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J&M Weight Jacker Rear Lower Control Arms; Street/Race (79-98 All)

Item 30032
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Market Price $335.99 You Save 9% ($30.25)
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$305.74 (pair)

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      Product Information

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


      • Better Traction, Faster Launches, Less Wheel Hop
      • Improve Cornering Performance
      • On Car Height Adjustable
      • 3 Piece Poly-Ball Bushing - Chassis Side
      • Chromoly Teflon Lined Spherical Bearing - Axle Side
      • Intended for Street or Race Use
      • Sold as a Set of Two
      • Fits All 1979-1998 Model Mustangs


      Improve Traction. If you're not "hooking up" off the line then a set of J&M Weight Jacker Rear Lower Control Arms are the answer to your problem. These lower control arms will eliminate wheel hop, and improve traction keeping your Mustang's rear end planted for straight-line traction and cornering performance.

      Height Adjustable. J&M Weight Jacker Rear Lower Control Arms allow the driver to adjust the rear ride height for perfect launches every time. Lower your Mustang 1" or raise it by 2" by using a NASCAR style weight jack system.

      Superior Construction. J&M's lower control arms are manufactured from high strength 2" round steel tubing, making them lighter, stronger, and more resilient to bending than the competitors rectangular or square tubed control arms.

      Bind-free Design. These control arms feature a Patent Pending 3-piece Poly-Ball bushing on the chassis side that incorporates a very hard inner polyurethane ball surrounded by two soft polyurethane outer cups. The axle side features a Chromoly Teflon lined spherical bearing that eliminates any unwanted bushing bind and deflection. The result is great traction during straight-line acceleration and predictable grip during hard cornering.

      Application. These J&M Weight Jacker Rear Lower Control Arms are designed for street or race use on all 1979 to 1998 Mustangs, including the LX, V6, GT, and SVT Cobra models. Sold as a set of two control arms.

      Fitment: 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2003 2004 Details

      MPN# 23958

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (12)

      Write a Review

      Ratings Summary

      4.9 out of 5 overall rating from 12 customers

      Installation Time: Afternoon

      • March 27, 2019

        5 1996 Cobra - MichaelS Installation Time: Less than 1 Hour

        Good product

        Got these control arms after a shipping failure from another manufacturer. These showed up promptly and I was pleased with the overall quality out of the box. The welds are good and steel is thick and high quality. I read some other reviews which complained about how difficult the spherical bushings were to install, but I had NO problems at all. I was disappointed that there were no torque specs included in the instructions so I referranced another manufacturers spec. Went on as expected and I have only put about 10 miles on them but the car hooks and handles much better. I was surprised at how much it cut down the body roll in the rear. Overall high quality part at a very good price. I put 1 hour install but it was more like 1.5 hours

        Helpful (0)
      • January 23, 2018

        5 1989 LX - Blownlx Installation Time: Less than 1 Hour

        Great prod

        Very easy install and quick to do. Also looks amazing. Great product

        Helpful (5)
      • November 07, 2017

        5 1990 LX - BrentJ Installation Time: Less than 1 Hour

        Great Product

        Great for setting ride height and for better traction. Also helps handling.

        Helpful (5)
      • July 18, 2017

        5 1989 GT - Chad90 Installation Time: Shop Install


        love these arms, work great and i love how i can adjust my ride height on the fly. install was easy and did not take long

        Helpful (5)
      • July 01, 2017

        5 1984 Other - ChadH Installation Time: Afternoon

        Well built, nice product

        I am running a 3-link torque arm and panhard bar rear suspension in my '84 GT. I wanted some LCAs that allowed maximum articulation and minimum bind. The spherical bearings on the axle end and the 3 piece polys on the chassis side do a great job of eliminating any bind potential while providing a very solid method of locating the axle. With conventional rubber bushings, there's a lot of slop and deflection. With hard poly bushings, there's a lot of bind. This is the best way to solve both issues. The metal sphericals on the axle side and the stiff polys WILL unavoidably transmit more road and axle noise to the chassis than a stock setup, but it's worth the performance increase on a corner carver. I haven't swapped to coilovers on the rear yet, so the jack-screw design was necessary to match my coilover adjustability on the front of the car. Everything else on my suspension is Maximum Motorsports, but I bought these based on a recommendation of them being comparable to the MM arms. I don't regret the purchase at all.

        Helpful (6)
      • March 19, 2014

        5 1993 Cobra - LethalSVT Installation Time: Afternoon

        Great Product

        After waiting for the back order i finally got my control arms. Install was less than hour. The welds look like they have strength and quality in mind. Unlike cheaper knock offs or sub par copies. Can't wait to see how they perform at the track. As for stance having the adjustability is a huge plus. I recommended these to a friend who has purchased these and is awaiting arrival.

        Helpful (5)
      • February 21, 2014

        5 1987 Other - joe111 Installation Time: Less than 1 Hour

        nice parts

        Im swapping these for the street version of the same model ive beem running for the last 6 years..theyve taken a ton of abuse and are still holding up

        Helpful (6)
      • November 14, 2013

        4 1998 GT - 98blkout Installation Time: Afternoon

        J&M makes a quality product!

        I installed both the J&M weight jacker rear lower control arms and upper control arms. The install went smoothly and the lower control arms gave me the adjustment needed to give my car the stance I was looking for. At the track my 60ft times decreased from an average of 2.35 to 1.9, which makes a huge difference in the 1/4 mile. I would definitely recommend to others as it works great at the track and does not effect drivability on the street.

        Helpful (6)
      • September 27, 2013

        5 1998 Cobra - JerryCarGuy Installation Time: Afternoon

        ride height is easy to adjust.

        after installation, car seems to hook a little better and launches straight Only downfall is a little noise from spherical bearing on rear side of control arm.

        Helpful (5)
      • September 24, 2013

        5 1990 GT - 331blackfox Installation Time: Afternoon

        awesome lower control arms!

        Fit great, install was simple, and can feel a difference without a harsh ride. Read the reviews ,hoping I made the right decision and i did! Thanks A.M. for making my purchase quick and easy!

        Helpful (4)

      Questions & Answers (1 answers)

      1 Top Rated Question

      What locks the spring seat height adjustment in place?

      • There will be a knob that allows you to lock the adjustment in place

      Helpful (0)
      Post Your Question

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (2) rear lower control arms
      • (2) 3-piece poly-ball bushings
      • (2) 2-piece metal bushings
      • (2) Steel sleeves

      Tech Specs

      Will It Fit My Mustang

      • Cobra - 93, 94, 95, 96, 97, 98, 99, 00, 01, 03, 04
      • Cobra R - 93, 95
      • GT - 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98
      • LX - 87, 88, 89, 90, 91, 92, 93
      • Other - 79, 80, 81, 82, 83, 84, 85, 86
      • V6 - 94, 95, 96, 97, 98

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