Arms ARMS A R M S!!!! - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 9 Old 10-25-2011, 07:34 PM Thread Starter
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Arms ARMS A R M S!!!!

Stock arms, short arms, long arms.

I never ever thought about arms before. What's the benefit? Drawbacks? Do you really need to change the arms?

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post #2 of 9 Old 10-25-2011, 07:59 PM
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Depends on what you want your end result to be. How will you be using or wheeling? Adjustable arms help to re adjust axle orientation after lifting and can help with flexibility. Long arms again, longer radius to swing, better / easier flex.


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post #3 of 9 Old 10-25-2011, 08:05 PM
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JKs are unlike a lot of past jeeps where you needed to long arm them to get a lot of flex. I have the full set of teraflex adjustable control arms and although i wont be setting an RTI record, it flexes great for my uses.

Control arms are an expensive upgrade and I would say you are generally ok to run any lift up to 2.5, maybe 3 inches without having to upgrade the arms. The main issue when you lift the jeep and keep the stock arms is that it may feel a bit flighty. Adjustable short arms help to solve the issue as well as get your pinion angle correct to alleviate driveline vibrations or other related issues. Long arms on the JK will provide a bit more flex and will certainly make the ride more stable as well. Some of the newer kits for the JK have long arms tied in from new cross members which also help to strengthen some of the notoriously weak spots underneath.

There's a lot out there about control arms, but I hope this puts it into real-world terms for you...

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post #4 of 9 Old 10-25-2011, 11:32 PM
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To add to what's been said, axles like to move in a perfectly vertical motion. Stock height lets that come close to happening. Lifts without arms take away from that and decrease ride quality. Long arms bring the near perfect vertical motion back.

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post #5 of 9 Old 10-25-2011, 11:45 PM
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Yep, the taller you go on stock arms, the less comfort you have in your ride quality because the arm stops pivoting over changes in terrain and instead try to jam into the arm bracket. Long arm changes the pivot point to restore that quality.

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post #6 of 9 Old 10-25-2011, 11:53 PM
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Stock arms = weak, non adjustable
Short Arms = stronger, adjustable
Long Arms = stronger, adjustable, change of suspension geometry
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post #7 of 9 Old 10-26-2011, 04:34 AM Thread Starter
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now go into cost and modification needed. long arms neem new mounts welded on and the stock ones cut off right?

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post #8 of 9 Old 10-26-2011, 07:32 AM
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now go into cost and modification needed. long arms neem new mounts welded on and the stock ones cut off right?

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You have the general idea.


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post #9 of 9 Old 10-26-2011, 08:53 AM
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Originally Posted by mgoony View Post
Stock arms, short arms, long arms.

I never ever thought about arms before. What's the benefit? Drawbacks? Do you really need to change the arms?
if you need to adjust your castor or your wheelbase then yes.

long arms ride better but sacrifice ground clearance (although with some of the kits not by much).

Short arms are stronger (assuming they're aftermarket) but most give you a flex joint in one end and adjustability for setting castor.

the stock arms are fine for mild wheeling as long as your castor isn't too far off.

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