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Short Arm vs. Long Arm?


 
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DelmarvaXJ
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Joined: 28 May 2007
Location: Naptown Maryland

PostPosted: Fri Jun 01, 2007 5:40 am    Post subject: Short Arm vs. Long Arm? Reply with quote

What are the differences and advantages of running a long arms vs. the standard short arms? I'm not quite understanding the advantages of the long arm kit? From reading the NAXJ website, they say that the long arms are the only way to go... They say that the ride is softer, and more responsive, and rock climbing is made easier with the long arms, but I want to know why?
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Orangeamc13
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Joined: 20 Feb 2006
Location: East Springfield, Massachusetts - U.S.A.

PostPosted: Fri Jun 01, 2007 7:45 am    Post subject: Reply with quote

Basically long arms are the best way to keep the suspension geometry where it needs to be. The higher the Jeep is lifted, the sharper the angle gets on the stock or short arms. The long arms solve this problem. If you got the cash get the long arms, if not get some adjustable short arms, or control arm drop brackets.
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5.9 andy
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Joined: 15 Feb 2007

PostPosted: Fri Jun 01, 2007 11:24 am    Post subject: Reply with quote

stay away from drop brackets, i have heard that they are VERY prone to being smashed on rocks.

long arms basicly give you more flex and let u do FATTY lift kits.
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Code3TJ
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PostPosted: Fri Jun 01, 2007 11:34 am    Post subject: Reply with quote

As orange said, it's all about geometry. Imagine a right triangle made up of the spring, frame and control arm. As the spring gets taller, the angle for the control arm to still connect to the frame and axle grows. As the angle gets steeper, it moves the axle further back, effectively shortening your wheelbase. So when you hit a bump, instead of the stock angle which causes the front control arm to move up and back, the control arm has to move forward and up which causes a harsher ride. A long(er) control arm gets the angle back closer to stock (i.e. parallel to the frame) which returns the wheelbase closer to stock and improves the ride and handling.
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DelmarvaXJ
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Joined: 28 May 2007
Location: Naptown Maryland

PostPosted: Fri Jun 01, 2007 12:46 pm    Post subject: Reply with quote

Code3TJ wrote:
As orange said, it's all about geometry. Imagine a right triangle made up of the spring, frame and control arm. As the spring gets taller, the angle for the control arm to still connect to the frame and axle grows. As the angle gets steeper, it moves the axle further back, effectively shortening your wheelbase. So when you hit a bump, instead of the stock angle which causes the front control arm to move up and back, the control arm has to move forward and up which causes a harsher ride. A long(er) control arm gets the angle back closer to stock (i.e. parallel to the frame) which returns the wheelbase closer to stock and improves the ride and handling.


Nice explaination, thanks Very Happy I'm looking into either the RE 5.5" LA kit or Rusty's 6.5" LA kit, there's not much of price difference. All I want is to fit 33x12.5" wheel/tire combo which keeping it streetable, and can handle sand dunes.
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berk9
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Joined: 16 Apr 2007
Location: Waynesboro VA

PostPosted: Sun Jun 03, 2007 11:36 am    Post subject: Reply with quote

i have the drop brackets on my xj with 6 inch lift and yes they do hit rocks a lot. all the drop brackets do is correct the angle of the short arms but if you think about it the drop brackets are going to be the exact same height off the ground as the long arms unless you get high clearance arms which tend to be weaker then norm long arms. you gain and lose things from both drop brackets and long arms. my biggest problem with my drop brackets have been strength related because they arent braced. i also score over a 1000 on an rti so like i said you gain and lose
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front 9" arb chromos 4.56s warn hubs; rear 8.8 detroit and 4.56s; rustys crap long arms crossmember and coils; RE leafs; rusty boomerang and 2' block; oh and trimming gotta love that sawzall
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DelmarvaXJ
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Joined: 28 May 2007
Location: Naptown Maryland

PostPosted: Mon Jun 04, 2007 6:47 am    Post subject: Reply with quote

berk9 wrote:
i have the drop brackets on my xj with 6 inch lift and yes they do hit rocks a lot. all the drop brackets do is correct the angle of the short arms but if you think about it the drop brackets are going to be the exact same height off the ground as the long arms unless you get high clearance arms which tend to be weaker then norm long arms. you gain and lose things from both drop brackets and long arms. my biggest problem with my drop brackets have been strength related because they arent braced. i also score over a 1000 on an rti so like i said you gain and lose


This might be a stupid question, but since I'm relatively new to offroading, what exaclty is a drop bracket? Is it the same as the pitman arm or the mounting point of the front control arms? Again baer with me i'm a newbie... Very Happy
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Orangeamc13
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Joined: 20 Feb 2006
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PostPosted: Mon Jun 04, 2007 7:49 am    Post subject: Reply with quote

It is the rear frame mounting point on the control arms. Like Berk said it allows you to run short arms and still have the correct geometry.

Control Arm Angles

Bracket on a TJ

Here's a write up on an XJ with photos

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DelmarvaXJ
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Joined: 28 May 2007
Location: Naptown Maryland

PostPosted: Mon Jun 04, 2007 2:51 pm    Post subject: Reply with quote

Orangeamc13 wrote:
It is the rear frame mounting point on the control arms. Like Berk said it allows you to run short arms and still have the correct geometry.

Control Arm Angles

Bracket on a TJ

Here's a write up on an XJ with photos


Thanks for the explaination, any pics of the drop bracket installed on an XJ? Also why does the RE website list the drop bracket, and how much does it run?
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Orangeamc13
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Joined: 20 Feb 2006
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PostPosted: Mon Jun 04, 2007 3:13 pm    Post subject: Reply with quote

Orangeamc13 wrote:
Here's a write up on an XJ with photos

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DelmarvaXJ
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Joined: 28 May 2007
Location: Naptown Maryland

PostPosted: Mon Jun 04, 2007 3:31 pm    Post subject: Reply with quote

Cool I noticed that the RE 5.5" short arm kit does come with the drop brackets. But good to know that they are use full and I can buy the seperately if I decide to go with a different company.
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1fox2go
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Joined: 01 Dec 2004
Location: Fishersville, Virginia

PostPosted: Tue Jun 05, 2007 6:14 pm    Post subject: Reply with quote

RE drop brackets with braces run about 325 or so on ebay

heres a couple pics

Berks


And another friend, Lil Hoss

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DelmarvaXJ
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Joined: 28 May 2007
Location: Naptown Maryland

PostPosted: Wed Jun 06, 2007 5:55 pm    Post subject: Reply with quote

1fox2go wrote:
RE drop brackets with braces run about 325 or so on ebay

heres a couple pics

Berks


What's the lift and tire combo on the red xj? thanks
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berk9
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Joined: 16 Apr 2007
Location: Waynesboro VA

PostPosted: Wed Jun 06, 2007 7:16 pm    Post subject: Reply with quote

look at my signature to see my set up. lots of trimming + more since that pic
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front 9" arb chromos 4.56s warn hubs; rear 8.8 detroit and 4.56s; rustys crap long arms crossmember and coils; RE leafs; rusty boomerang and 2' block; oh and trimming gotta love that sawzall
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1fox2go
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Joined: 01 Dec 2004
Location: Fishersville, Virginia

PostPosted: Wed Jun 06, 2007 8:15 pm    Post subject: Reply with quote

Heres a short arm kit, flexed


and sittin level


i wish i had drop brackets, It would help my flex
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96 Cherokee 7.5 inch TnT long arm Locked F/R, D44 rear, 4.56s, 35x12.50 Muds/36x12.50 TSLs
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