Edelbrock Ford Mustang 63-5221 User manual

©2007 Edelbrock Corporation
Rev. 6/07 - DA/mc
Catalog #5221
Brochure #63-5221
Page 1 of 2
Edelbrock Trailing Arm
for 1979-2004 Ford Mustang
Catalog #5221
INSTALLATION INSTRUCTIONS
Please study these instructions carefully before installing your new Adjustable Trailing Arm. If you have any questions, contact our
Technical Hotline at: 1-800-416-8628, 7 am to 5 pm, Monday-Friday, Pacific Standard Time or
e-mail us at [email protected].
Tools and Supplies Required:
❑ Floorjack ❑15mm & 18mm sockets (1/2” drive) and combination wrenches
❑(4) Jackstands ❑Torque wrench, 1/2” drive 14”-16” extension
❑Tire chocks ❑Grease gun
❑Lug wrench ❑Blue Loctite™
❑Edelbrock trailing arm hardware kit #5216
for ‘79-’98 - optional; stock hardware may
be used if in good condition.
REMOVAL OF STOCK TRAILING ARMS
1. Place car on level surface and place tire chocks in front of and behind front tires
(See Fig. 1).
2. Support rear of the car on jackstands and remove the rear wheels.
3. Lift rear axle with floor jack to approximate ride height, then support rear axle with
jack stands
(See Fig. 2).
KEEP JACKSTANDS UNDER CAR DURING THE COMPLETE REMOVAL AND
INSTALLATION PROCEDURE.
CAUTION - DO NOT REMOVE BOTH TRAILING ARMS AT THE SAME TIME OR THE
AXLE WILL ROTATE AND TRAILING ARM INSTALLATION WILL BECOME MUCH
MORE DIFFICULT.
4. Remove rear sway bar. Remove clip nuts from sway bar
(See Fig. 3). Make sure
car is still firmly supported on jackstands.
5. Lift rear of trailing arm with floor jack so bolt can be removed
(See Fig. 4).
Remember, do one side at a time.
6. Carefully remove rear trailing arm bolt. CAUTION: Trailing arm is under tremendous
pressure from the rear spring. Be sure that the floor jack is sturdy and able to
control the release of tension in a smooth, controlled manner.
7. Carefully lower trailing arm, releasing tension on rear spring. Note that the opening
at the bottom coil of the spring is towards the rear of vehicle. It must be re-installed
in the same position or the ride height will be affected. Remove spring. Inspect the
rubber insulators on spring and replace with new Ford parts (#D8BZ-5536-A), if
necessary.
8. Remove front bolt and old trailing arm. A 14"-16" long extension will make it easier
to reach the bolt due to interference from the muffler.
9. Clean frame at trailing arm pivot area with a wire brush.
IMPORTANT NOTE:
Proper installation is the responsibility of the installer. Improper
installation will void warranty and may result in poor performance and
engine or vehicle damage. Fig. 1
Fig. 2
Fig. 3
Fig. 4

©2007 Edelbrock Corporation
Rev. 6/07 - DA/mc
Catalog #5221
Brochure #63-5221
Page 2 of 2
1. Install bushing sleeve in bushing using supplied grease. Bushing sleeve with small hole is for model years 1979-1998 and sleeve
with large hole is used for 1999–2004 model years.
2. Install new trailing arm with the grease fittings facing down and the sway bar mount toward the front of car. Arm stamped with
P/N 25-4003 is the left and P/N 25-4004 is the right.
3. Install the new trailing arm by locating the front bolt first. If the fit is too tight, grease
the outside edges of the bushing to help the arm slide into place. Install nut and bolt
but do not tighten at this time. The trailing arm should pivot smoothly in the chassis.
4. Re-install spring and all rubber insulation pieces, making sure that opening at
bottom of spring faces the rear of the car
(See Fig. 5) . Use a block of wood or
similar support between the floor jack and the trailing arm to prevent damage to the
zerk fitting
(See Fig. 6).
5. Place one drop of blue Locktite™ on clean threads and torque the nut to 70 ft./lbs
on both front and rear trailing arm bolts.
6. Repeat for other side.
7. Re-install sway bar with ends to outside of trailing arm sway bar mount. Use factory
bolts with supplied nuts and washers. Re-install E-brake cable clamp on rear most
sway bar bolt if equipped. Bracket may require minor modification.
8. You may want to finish your installation by lubing the front and rear bushings with a
grease gun. Be sure to replace the dust caps on the zerk fittings to prevent dirt and
corrosion from damaging the fitting.
Check all nut and bolt tightness after first 10 miles.
Edelbrock Corporation, 2700 California St., Torrance, CA 90503
Tech Line: 1-800-416-8628
E-Mail: [email protected]
INSTALLATION INSTRUCTIONS
Fig. 5
Fig. 6
Qty. Part # Description
❑ 125-4003 Right Arm Assembly
❑ 125-4004 Left Arm Assembly
❑ 8
-
Polyurethane Bushings (Pre-installed)
❑ 4
-
12mm ID Bushing Sleeves
❑ 4
-
14mm ID Bushing Sleeves
❑ 4
-
Grade C Lock Nuts
❑ 4
-
Flat Washers
❑ 4
-
Zerk Fittings
❑ 4
-
Zerk Caps
KIT CONTENTS