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How to Install a QA1 Adjustable Rear Upper Control Arms on your 1979-2004 Mustang

Installation Time

3 hours

Tools Required
  • Floor Jack
  • Torque Wrench
  • Jack Stands
  • Blue Loctite
  • Tire Chocks
  • Grease Gun
  • 18mm socket and wrench
  • Lug Wrench
American Muscle
Shop Parts in this Guide

ASSEMBLY INSTRUCTIONS
QA1 Adjustable Trailing Arms 1979-2004 Mustang P/N 5255
READ ALL INSTRUCTIONS CAREFULLY ANDTHOROUGHLY PRIOR TO STARTING INSTALLATION. PRODUCTS THAT HAVE BEEN INSTALLED ARE NOT ELIGIBLE FOR RETURN. USE THE PROPER JACKING LOCATIONS. DEATH OR SERIOUS INJURY CAN RESULT IF INSTRUCTIONS ARE NOT CORRECTLY FOLLOWED. A GOOD CHASSIS MANUAL, AVAILABLE AT YOUR LOCAL PARTS STORE, MAY ALSO AID IN YOUR INSTALLATION.
• DISCLAIMER / WARRANTY •
QA1 WARRANTS THAT THE PRODUCTS WILL BE FREE FROM DEFECTS IN MATERIAL AND WORKMANSHIP FOR ONE YEAR FROM DATE OF SALE TO THE ORIGINAL PURCHASER. QA1 MAKES NO OTHER WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. QA1 SHALL HAVE NO OBLIGATION UNDER THE FOREGOING WARRANTY WHERE THE DEFECT IS THE RESULT OF IMPROPER OR ABNORMAL USE, YOUR NEGLIGENCE, VEHICLE ACCIDENT, IMPROPER OR INCORRECT INSTALLATION OR MAINTENANCE, NOR WHEN THE PRODUCT HAS BEEN REPAIRED OR ALTERED IN ANY WAY. QAl'S LIABILITY IN THE CASE OF DEFECTIVE PRODUCTS SUBJECT TO THE FOREGOING WARRANTY SHALL BE LIMITED TO THE REPAIR OR REPLACEMENT, AT QAl'S OPTION, OF THE DEFECTIVE PRODUCTS.
THE USER UNDERSTANDS AND RECOGNIZES THAT RACING PARTS, SPECIALIZED STREET ROD EQUIPMENT, AND ALL PARTS AND SERVICES SOLD BY QA1 ARE EXPOSED TO MANY AND VARIED CONDITIONS DUE TO THE MANNER IN WHICH THEY ARE INSTALLED AND USED. QA1 SHALL BEAR NO LIABILITY FOR ANY LOSS, DAMAGE OR INJURY, EITHER TO A PERSON OR TO PROPERTY, RESULTING FROM THE INSTALLATION, DIRECT OR INDIRECT USE OF ANY QA1 PRODUCTS OR INABILITY BY THE BUYER TO DETERMINE PROPER USE OR APPLICATION OF QA1 PRODUCTS. WITH THE EXCEPTION OF THE LIMITED LIABILITY WARRANTY SET FORTH ABOVE, QA1 SHALL NOT BE LIABLE FOR ANY CLAIMS, DEMANDS, INJURIES, DAMAGES, ACTIONS, OR CAUSES OF ACTION WHATSOEVER TO BUYER ARISING OUT OF OR CONNECTEDWITH THE USE OF ANY QA1 PRODUCTS. MOTORS PORTS ARE DANGEROUS; AS SUCH, NO WARRANTY OR REPRESENTATION IS MADEAS TO THE PRODUCT'S ABILITY TO PROTECT THE USER FROM INJURY OR DEATH. THE USERASSUMES THAT RISK!

REMOVAL OF STOCK TRAILING ARMS
1. Place the car on level surface and place tire chocks in front of and behind front tires.
2. Support rear of the car on jack stands and remove the rear wheels.
3. Place a floor jack under the differential and lift up slightly to remove tension from the trailing arm bolts - make sure not to lift the car off the jack stands.
Note: Keep jack under car during the complete removal and installation procedure.
Do not remove both trailing arms at the same time or the axle will rotate and the trailing arm installation will be much more difficult.

4. Start with either trailing arm and remove the rear bolt. Note: Re-Install the bolts in the same direction as original.
5. Remove the front trailing arm bolt.
6. Remove the trailing arm.
7. Clean frame at trailing arm pivot area with a wire brush.

This guide applies to Vehicle years: 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 and Submodels: Bullitt, Foxbody, Mach 1, V6, Cobra, GT