• Eliminates deflection allowed by stock rubber bushings
• Reduces wheel hop because there is no bushing deflection
• Precisely locates the control arms for improved dynamic alignment
• Handling is improved because there are no unpredictable camber or toe changes caused by bushing deflection
• NVH and ride comfort are virtually unchanged
• Much easier to install than urethane control arm bushings
• Installation tools included
• Also available as part of a package with other IRS parts

• Delrin bushing shoulders are chamfered for ease of installation, and to reduce sliding-friction contact area with the subframe tabs.
• Upper control arms are served with less expensive single-sided bushings because the thrust loads into the upper arm bushings are much lower than the loads the lower control arm bushings must endure.
• Zinc-plated steel crush sleeves
• Tools to straighten the subframe control arm mounting tabs, designed by MM, are included to assist in flattening the tabs before reinstalling the control arms with the new Delrin bushings. The mounting tabs are always distorted during the original installation of the control arms on the assembly line. Tab straightening is a critical step that ensures that the control arms pivot freely, without binding.
• Tools are included to easily remove the original bushings. Designed by MM, these tools make bushing removal an easy job taking only a few minutes, instead of a lengthy nightmare.
• Teflon-based lubricating grease is included. This is one of the best greases in the world, and is successfully used in applications a thousand times harsher than Mustang control arm bushings.
• Gloves are included to keep the super-sticky grease off your hands

Fits
1999-2004 Cobra IRS stock upper control arms and IRS subframe, regardless of the year of the chassis the IRS is installed in.

Does NOT fit aftermarket upper control arms.

Bushing Deflection
Eliminating the deflection allowed by the stock rubber control arm bushings improves handling and reduces wheel hop. These Delrin bushings precisely locate the rear control arms, and maintain rear wheel alignment in a manner that is impossible with the compliant stock rubber bushings. While rubber bushings provide the best noise and vibration reduction, they provide only barely adequate suspension control. Rubber bushings cannot accurately position the control arms well enough to achieve maximum performance from the suspension.

Wheel Hop
Wheel hop is the biggest complaint about IRS-equipped Mustangs. The un-damped compression of the rubber bushings in the rear suspension is the primary cause of wheel hop. That un-damped movement is amplified by repeated loss of traction. Wheel hop occurs because the rear tires continually oscillate between losing and then regaining traction. The extremely soft stock rubber bushings are the biggest contributor to this oscillation. The rubber compresses easily and then springs back, over and over again. To reduce wheel hop the stock rubber bushings must be eliminated.

IRS Mustang Tech: Q&A

You can read Maximum Motorsports' highly detailed MMIRSB-2.1 IRS Delrin Upper Control Arm Bushing Kit installation instructions before purchase.