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Old 11-21-2012, 09:32 PM   #1
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Adjustable control arms

I just recently got back into the jeep scene. After I put my 4in short on RG ORV lift on it, I noticed that it only came with lower control arms like most lifts. As I've been looking around I keep seeing adjustable control arm this and that. I know that when you lift a jeep usually anything over 2in you start to get drivetrain vibrations. I guess my question is what do you gain with adjustable arms? And do you really only need upper or lower?

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Old 11-21-2012, 09:52 PM   #2
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You gain the ability to set your pinion angle to eliminate driveline vibrations, which minimized driveline ware. Rear lowers and uppers with a SYE and a CV driveshaft will get rid of vibrations, and allow you to gain more clearance by taking out a TC drop (if you had one) or even doing a tummy tuck down the road if you desire.

Lowers are essential for setting pinion angles however having both can help a lot. Just uppers pretty much gets you nowhere though.

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Old 11-21-2012, 09:58 PM   #3
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Originally Posted by kbarber View Post
You gain the ability to set your pinion angle to eliminate driveline vibrations, which minimized driveline ware. Rear lowers and uppers with a SYE and a CV driveshaft will get rid of vibrations, and allow you to gain more clearance by taking out a TC drop (if you had one) or even doing a tummy tuck down the road if you desire.

Lowers are essential for setting pinion angles however having both can help a lot. Just uppers pretty much gets you nowhere though.
Ahh ok so its mainly the lowers that end up doing all the work in the end? And is it necessary to have SYE and driveshaft or just and extended driveshaft do the same thing? I haven't really ran into any vibrations yet and I don't have SYE or longer driveshaft
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Old 11-22-2012, 03:20 AM   #4
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Originally Posted by kbarber View Post
You gain the ability to set your pinion angle to eliminate driveline vibrations, which minimized driveline ware. Rear lowers and uppers with a SYE and a CV driveshaft will get rid of vibrations, and allow you to gain more clearance by taking out a TC drop (if you had one) or even doing a tummy tuck down the road if you desire.

Lowers are essential for setting pinion angles however having both can help a lot. Just uppers pretty much gets you nowhere though.
I'd have to disagree. If you can only buy one set and want to adjust pinion angle youd be best off buying rear uppers.
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Old 11-22-2012, 07:27 AM   #5
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Yup. I ran adjustable uppers with the stock lowers for a while after my SYE install. That way I was able to set the pinion angle, remove the tc drop the PO installed and cure the major vibration that I had.
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Old 11-22-2012, 07:52 AM   #6
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The majority get uppers for adjusting pinion angle when the SYE is installed. This is the majority.

Think about the potential problem when using just adjustable uppers..... of 'rolling' your axle backwards, using the lower axle control arm bushing as a pivot point, to point your pinion up to correct orientation. It doesn't seem like much, but you have now, in essence, pushed your axle back toward your tank. This may cause interference with the rear track bar and tank.

I have both upper an lower adjustable control arms which I use to keep my wheelbase in factory location. As I lengthen the uppers, I shorten the lowers to raise the pinion, and shorten the uppers and lengthen the lowers to lower my pinion. This ensures my axle maintains the factory wheelbase spec and less likely to have any interference issues.

I know we are talking about the rear, but the front is just as important. Having the ability to adjust the uppers and lowers will allow you to set your caster to your lift properly AND keep the axle in the location it is meant to be in. This again will keep your axle in the best possible position under your rig to have the optimum clearance from other components while the suspension cycles.

Can you get away with just uppers.... majority says yes. Does it benefit to have full adjust-ability on all uppers and lowers.. ABSOLUTELY.

The choice is yours......
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Old 11-22-2012, 09:06 AM   #7
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Originally Posted by TnDz TJ View Post
The majority get uppers for adjusting pinion angle when the SYE is installed. This is the majority.

Think about the potential problem when using just adjustable uppers..... of 'rolling' your axle backwards, using the lower axle control arm bushing as a pivot point, to point your pinion up to correct orientation. It doesn't seem like much, but you have now, in essence, pushed your axle back toward your tank. This may cause interference with the rear track bar and tank.

I have both upper an lower adjustable control arms which I use to keep my wheelbase in factory location. As I lengthen the uppers, I shorten the lowers to raise the pinion, and shorten the uppers and lengthen the lowers to lower my pinion. This ensures my axle maintains the factory wheelbase spec and less likely to have any interference issues.

I know we are talking about the rear, but the front is just as important. Having the ability to adjust the uppers and lowers will allow you to set your caster to your lift properly AND keep the axle in the location it is meant to be in. This again will keep your axle in the best possible position under your rig to have the optimum clearance from other components while the suspension cycles.

