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Unread 10-16-2004, 04:10 PM   #1
BigTimber
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Is mine a long arm or not?

I bought a '01 TJ with a 4.5 Rubicon Express lift. I am always asked if it is a "Long Arm" lift. How can I tell?

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Unread 10-16-2004, 04:15 PM   #2
red99tj
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Quote:
Originally Posted by BigTimber
I bought a '01 TJ with a 4.5 Rubicon Express lift. I am always asked if it is a "Long Arm" lift. How can I tell?

youll have real long control arms, hence the name long arm
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Unread 10-16-2004, 04:40 PM   #3
BigTimber
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Do long arms use the stock mounts or different frame mounts? Mine use the stock mounts.
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Unread 10-16-2004, 04:41 PM   #4
RockRunner85
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Basically if the control arms are short, around 16" or so, and attach to the frame with factory looking mounts its the short arm lift. If they are long and go to a new t-case skid with a crap load of bolts its the long arm kit.
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Unread 10-16-2004, 04:41 PM   #5
BigWaylon
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Quote:
Originally Posted by BigTimber
Mine use the stock mounts.
then yours is the normal short arm kit...the long arms will bolt to an aftermarket skid plate...

Greg
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Unread 10-16-2004, 04:43 PM   #6
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here's a long arm kit on an Unlimited:



Greg
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Unread 10-16-2004, 05:17 PM   #7
BigTimber
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Thank You all for the Info. on this. Is there a kit to convert my RE lift to a "Long Arm"?
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Unread 10-16-2004, 05:40 PM   #8
ONE JEEPBRO
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Quote:
Originally Posted by BigTimber
Thank You all for the Info. on this. Is there a kit to convert my RE lift to a "Long Arm"?
yes, go to www.rubiconexpress.com and they have upgrade kits for the long arm system. NOT cheap though, runs around 1,000+ buckaroo's.
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Unread 10-16-2004, 07:42 PM   #9
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Quote:
Originally Posted by RockRunner85
Basically if the control arms are short, around 16" or so, and attach to the frame with factory looking mounts its the short arm lift. If they are long and go to a new t-case skid with a crap load of bolts its the long arm kit.

Mmmmm, what's this then ??








Fred
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Unread 10-16-2004, 07:55 PM   #10
RockRunner85
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Quote:
Originally Posted by StealthTJ
Mmmmm, what's this then ??








Fred
You got me there. Is that a custom front axle with custom short arms?? Looks like it'd give you a better ride. Want to fill me in?
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Unread 10-16-2004, 08:09 PM   #11
FlexyTJ
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Its a medium length J-arm. Not a true LA though.
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Unread 10-16-2004, 09:20 PM   #12
StealthTJ
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Quote:
Originally Posted by RockRunner85
You got me there. Is that a custom front axle with custom short arms?? Looks like it'd give you a better ride. Want to fill me in?

Those are the Currie J-Arms, installed on a HP D30 axle. I also have the J-Arms installed on the rear axle.
All the advantages of a "long arm" kit, and none of the disadvantages.
This is considered a "medium arm"....

A *big* problem with the typical LA kit, if you play (wheel) in the big rocks, where clearance is a premimum, is the lose of clearance from those 'ole long arms hanging way down there.
They get hung up all the time, and have been bent on a somewhat regular basis.

What needs to be done, with the control arms, when you lift a Jeep, is to try and get the angle back, as close as possible, to parallel to the ground, when the Jeep is sitting level.
If you go look at a lifted Jeep with stock length arms, you'll see that the logically way to do this would be to raise the end of the arm that's been moved downward. Right ? That would be the axle end. When you lift a Jeep you move the frame up higher from the axle, thus "lowering" the axle end of the control arm, or, looking at it the other way, raising the frame end of the arm.
The logical thing to do is to bring the axle end of the arm back up, towards the frame end.
The LA kits don't do that, as it involves welding and some moderate fabrication ability. So, what they do is raise the frame end of the arm (which is already above the axle end) higher, and then, to try and moderate the angle, they make the control arm long, moving it back to the edge of the xfer case.
Look at the photo (above) of the LA kit that Bigwalon posted, and it'll become obvious what I'm talking about.

Another goal, is to try and have the axle, when it articulates, move more straight up and done, instead of in an arc.
Again, the LA kits do that by lengthing the arms.
The J-Arms do it by the way that they wrap under the axle, mounting on the other end.
Regarding the effective angle of the arm, it doesn't matter how the arm bends nor how deep the bend is. The effective angle is a straigth line drawn between the center of the two mounting points.
Put a straight edge (edge of a piece of paper or something), up to the screen, in the photo that I posted above, and set it such that the straight edge goes from the center of the mounting bolt on the axle, to the center of the mounting bolt on the frame. Notice how little angle is in the arm now.




Fred
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[b]Base[/b] - '98 Sahara, 4.0L 6 cyl, Auto (swap from 5 sp)
[b]Suspension[/b]- 4.0" Procomp Springs + 1 1/4" bl. Rear tri-link. Currie J arms, F&R. Warn hubs with WJ knuckles, custom cross over/hi-steering setup, Currie A/R Sway Bar.
HPD30/D44 (rear disk conversion, WJ dual piston caliber conversion in the front); Detroits; 4.56
[b]Misc[/b] - Tera 2wd lo.
[b]Tires[/b] - 35x12.50 MT/R's siped on 15x7 Champion Beadlocks.
[b]Recovery[/b] - Warn XD9000i
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Unread 10-16-2004, 10:19 PM   #13
Stormtrooper
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Hey, whats the deal with the weld down the length of the axle tube? Looks like it was made from scratch.

From the looks of it, the J-arm only gives about 5-6" of extra length. Compare this to almost 20" of extra with the long arm. The long arm swings on a 38" or so radius which makes the axle movement more "up and down". Less so with a shorter arm and the same lift.

I've never heard of anyone bending a long arm, but i have beat the crud out of wimpy stamped (stock) control arms. I'm gonig to go out on a limb here and say that the long arms are WAY superior to the J-arm or for that matter any short arm lift. My 2 centz.
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Unread 10-16-2004, 10:28 PM   #14
camoTJ
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I have seen mulitple long arms bend, so you just have to sleeve then again haha. the thing that looks like it sucks about the currie arms is they, cut down your ground clearance a bunch, I would rather slide on my long arms then get hung up on the front of that j-arm
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Unread 10-16-2004, 10:30 PM   #15
Broadway
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The only complaint I hear about J-arms is the loss of clearance due to the fact that extend about 2-1/2 to anout 4 1/2" below the axle and are always banging and hanging up on rocks and what not, how ever, because the rocks hit the J-arm at the curve there is hardly any damage to the J-arm There are advantages and disadvantages to both. I would personally opt to make stronger Longarms.
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