FAQs & Tech Tips

MM News

NASA Racers! MM will support NASA road racers with $1,000 contingency prizes for the American Iron, American Iron Extreme, and Spec Iron at the 2019 National Champions. You must register to be eligible.

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

Mustang Rear Upper Control Arm Bushings, Axle/Differential Side, pair
Actual product may differ from photo.


  • Item # E4SZ-5A


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Fits 7.5" and 8.8" solid rear axle Mustangs from 1979 through 2004.

MM's Rear Upper Control Arm Bushing Tool makes it much easier to remove the old bushings and install these new bushings. Watch the video - Click on the Video tab above to see the tool in use.

  • Replace differential side (aft) upper control arm bushings when installing new rear upper control arms on your solid axle equipped Mustang.
  • Two bushings are included to replace the aft bushings in the axle/differential housing for each upper arm.
  • The bushings are pressed into Mustang 7.5" and 8.8" axle housings using our special tool.
  • The chassis side (forward) upper control arm bushings are integral with the arm.
  • Never replace rear upper control arm bushings with urethane, due to induced binding, and resulting chassis damage.
  • Upper control arms must rotate and pivot with axle motion, and rubber is the only material that sufficiently allows for this twisting without chassis damage.

Our bushing removal and installation tool (MMT-1) makes the replacement of this bushing very easy. Given that the last Mustangs using these bushings (2004 model year) are now well over 8 years old. Your Mustang is due for replacement of these bushings, especially if you do any track or performance driving. If you haven't yet converted to a torque arm (which eliminates the upper arms entirely), these are the only upper control arm bushings we recommend.

  • We have two sources for these bushings: Ford, and a trusted vendor.
  • Our engineering staff has determined that both sources deliver bushings from the same manufacturer, and bushings from both sources are of equal quality.
  • Bushings are intermingled when stock is rotated with each new delivery, so we are unable to tell the purchaser which source their bushings are going to come from.