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Unread 01-26-2010, 12:45 PM   #1
goldswim5
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Lets talk mid-arms

I'm getting ready to 4-link the rear of my jeep, and have decided on mid arms. After a trip to SMORR I decided I'd be getting hung up to much with long arms, and the ride just sucks with short arms. So that leaves mid arms. What is the length range that would generally be considered mid arm? I'm going to be triangulating the uppers, is there any forumula that says what length the upper should be compared to the lower? I'm thinking somewhere around 24-26" lowers.

I've got 6 Johnny Joints, 2 bushings, a truss, and control arm mounts sitting here so once I get this figured out I'll be ready to start.

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Unread 01-26-2010, 01:00 PM   #2
SierraDave
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Tag for more info. I'd really like to do a mid-arm three-link on the front of my Rubi.
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Unread 01-26-2010, 01:32 PM   #3
mudb8
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I've been working on a 26" mid arm kit for a while in my non existant spare time, haven't had time to finish the front track bar problems.....

26" is about what I figure will work the best from stock height to about 5" with 12-14" travel shocks. the unsprung spring length is an issue with lower lift hieghts and long travel that's not matched by using shock relocation, then there's tire/fender clearance issues without highlined fenders...
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Unread 01-26-2010, 01:35 PM   #4
goldswim5
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Quote:
Originally Posted by mudb8 View Post
26" is about what I figure will work the best from stock height to about 5" with 12-14" travel shocks. the unsprung spring length is an issue with lower lift hieghts and long travel that's not matched by using shock relocation, then there's tire/fender clearance issues without highlined fenders...
Mud what would you aim for with the uppers with a 26" lower?
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Unread 01-26-2010, 01:37 PM   #5
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The general rule of thumb for uppers is 70% of lower length. So, around 18.5-19" would likely work well. A link calculator really helps with determining link length and placement.
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Unread 01-26-2010, 01:43 PM   #6
goldswim5
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Quote:
Originally Posted by imped4now View Post
The general rule of thumb for uppers is 70% of lower length. So, around 18.5-19" would likely work well. A link calculator really helps with determining link length and placement.
I believe that is for non-triangulated setups though right? I've been playing with the calculator for about an hour now, but I'm not exactly an expert on what the results mean.
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Unread 01-26-2010, 01:50 PM   #7
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Quote:
Originally Posted by goldswim5 View Post
Mud what would you aim for with the uppers with a 26" lower?
that depends on how "correct" you wanna build the links.

like imped4now said, about 70%.

I'm still working on a tri link that works for me..

set up like RE and some others, they merely act as a radius arm due to the mounting locations.
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I want your factory 07-up take-off/thrown out JK front/rear Lower Control Arms! Bent ones are perfect also as long as the bushings and cold cut rings are in good shape/useable


HighLine Hood Jeepers
TJ Adjustable Track bars
DIY highline fenders.... 34-37's under 0"-2.5" lifts
shock length, bumpstop extension, tire size chart click here
DIY shock shifters, more uptravel/better ride




2011 E-350 4x4 Van conversion

2006 Rubicon Unlimited

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Unread 01-26-2010, 01:50 PM   #8
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From what I've seen, it all depends on link placement. For example, most guys I've seen with Poly Perf's 4 link setup have longer uppers than lowers by a couple inches and it works great. I've not built a link suspension setup on my own so I'm still not fully familiar with the optimum placement/length numbers and how they effect squat, roll steer, etc. I fully intend to over-research the topic when the time comes so that I understand everything to a T.
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Unread 01-26-2010, 02:34 PM   #9
goldswim5
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This is what I'm looking to do. This is ATXZJ's old rig, 26" lowers and 32" uppers. I think that's what I'm going to go with if I can get it to work in the calculator.

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Unread 01-26-2010, 02:51 PM   #10
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Yep, and I believe that's the Poly kit. Those are definitely the (beautiful) Poly frame mounts.
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Unread 01-26-2010, 02:53 PM   #11
goldswim5
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You would think so, he did a great job, but it's actually custom. You can see his build here:

Made some progress on the MidArm Project *PICS* - Page 2 - JeepsUnlimited.com Forums
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Unread 01-26-2010, 03:00 PM   #12
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Why yes it is. I knew he did good work, but man.....
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Unread 01-26-2010, 03:05 PM   #13
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It does look good and I'm wanting to go down the same road...the real question is why did he get rid of those to build a long arm set up?
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Unread 01-26-2010, 03:09 PM   #14
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Probably like any of us--why get rid of short arms that work well? He probably just wanted to build something else for the hell of it. And he may have been thinking: "My jeep works better now with longer arms than it did with short arms. I wonder if the trend will continue with even longer arms....."

But I don't know, hopefully he contributes.
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Unread 01-26-2010, 03:49 PM   #15
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No, that's not it I've read some of his comments and it was more along the line of "don't waste your time with mid-arms just to have to do it again." But, yes, hopefully he'll chime in and we can get his opinions.

Ultimately it's all about what set up you're going for and what you're going to do with it - but it's nice to talk with someone that has done it already.
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