Iron Rock Rear A-arm
- Thread starter vlad588
- Start date
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JeepJeepster
Full Access Member
I have it... Seems to be working good.
I have had the big nut come loose once but I assume its b/c I dont have a wrench that big and used a pipe wrench to tighten it.
I have had the big nut come loose once but I assume its b/c I dont have a wrench that big and used a pipe wrench to tighten it.
Good upgrade since JBA no longer makes his
But what exactly is upgraded, does rear suspension ends up with more articulation?
Offroad Bob
OffroadBob
Yes it does plus it won’t wear out the bushings every 6 to 8 months. I’ve been running one for about a year now and it’s much better than stock. If you get the optional flex joints, it allows it to transmit more road noise but that’s why I have a 300 watt stereo so I can drown it out. I too had problems with the adjusting nut on the mount to the rear end coming loose so I took a cold chisel and boogered up one thread lightly to stop it from backing off. Locktite didn’t hold it
Are these flex joints worth getting, especially considering the extra road noise?
Are these flex joints worth getting, especially considering the extra road noise
Offroad Bob
OffroadBob
If I still had a stock A-arm I’d be changing the bushings and ball joint again. It is easier to buy a whole new arm. Mine is still tight with no slop in it. I have the adjustable lower arms too. They have shown no sign of wear yet. My stock lower arms also had the bushings wear out where it attaches to the unibody. When that happens the rear end is able to “walk” around so when you accelerate, the rear end would shift. It would feel like the rear was sliding or you had a low or flat tire. Same thing would happen when you let off the gas or applied the brakes as it would shift the other direction. It was very unnerving to drive even after I got used to it doing that. Again I opted for the flex joints over the stock bushings on the lower arms. I just set the new arm next to the old ones and adjusted them to the same length. After installation you need to get the pinion angle checked to make sure the rear diff and the transmission are on the same plane with each other so you don’t wear out u-joints and pinion bearings and seal. I’ve added pics of the flex joint unassembled and installed. The joint has two poly half’s that encircle the joint and then are clamped together to hold the joint. It kind of resembles a U-joint with only one axis.
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Johnny O
Just hangin' out.
Worth every penny. Better bushings and such. Don’t care that it’s adjustable, me.
These pics makes the "stock" uca look cheap...I was only gonna purchase the uca, but now, I'm getting all 3 links. 125 miles a day, on rough country roads, this set up right here has to be a game changer. I did an oem uca replacement in Nov of 2021. 6 months later? Both bushings have torn internally on the front side of the bushing. Obvious that angle change from the height with the OME springs and Bilst shocks stresses these bushing. PROVEN RESULTS HERE! So, wife ain't gonna be happy, cause that changes the budget. But this set up has to be WAY better than the stock version. In my opinion.
Can't wait to get these parts!!!
By the way, did you order them in red?
Offroad Bob
OffroadBob
They only come black as far as I know. I painted mine to liven it up down there !
duderz7
Full Access Member
You can source the lowers from core 4x4 iirc, I think they look better,have more options and don't waste time putting useless sway bar mounts on them. I just recently got my recall lower links, but when they need replacement it'll be the core ones.
What about the extra road noise, is it really noticeable and objectionable at highway speeds that a radio needs to be cranked up?
JeepJeepster
Full Access Member
The only time I notice the extra road noise is at low speeds. I don't notice it at all at higher speeds, other noises drown it out...
Love the color
JeepJeepster
Full Access Member
Speaking of looking good, it annoys me that they made it so the writing couldnt be read once the a arm is installed. Why wouldnt they want you to be able to read it while you were laying under there?
I run the JBA bolt on set up uppers on two of my KJs
and Core 4X4 lowers
drive over 95 miles a day, ( dirt roads /twisty, pot holed 2 lane roads ) small amount of somewhat more noise but hardly noticeable really, you get used to it
I have the rubber bushing'd version of it and I am very happy with it. The bushings cups are welded on at a slight angle so that ride height there is very little flex for the bushings, when compared to the stock upper rear control arm.
The adjustability is nice to get the output of the transfer case and the input pinion of the rear axle perfectly parallel to reduce driveline vibrations.
The adjustability is nice to get the output of the transfer case and the input pinion of the rear axle perfectly parallel to reduce driveline vibrations.
