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Old 06-17-2003, 07:20 PM   #1 (permalink)
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building 4-link suspension

How do you find the lengths of you control arms when building a 4 link? I have a 94inch wheel base with 35inch tires.
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Old 06-17-2003, 07:58 PM   #2 (permalink)
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First you should know I have never built one. However if you are just thowing on a 4 link without worrying about equations and geometry I have seen/heard of it done this way: decide where the control arms will mount on the frame and the axle. Then line your axle up underneath the Jeep so thats its where you want it being sure its centered etc and the Jeep is at the height you want it end up at. Then measure and build. A little simplistic and basic.
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Old 06-17-2003, 08:04 PM   #3 (permalink)
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Quote:
Originally posted by BMcKinley
First you should know I have never built one. However if you are just thowing on a 4 link without worrying about equations and geometry I have seen/heard of it done this way: decide where the control arms will mount on the frame and the axle. Then line your axle up underneath the Jeep so thats its where you want it being sure its centered etc and the Jeep is at the height you want it end up at. Then measure and build. A little simplistic and basic.
you forgot one thing...http://www.pirate4x4.com/forum/search.php
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Old 06-17-2003, 08:05 PM   #4 (permalink)
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sorry but FAWKIN' SEARCH!!!!!

come-on....
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Old 06-17-2003, 08:16 PM   #5 (permalink)
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one of this months 4x4 magizanes has a great artical in it on 4 link
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Old 06-17-2003, 08:18 PM   #6 (permalink)
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one of this months 4x4 magizanes has a great artical in it on 4 link

Excellent news, Newbie! How does it compare to some of the dribble I've seen on the internet?

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Old 06-17-2003, 08:28 PM   #7 (permalink)
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It is just your basics but it is somewhere to start
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Old 06-17-2003, 10:21 PM   #8 (permalink)
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Originally posted by dlc
one of this months 4x4 magizanes has a great artical in it on 4 link
Actually how to determine length of control arms is one of the things I think is worst in that article (not that it was a bad article) They say that the upper link should be 70% the length of the lower, no explanation why just thats the way it is. Not only do they fail to mention why to do this but also the effect this would have on pinion angle as the suspension cycles, basicly with shorter upper as the axle droop the pinion will point further and further down. Can you say blown D-shaft or snapped pinion? Hmm that sounds like a well thought out and well designed setup to me.......

Ok back on topic, when building a 4 link you got alot more to worry about then just length.
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Old 06-18-2003, 02:45 AM   #9 (permalink)
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greater length overall is positive but dont get get carried away. The length of the links are not the thing in your design that will require the most brains.
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Old 06-18-2003, 05:20 AM   #10 (permalink)
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Originally posted by NE-RokToy


Actually how to determine length of control arms is one of the things I think is worst in that article (not that it was a bad article) They say that the upper link should be 70% the length of the lower, no explanation why just thats the way it is.
The length is not overall, just on the horizontal plane. But I agree with you about that being the wrong way to do it...
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