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J&M Extreme Joint Rear Lower Control Arms; Black (05-14 All)

Item 30020
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$176.90 (pair)

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      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Better Traction, Faster Launches, Less Wheel Hop
      • Improve Cornering Performance
      • Exclusive Bind-Free Design
      • Hassle-Free Installation Requires No Modifications
      • Sold as a Pair
      • Fits 2005-2014 V6, GT, Bullitt and GT500 Mustangs


      Control Your Control Arm Flex. Improve your Mustang's straight line acceleration and cornering grip at the same time with these Extreme Joint Mustang Lower Control Arms from J&M. With your stock lower control arms, the exceptionally soft OEM rubber bushings insure your control arms don't bind, preventing undesirable handling characteristics like snap oversteer. However, if you try to accelerate or stop quickly in your 2005 - 2012 V6, GT or GT500 Mustang and you're likely to experience wheel hop or rear end instability. Control your control arm flex with J&M's Extreme Joint Mustang Lower Control arms and go faster - everywhere.

      Better Handling. With J&M's exclusive design, you get the benefits of a rigid bushing, resulting in better straight-line grip, but the performance of a spherical bearing under cornering, so you get the best of both worlds. The exclusive design of these lower control arms features a steel inner ball surrounded by polyurethane outer cups. The result is great traction during straight-line acceleration, and bind-free performance during spirited cornering for predictable grip.

      Quality. Though harder to work with, J&M selected round tubing for its superior strength and resilience to bending and torsion when compared with rectangular or square tubing, while also being lighter. With an offset design to guarantee bind free geometry, these lower control arms are the perfect suspension upgrade to your 05-14 V6, 05-14 GT or 07-12 GT500 Mustang.

      Fitment: 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 Details

      J&M 23942B

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (71)

      Write a Review

      Ratings Summary

      4.9 out of 5 overall rating from 71 customers

      Installation Time: Afternoon

      Installation Cost: 0-$100

      • May 04, 2020

        5 2014 GT - Mark2014GT Installation Time: Afternoon

        2014 GT Premium

        Upon opening the box you will see the high quality of these LCA’s, extremely well built. After install on my 2014 GT premium, it felt like a different car! Wheel hop is eliminated. Equally important is the greatly improved cornering! The rear end stays tight and planted over sweeping entrance ramps with expansion joints in the road. This upgrade will put a smile on your face.I am very impressed with these LCA’s and would buy them again.

        Helpful (1)
      • March 22, 2019

        5 2012 GT - baytoys Installation Time: Less than 1 Hour

        What wheel hop lol

        A must-have product install these on my 2012 Mustang GT premium and there is a big night and day difference taking Corners a lot harder and stiffer then the car has ever been and there is no wheel hop at all since I've installed these install was pretty straightforward had to use a press to get the bushings in besides that I'm loving them thanks American Muscle and JandM

        Helpful (0)
      • November 12, 2018

        5 2011 GT - Nicholas Installation Time: Less than 1 Hour


        They worked great. Really came in clutch when I needed them thank and very fast delivery. Thank you!!

        Helpful (2)
      • May 04, 2018

        5 2008 GT - GregoryL Installation Time: Less than 1 Hour

        Nice product!

        It was a breeze to install. Wish the bushings had been pre-pressed but hammering them in wasn't too difficult. A press or vise would be a much better option. They tightened up the floppy rear by a large margin. I still have mistery squeeks so I have a few more components to replace yet. Upper and panhard next.

        Helpful (4)
      • July 20, 2017

        5 2013 GT - DanM Installation Time: Less than 1 Hour

        Great part, highly recommend.

        I replaced the rear lower control arms and the 55D rear springs with the Steeda Sports and the JandM at the same time. Made a very noticeable difference. Before, there was a rubbery feeling to the rear end. Now, it seems the front end could be stiffened. A slight increase in NVH but not enough to worry about. During assembly to help with alignment of the control arms, jack up the front part of the pumpkin to rotate the rear end into proper position.

        Helpful (8)
      • June 08, 2017

        5 2014 GT - Manuel316 Installation Time: Afternoon

        No more wheel hop!

