM   #12
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I always had the idea that if I were gonna build my own links I would just use 1 1/2 or 1 3/4" solid steel and never worry about bending one no matter what I did.
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Old February 28th, 2008, 05:35 PM   #13
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1.75 solid alluminium 7075
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Old February 28th, 2008, 06:19 PM   #14
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Quote:
Originally Posted by jeepitupyo View Post
I always had the idea that if I were gonna build my own links I would just use 1 1/2 or 1 3/4" solid steel and never worry about bending one no matter what I did.
Solid steel isn't that much different in strength, and much heavier.

2.0 x 0.25 wall is about half the weight and stronger than 1.75" solid stock.


What are you guys paying per foot for the 7075?
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Old February 28th, 2008, 06:30 PM   #15
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Quote:
Originally Posted by jeepitupyo View Post
I always had the idea that if I were gonna build my own links I would just use 1 1/2 or 1 3/4" solid steel and never worry about bending one no matter what I did.
actually solid is weaker than a thick tube.

i rad solid 1.5" steel and bent the hell out of them. I upgraded to 7075 1.75 alluminium. and if they ever do bend. they bend back.
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Old February 28th, 2008, 06:31 PM   #16
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Quote:
Originally Posted by Haggar View Post
Solid steel isn't that much different in strength, and much heavier.

2.0 x 0.25 wall is about half the weight and stronger than 1.75" solid stock.


What are you guys paying per foot for the 7075?
i paid $18 a foot about 6 months ago. but when u factor in you dont need weld inserts its not really that much more than DOM. If you have access to a lathe to drill and tap them.
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Old February 28th, 2008, 06:36 PM   #17
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holy shit $18 a foot, i was bummin about my 1.5 250 wall dom that was $7 a ft. And just for the record i havent bent my lowers in the garage yet
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Old February 28th, 2008, 06:52 PM   #18
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Quote:
Originally Posted by chevotass View Post
i paid $18 a foot about 6 months ago. but when u factor in you dont need weld inserts its not really that much more than DOM. If you have access to a lathe to drill and tap them.
I have a south bend that I can use for drilling/tapping, but can just as easy make steel inserts with it..


I don't plan on running threaded joints at both ends though. So the aluminum wouldn't work with my plan.

Last edited by Haggar; February 28th, 2008 at 07:01 PM.
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Old February 28th, 2008, 08:09 PM   #19
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2.0 will dent easier than 1.75 and when it gets a dent the strength is compromised.

I am 99% sure I'll be using solid 7075 for my next links. 6061 is not good enough either it needs to be 7075.... in case anyone is wondering and trying to get off cheaper

2.0" lowers and 1.75" uppers
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Old February 28th, 2008, 08:36 PM   #20
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Quote:
Originally Posted by Haggar View Post
Gotcha.

Hmm:

1.75" x 0.375" wall is 5.513 lbs/linear foot, moment of inertia = 0.411
2.00" x 0.250" wall is 4.677 lbs/linear foot, moment of inertia = 0.537

so 2.00 x 0.250 is stronger and lighter....
on paper, you are right
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