Can you get away with just uppers.... majority says yes. Does it benefit to have full adjust-ability on all uppers and lowers.. ABSOLUTELY.

The choice is yours......
I agree 100% with you. What I meant was if you absolutely can only afford one set to begin with than the uppers will be of more use to adjust the pinion angle. Especiialy with a 4" lift like the OP adjustable uppers an lowers is definately the correct and best way.

I am about to order a set of Currie adjustable rears for my TJ. Things are just too damn expensive over here and I am ordering SYE, CV driveshaft and UCA in one go.
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Old 11-22-2012, 09:10 AM   #8
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Originally Posted by Rolf View Post
I agree 100% with you. What I meant was if you absolutely can only afford one set to begin with than the uppers will be of more use to adjust the pinion angle. Especiialy with a 4" lift like the OP adjustable uppers an lowers is definately the correct and best way.

I am about to order a set of Currie adjustable rears for my TJ. Things are just too damn expensive over here and I am ordering SYE, CV driveshaft and UCA in one go.
I'm on board with what you meant.... and completely understand the financial aspect of it. I wanted to give a little insight as to the benefits of both.
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Old 11-22-2012, 09:11 AM   #9
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That was pretty much what I meant too.
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Old 11-22-2012, 11:46 AM   #10
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Quote:
Originally Posted by Rolf

I agree 100% with you. What I meant was if you absolutely can only afford one set to begin with than the uppers will be of more use to adjust the pinion angle. Especiialy with a 4" lift like the OP adjustable uppers an lowers is definately the correct and best way.

I am about to order a set of Currie adjustable rears for my TJ. Things are just too damn expensive over here and I am ordering SYE, CV driveshaft and UCA in one go.
Thanks for the info bud I know its important to have a full front and rear adjustable arms. This is my project jeep that I've only had a few months now. I'm just trying to figure out where I should start now my lift is on. Do I need to start with sye and drive shaft, or control arms first? And I've read about people putting sye on their rig what exactly dose that do if you put a sye on? When I was younger I only went down on cars never up so I'm new to all the suspension and accessories for a lifted vehicle
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Old 11-22-2012, 06:42 PM   #11
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Yea definitely meant uppers not lowers, I was posting under the influence of pain killers because I got my wisdom teeth removed. So I was a bit loopy
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Old 11-22-2012, 06:45 PM   #12
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Basically, at a minimum, if you do the SYE, you'll need UCAs. Control arms with Curry Johnny Joints are the preferred arms to use.

The SYE (Slip-Yoke Eliminator) will allow you to use a longer drive shaft, with better drive line angles. To fully utilize it though, you'll need a CV type read shaft, and adjustable rear control arms at a very minimum.
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Old 11-22-2012, 09:07 PM   #13
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Originally Posted by lindel
Basically, at a minimum, if you do the SYE, you'll need UCAs. Control arms with Curry Johnny Joints are the preferred arms to use.

The SYE (Slip-Yoke Eliminator) will allow you to use a longer drive shaft, with better drive line angles. To fully utilize it though, you'll need a CV type read shaft, and adjustable rear control arms at a very minimum.
Ok I've been looking online at cv drive shafts and what not. Now I'm seeing sye and short/super short sye. I'm seeing kits by full traction and teraflex is their a difference bet the types of sye and brand names? And all this talk about the rear what about front drive line?
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Old 11-22-2012, 09:25 PM   #14
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Super or Mega short is just that, extremely short. Google images of SYE and super or mega short SYE and you'll see the differences.

The brands usually indicate quality, JB Conversions, and Advance Adapters are generally considered quality kits. Rugged Ridge is lesser quality

The shorter the SYE kit, the better the angles will be, or more shallow. Shallower angles are easier to correct for, or don't need as much correction.

The drive lines in TJs are important because of the very short wheel base. Short wheel base, high lifts are a good recipe for vibrations.
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Old 11-22-2012, 09:46 PM   #15
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Originally Posted by lindel
Super or Mega short is just that, extremely short. Google images of SYE and super or mega short SYE and you'll see the differences.

The brands usually indicate quality, JB Conversions, and Advance Adapters are generally considered quality kits. Rugged Ridge is lesser quality

The shorter the SYE kit, the better the angles will be, or more shallow. Shallower angles are easier to correct for, or don't need as much correction.

The drive lines in TJs are important because of the very short wheel base. Short wheel base, high lifts are a good recipe for vibrations.
Thanks bud simple easy to understand and makes obvious sense now that I think about it. I know tom woods is good but what about Tera flex shafts and sye?
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Old 11-22-2012, 09:49 PM   #16
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I don't know anything about them, so I can't help there.

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