        Eliminated all wheel hop on my 2014 GT Track-pack. Have to be regressed when winter starts to roll around but its really easy! Overall, solid buy!

        Helpful (5)
      • March 04, 2017

        5 2013 Boss - DennyE Installation Time: Less than 1 Hour

        No more wheel hop

        Great product went in with no problems took about 30 minutes on a lift. Little difficult to get torqued to 129 lbs. but not bad. I am getting a little noise from them on bumps but I didn't have a grease gun available at time of install. Hopefully grease will fix the noise

        Helpful (5)
      • September 26, 2016

        5 2007 GT - MustangMan

        Well made product that works!

        Chose the JandM Extreme control arms because of other reviews, and the spherical bushings. Came with great instructions, plenty of lube for the front bushings, and went on easy. No noise or NVH from them so far, all is quiet, and no wheel hop, which is why I did my research before buying. The quality shows right out of the box.

        Helpful (5)
      • July 20, 2016

        5 2011 GT500 - Pablo

        Great product and price

        Very pleased with these control arms. Build quality appears to be high quality. Poly front-end and spherical rears does not add to any added noise I can hear. Maybe a little more feeling (vibration/harshness) than before but I consider this a plus as it is now easier and faster to determine what's happening back there. Install was very easy with online instructions and I'm and artist not a mechanic. I did this with my 15-year-old son on a lift.

        Helpful (5)
      • May 16, 2016

        3 2012 GT - ARMustang Installation Time: Afternoon

        J M rear lower control arms

        These fit well and look well made. However, I installed them to control axle hop and after installation I still have axle hop. It's nearly as pronounced as before when accelerating from a roll. From a standing start, axle hop is reduced by about 50 or a bit more. I will try an upper control arm replacement next.

        Helpful (5)

      Questions & Answers (6 answers)

      5 Top Rated Questions

      Would this effect the traction control in adverse conditions? I'm sure this is a stupid question but my 2012 5.0 with 3.73 gears has entirely to much wheel spin but living in Alaska when I push the magic button during winter snow (traction control) the car is simply amazing. Was just wondering if this product would hurt that?

      • No. This product is designed to keep your axle planted to prevent wheel hop. The axle ultimately is more stable, slightly improving traction. Should have no negative effects on your car.

      Helpful (1) Show 2 more answers

      What kind of grease is best for these?

      I have a few questions: 1) What holds the bushing halves together (squeezing the ball) inside the LCA end? 2) Is the amount of tension (or squeeze) applied to the rotating assembly adjustable? 3) Does this tension have to be readjusted as the bushings wear? 4) Is the Extreme Joint in both ends or just one end? Which end, axle or body side? 5) Are the extreme joints rebuild-able, and are replacement parts readily available? Thanks! You all at American Muscle are awesome!!

      Relocation after lowering? Once I have these on my car when I decide to add lowering springs in the future will I need to use a relocation bracket for these?

      • Lower control arm relocation brackets are not required when lowering your Mustang.

      Helpful (0)

      lowering If I decide to lower my car would these effect my traction in a negative way since they are not adjustable?

      • It depends on how much you lower your car. You may need relocation brackets to correct the angle, otherwise the geometry is affected in such a way that lower control arms can actually "lift" the axle. This is not specific to J M Extreme Rear Lower Control - It applies to ALL rear lower control arms.

      Helpful (0) Show 2 more answers
      Post Your Question
      1 More Question
      Alignment? I didn't think so, but now I'm not sure. Do you need an alignment after installing these? 5 answers

      Installation & What's in the Box

      Installation Info

      What's in the Box

      Hardware included:
      • (4) Polyurethane bushings
      • (2) Short zinc-plated steel sleeves
      • Polyurethane grease

      Tech Specs

      Will It Fit My Mustang

      • Boss 302 - 12, 13
      • Bullitt - 08, 09
      • GT - 05, 06, 07, 08, 09, 10, 11, 12, 13, 14
      • GT500 - 07, 08, 09, 10, 11, 12, 13, 14
      • V6 - 05, 06, 07, 08, 09, 10, 11, 12, 13, 14

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