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New! Read the article Maximum Motorsports Tames Fox & SN95 Mustang Rear Suspensions on FordMuscle.com.

MRT Exhaust! MM now offers premium MRT cat-back exhaust systems for 1996-2004 Mustangs.

New! for Street & Strip Mustangs! Big-bore rear wheel cylinders for 1979-1993 Mustang with 9" drum brakes. Improves braking when running big rear tires and front skinnies, and/or different OEM front brakes.

New! Swapping a Coyote into a Fox Mustang? MM's Hydroboost Conversion Kits allow easy installation of a 1996-2004 Mustang Hydroboost power brake assist unit into a 1979-1993 Mustang.

New! Swapping an IRS into your Fox Mustang? MM makes it easier with a brake line kit made just for this conversion. Bolts-in, with no cutting or flaring of brake lines. Designed to fit standard IRS brake hoses.

New! MM's billet aluminum Pedal Box Spacer for Fox Mustangs. Replace the breakage-prone OEM plastic spacer when converting to manual brakes or Hydroboost.

Canadians! Please read the latest about ordering from Canada/shipping to Canada.

We've posted the parts list and link to the video of MM's Mustang in /DRIVE Tuner car Shootout

Drag Race Adjustable Rear Lower Control Arms, 1979-98 Mustang
Actual product may differ from photo.


  • Item # MMRLCA-34.1
  • Manufacturer: Maximum Motorsports


Larger Image

Drag Race series Rear Lower Control Arms, for 1979-98 Mustang, with adjustable-height spring perch and spherical bearings.

When your Mustang has Big Power (in the neighborhood of 600 to 1,000 ft-lb of torque at the rear wheels) you need rear lower control arms that are a step above the rest. Maximum Motorsports Drag Race series control arms provide the ride height adjustability essential to tuning for the optimum launch, along with the robustness required for hard launches at the strip with Big Power on slicks.

These Drag race control arms are intended for Mustang's with a power level exceeding the 600rwhp rating of MM's curved adjustable control arms. The straight tube of these control arms was designed for launching a 3,800 lb Mustang cutting a 60-foot time as quick as 1.20 seconds. That rating is for a standard 4-link suspension. If you Mustang is equipped with a torque-arm, the loads on the rear lower control arms are much lower, and therefore he MM Drag Race control arms can handle even more than 1,000 t-lb of torque at the rear wheels.

Ride Height Adjustment Range

  • When adjusted to the lowest ride height possible, your Mustang will be approximately 0.5" higher than it would be with a stock-style control arm and the same spring, due to the height adjuster mechanism. This dimension is with both spring isolators in place.
  • Remove the lower spring isolator, and when adjusted to the lowest ride height possible, your Mustang will be approximately 0.4" higher than it would be with a stock-style control arm and the same spring.
  • Remove both the lower and upper spring isolators, and when adjusted to the lowest ride height possible, your Mustang will be approximately the same ride height as it would be with a stock-style control arm installed with the same spring and both spring isolators.
  • When adjusted to the highest ride height possible, your Mustang will be approximately 3.5" higher than it would be with a stock-style control arm and the same spring. The shocks may top out, having reached full extension, before this height can be reached.
Ride Height Adjustment Range


Spring perch position Lower isolator Upper isolator Ride height change, relative to stock RLCA
Down In place In place +0.5"
Down Removed In place +0.4"
Down Removed Removed No change
Up In place In place +3.5"
Up Removed Removed +3.0"


  • Does not have any provision for attaching a stock-location swaybar. Use the MM rear anti-roll bar.
  • Fine tuning of spring rates in 25 lb/in increments is possible by using this control arm along with standard coil-over springs and the MM 2.5" rear spring adapter.
  • Adjustable ride height lets you change your Mustang's instant center location to tune the anti-squat percentage for optimum traction.
  • Improves traction by eliminating unwanted sources of deflection.
  • Eliminates deflection allowed by rubber or urethane bushings.
  • Eliminates deflection allowed by the stock stamped-steel control arm.
  • Does not cause the suspension binding typical with common urethane bushings and solid bushings.
  • Wheel hop is eliminated or greatly reduced once deflection is eliminated; the quad shocks are often unnecessary.
  • Improves rear suspension stability and consistency.
  • Easy adjustment; no need to jack your Mustang up off the ground.
  • Fits both stock-style springs and 2.5" coil-over style springs.
  • Large spherical bearing at both ends of each control arm completely eliminates unwanted deflection, while allowing proper articulation of the suspension.
  • Plated steel reducer inserts in the spherical bearings, sized to fit the stock hardware.
  • Strong and stiff round steel tube construction.
  • Adjustable-height spring perch.
  • Durable black powder coated finish.
  • Aluminum jack-bolt is hard-anodized.
  • Grease fitting to easily lubricate jack-bolt threads.
  • Designed and manufactured by MM in the USA.
  • Pair of assembled rear lower control arms
  • Urethane end cap shields for spherical bearings
  • Mounting bolts and nuts
  • Grease for the urethane end cap shields
  • Installation instructions


  • 1979-1998 Mustang with a solid axle
  • Fox chassis Fairmont, Zephyr, LTD, and Marquis

Does NOT fit

  • 1999-2004 Mustang with a solid axle because of the different mounting bolt size used during those later model years
  • Fox chassis Thunderbird due to differences in control arm length
  • Fox chassis Lincoln Mark VII with airbag suspension due to lack of proper spring perch on chassis
Tech Info

You can read Maximum Motorsports' detailed MMRLCA-34.1 Rear Lower Control Arm installation instructions before purchase.