Are all Rock Krawler mid arms the same? - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 14 Old 01-27-2012, 03:11 AM Thread Starter
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Are all Rock Krawler mid arms the same?

I have been looking for front lower arms to complement my stock mod, I found someone that is selling a set but he states that it is from a 3.5 inch lift and it wont work with my 2.5 incher. I contacted RK to confirm if this was the case because I was under the impression that they were all the same and told me there is a part number on the arm that should have correlated with the number he gave me, only the seller cannot find any part number. Does anyone know for sure if all RK mid arms are the same for the varying lift heights?

Thanks...

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RK 2.5 X-Factor | Synergy tie rod | 35x12.5 MTRK's | BFH front | Genright rear | Yukon 5.13's | ARB front locker | Warn M8000 w/MasterPull synthetic | Rigid 10'' E-series
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post #2 of 14 Old 01-27-2012, 03:24 AM
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Quote:
Originally Posted by rdlynch2 View Post
I have been looking for front lower arms to complement my stock mod, I found someone that is selling a set but he states that it is from a 3.5 inch lift and it wont work with my 2.5 incher. I contacted RK to confirm if this was the case because I was under the impression that they were all the same and told me there is a part number on the arm that should have correlated with the number he gave me, only the seller cannot find any part number. Does anyone know for sure if all RK mid arms are the same for the varying lift heights?

Thanks...
There is a difference in the rear arms. When you purchase an x factor lift the rear lower arms are 1" longer. If you check out River City or Just Jeep Gear they give you the option on the 2 arms.

In order to run the longer rear lower arms you will need to purchase the upper arms also.

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post #3 of 14 Old 01-27-2012, 03:39 AM
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Jerseyjeep is right on. Have the seller measure the rear arms from eye to eye that will let you know for sure. The length you want for the rear lowers are 20"s on a 4door and 19.5"s for the 2 door. The front lower midarms are all the same.
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post #4 of 14 Old 01-27-2012, 04:05 AM Thread Starter
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I just plan on doing the front lowers for now.

2008 Black 2Dr 6spd D30/44
RK 2.5 X-Factor | Synergy tie rod | 35x12.5 MTRK's | BFH front | Genright rear | Yukon 5.13's | ARB front locker | Warn M8000 w/MasterPull synthetic | Rigid 10'' E-series
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post #5 of 14 Old 01-27-2012, 04:40 AM
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Originally Posted by rdlynch2 View Post
I just plan on doing the front lowers for now.
Yeah but you should be thinking ahead... where do you want your rig to end up?
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post #6 of 14 Old 01-27-2012, 05:27 AM Thread Starter
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Originally Posted by DaK View Post
Yeah but you should be thinking ahead... where do you want your rig to end up?
I am happy with my suspension set up how it is, but would like to make some additions an bd able to add the proper amount of caster which currenty is only at 1.6 degrees. Like I said I have the stock mod and would eventually like to turn it into the max travel. But I am going to do it piecemeal. After the front lowers all Ill need are the rear lowers and rear sway bar end links. No need for upper adjustables at only 2.5 inches of lift from what I understand

I should have posted in the thread title are all RK lower mid arms the same vs mid arms in general

2008 Black 2Dr 6spd D30/44
RK 2.5 X-Factor | Synergy tie rod | 35x12.5 MTRK's | BFH front | Genright rear | Yukon 5.13's | ARB front locker | Warn M8000 w/MasterPull synthetic | Rigid 10'' E-series

Last edited by rdlynch2; 01-27-2012 at 05:32 AM.
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post #7 of 14 Old 01-27-2012, 05:58 AM
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I've been wondering about this as well. On most vendor sites, there is only one option for Front Lower arms, making me think that they're all the same, no matter which lift.

But that's just my guess. Hopefully one of the vendors or RK will chime in with a better answer.
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post #8 of 14 Old 01-27-2012, 07:31 AM
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JerseyJeep nailed it. X-Factor arms are longer.

2 Door - If you are piecing it together I recommend front lowers first and then upgrade to the rear uppers and lowers with a rear track bar.

4 Door - Just go with the Max Travel rear lowers.

The 2.5 gives you more lift on a two door vs a four door and the added adjustability is nice to have.

Marcus


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post #9 of 14 Old 01-27-2012, 10:06 AM Thread Starter
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Originally Posted by RiverCityOffroad View Post
JerseyJeep nailed it. X-Factor arms are longer.

2 Door - If you are piecing it together I recommend front lowers first and then upgrade to the rear uppers and lowers with a rear track bar.

4 Door - Just go with the Max Travel rear lowers.

The 2.5 gives you more lift on a two door vs a four door and the added adjustability is nice to have.

Marcus
So the front lower control arms are all the same correct? No matter what size lift it was sold for?

2008 Black 2Dr 6spd D30/44
RK 2.5 X-Factor | Synergy tie rod | 35x12.5 MTRK's | BFH front | Genright rear | Yukon 5.13's | ARB front locker | Warn M8000 w/MasterPull synthetic | Rigid 10'' E-series
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post #10 of 14 Old 01-27-2012, 10:49 AM
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Originally Posted by rdlynch2 View Post
So the front lower control arms are all the same correct? No matter what size lift it was sold for?
Yes sir.


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post #11 of 14 Old 01-27-2012, 02:00 PM
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So can you use the X-factor arms on a 2.5 max travel to move the rear axle back an inch?

Last edited by ecb12; 01-27-2012 at 02:11 PM.
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post #12 of 14 Old 01-27-2012, 02:09 PM Thread Starter
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Originally Posted by RiverCityOffroad View Post
Yes sir.
Just curious, why would replacing the rear track bar w adouble adjustable like the front be beneficial? I always thought that it was only needed for the front at 2-3 inches of lift

2008 Black 2Dr 6spd D30/44
RK 2.5 X-Factor | Synergy tie rod | 35x12.5 MTRK's | BFH front | Genright rear | Yukon 5.13's | ARB front locker | Warn M8000 w/MasterPull synthetic | Rigid 10'' E-series
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post #13 of 14 Old 01-27-2012, 02:13 PM Thread Starter
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Oh, and have you ever heard of people upgrading to long arm/ind 3 or 4 link suspension systems w only 2.5 inches of lift? Would you gain significant ride quality/off road flex? Or at that height would the benefits not be apparent?

2008 Black 2Dr 6spd D30/44
RK 2.5 X-Factor | Synergy tie rod | 35x12.5 MTRK's | BFH front | Genright rear | Yukon 5.13's | ARB front locker | Warn M8000 w/MasterPull synthetic | Rigid 10'' E-series
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post #14 of 14 Old 01-27-2012, 02:23 PM
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Originally Posted by ecb12 View Post
So can you use the X-factor arms on a 2.5 max travel to move the rear axle back an inch?
That's what this is:



(I owe you a PM)

Quote:
Originally Posted by rdlynch2 View Post
Just curious, why would replacing the rear track bar w adouble adjustable like the front be beneficial? I always thought that it was only needed for the front at 2-3 inches of lift
When you move the axle back with these arms you need the adjustable track bar to move it around the coils. with the 2.5" RK coils on the two door your axle isn't centered with just the bracket. It's close...but not perfect like you can get it with the adjustable TB.

Besides that, every Jeep is different. There is no chart of absolutes with these things.

Quote:
Originally Posted by rdlynch2 View Post
Oh, and have you ever heard of people upgrading to long arm/ind 3 or 4 link suspension systems w only 2.5 inches of lift? Would you gain significant ride quality/off road flex? Or at that height would the benefits not be apparent?
You could that, sure. Anything is possible with enough eyeballing and thought.

Marcus


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