Rokmen Lower CAs - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 14 Old 05-29-2011, 10:05 PM Thread Starter
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Rokmen Lower CAs

Just received and installed my front and rear lower adjustable control arms from Rokmen. I’ve been a customer of Dave’s since the early days of Rokmen and his stuff keeps getting better and better. Had his front upper and lower CAs on my TJ so it was only natural for me to wait until he had his Control Arms ready to go for the JK. Well…here they are:

Front lowers pre-installation – Johnny Joints at the axle and frame, beautifully double TIG welded and powder coated…



Shot of fronts post installation…



Rears post installation (can’t see very well and didn’t take a pre-installation shot…sorry)…



What a difference in handling. After my OME lift installation (yielding 3-1/4" of lift, with Currie front adjustable trac bar, rear relocation trac bar bracket and JKS quick discos up front) she was jerking all over the place. I’m amazed at the difference a little caster makes. I’m now running approximately (I say approximately because I’m using one of those POS angle finders from Lowes) 4.5-degrees on the passenger’s side and 6.5 on the driver’s side. Now she handles like a dream.
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post #2 of 14 Old 05-29-2011, 10:29 PM
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-How is the price comparison on these vs. Currie? They look almost identical.

-Why the 2 degree caster difference?

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post #3 of 14 Old 05-30-2011, 12:17 AM
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Quote:
Originally Posted by axsys View Post
-How is the price comparison on these vs. Currie? They look almost identical.

-Why the 2 degree caster difference?
x 2
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post #4 of 14 Old 05-30-2011, 12:09 PM
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Those look like Currie arms to me.

I went to the Rokmen sight, and I didn't see Rokmen arms for a JK.


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post #5 of 14 Old 05-30-2011, 02:05 PM Thread Starter
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Sorry for the delayed response.

Price is about the same as Currie. Contact the Rokmen team for specifics.

The difference? Rokmen uses thicker tubing, dual pass TIG welds on the bungs (amazing quality), lifetime warrantee and second-to-none customer service.

Like I said, I've been buying from Dave (Rokmen owner) for over 12-years now. He's been making TJ components (bumpers, sliders, corners, skids, CAs, etc.) for more than that. I'm excited that he's now into JKs.

Planman - these are brand new. So new that he doesn't have them on his site yet. I think I'm the first to get 'em.
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post #6 of 14 Old 05-30-2011, 02:13 PM Thread Starter
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Quote:
Originally Posted by axsys View Post

-Why the 2 degree caster difference?
Oh...forgot about this. From what I understand, the factory does this intentionally to compensate for road crown. Now...is it 2-degrees? Maybe, maybe not. I'm using a cheap-o angle finder from Lowes. I'll know for sure the next time I decide to get an alignment. However, the difference in handling is night hand day.
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post #7 of 14 Old 05-30-2011, 02:36 PM
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Nice setup, what uppers are you running? Is Rokmen finally getting into the JK market?
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post #8 of 14 Old 05-30-2011, 03:49 PM
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Quote:
Originally Posted by rubirobv View Post
Nice setup, what uppers are you running? Is Rokmen finally getting into the JK market?
You really don't need front uppers until you are at or above a 4" lift.

Check the link in my signature for an explanation of adjustable control arm purposes on a shorter lift.

He only bought front and rear lowers.

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Last edited by planman; 05-30-2011 at 03:54 PM.
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post #9 of 14 Old 05-30-2011, 06:08 PM Thread Starter
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Quote:
Originally Posted by rubirobv View Post
Nice setup, what uppers are you running? Is Rokmen finally getting into the JK market?
Yes, he is. E-mailed Dave and he said the lowers will be on the Rokmen site later this week.

I'm running stock uppers at the moment. Rokmen plans to have those available soon as well. However, I may wait to get the uppers. Now that I've extended the rear, my thrust angle is pushing the limit (about 14-degrees). No vibes at the moment, but I'd like to get a Tom Woods double cardan rear shaft anyway.
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post #10 of 14 Old 05-30-2011, 06:39 PM
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Quote:
Originally Posted by planman View Post
You really don't need front uppers until you are at or above a 4" lift.

Check the link in my signature for an explanation of adjustable control arm purposes on a shorter lift.

He only bought front and rear lowers.

Sent from my DROIDX using Tapatalk
By no uppers, you mean no adj uppers, right? I read it as no upper arms necessary. I'm curious to know if having johnny joints at both ends is a better option than having a flex joint at the frame and a rubber bushing at the axle? Which is what I have. Also, what would be less prone to binding, a flex joint or a heim joint? If that makes sense.
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post #11 of 14 Old 06-01-2011, 04:25 AM Thread Starter
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Follow-up...Rokmen now has their JK Adjustable CAs on the web site with pricing - Adjustable Lowers AND Uppers!
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post #12 of 14 Old 06-01-2011, 05:55 AM
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Quote:
Originally Posted by Brady View Post
Now that I've extended the rear, my thrust angle is pushing the limit (about 14-degrees).

You'd be going down the road sideways if your thrust angle was 14!


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post #13 of 14 Old 06-01-2011, 06:49 AM Thread Starter
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You'd be going down the road sideways if your thrust angle was 14!
Maybe my terminology is incorrect? Measurement at the shaft is 17.5-degrees. At the differential flange it's 3.5-degrees. Net 14-degrees.
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post #14 of 14 Old 06-01-2011, 07:26 PM
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Thrust angle is left/right wheel misalignment of an axle. ie, left or right wheel of an axle is forward or back by a certain distance, resulting in the thrust line of the rear axle pointing to the left or right, making you have to steer left or right to go in a straight line. The vehicle 'crabs' sideways slightly going down the road.

At 14 degrees thrust angle, you would be facing that angle to the left (or right?), as you went straight along the road.

I think you are talking about the driveshaft angles & the up angle of the diff. From memory this is the pinion angle, (the upward angle of the pinion gear in the diff). And you don't want it too high, or the diff oil cannot properly lubricate the bearings & seals there.
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