Edelbrock 5291 User Manual

EDELBROCK SUSPENSION

Sub-Frame Connectors

For 1994-2002 Mustang GT & 1999-2002 Mustang Cobra

Catalog #5291

INSTALLATION INSTRUCTION

Please study these instructions carefully before installing your new sub-frame connectors. If you have any
questions or problems, contact our Technical Hotline at: 1-800-416-8628 from 7 am - 5 pm, Monday through
Friday, Pacific Standard Time or e-mail us at: [e-mail].

Application: Designed for 1994-2002 Mustang GT and 1999-2002 Mustang Cobras. Edelbrock Subframe
Connectors have been designed to add strength to the vehicle by connecting the front subframe from the front
suspension cradle mounting points to the rear suspension trailing arm mounts. The Edelbrock subframe
connector has large welding area to resist flex, heavy wall 1 5/8 diameter tubing for stability, and is contoured
to the floor pan of the vehicle so as not to reduce ground clearance.

Tools Required:

1. Common hand tools

2. Drive-on lift (preferred) or floor jack & stands

3. Soft-backed angle grinder / sander

4. C-clamps or Vice grips

5. MIG welder

Notes:

1. Weld-on subframe connectors should be installed by a professional welder with a proper wire feed or
MIG welder. The installer should have an understanding of welding dissimilar metals. The subframe
is formed from thin gauge sheet metal. The bracket of the Edelbrock subframe connectors are made
form 1/8 thick hot rolled steel that has been laser cut and formed to the required shape allowing for
minimum of gap.

2. Subframe connectors should not be installed on a vehicle with subframe damage due to accident or
vehicles that have weak, unequal rate, or improper springs.

3. Due to high production tolerances and wear from age, some vehicles may require fitting of the
subframe connectors. This may require reshaping of the vehicles floor pan or subframe, or minor
grinding of the subframe connectors.

KIT CONTENTS

Qty. Part # Description

2 68-5710 5/16 - 18 x 1” hex head cap screw
2 23-2057 Nut tab
2 23-2104 Cross member reinforcement plate
1 23-2106 Left seat reinforcement bracket
1 23-2107 Right seat reinforcement bracket
4 68-8702 10mm - 1.50 x 40mm bolt
4 60-0242 10mm - 1.50 nyloc nut
8 82-5592 7/16 Flat washer
2 82-4100 5/16 Flat washer
1 25-4056 Left subframe connector
1 25-4057 Right subframe connector

©2002 Edelbrock Corporation

Page 1 of 3

Rev. 1/02

INSTALLATION INSTRUCTIONS

1. Place vehicle on a drive-on style of lift
(preferred) or lift vehicle so as to keep the
suspension loaded with the vehicle weight.
Spring rates must be equal from the left side to
the right side, and the weight of the vehicle must
be supported by the springs during installation
as if the vehicles were on its wheels. If vehicle
is support by its wheels, tire pressures must be
equal, check sidewall of tire for recommended
pressure. Vehicle must not be in a twist or bind
during installation; this condition would cause
the chassis to develop a preload.

2. Disconnect the battery. Pull the carpet or all
flammable materials away from the inside floor
pan in the foot wells on both sides of the
vehicles. Remove the 2 rear front seat retaining
bolts.

3. Unbolt any wiring, brake lines, and fuel lines that
are attached to the front or rear subframe near
to where the subframe connectors are to be
welded.
Note: Duct tape can be used to protect exposed
wiring or lines during welding.

4. Using the subframe connectors as a guide, mark
where there needs to be welding on the floor
pan and using the angle grinder / sander, clean
the area to be welded. The cleaner the area
where the weld is to be, the better and stronger
the weld will be (see Figure 1).

5. Weld all the floor pan pieces that are spot weld
at the factory and will be covered by the
subframe connectors after installation. This will
help the subframe connectors and keep the
factory spot welds from breaking where they
would be inaccessible after installation (see
Figure 2).

Fig. 2

6. Using the supplied nut tab, bolt, and washer
install the Edelbrock Subframe Connectors on
the vehicle. Slip the nut tab through the hole by
the pinch weld near the rear trailing arm location;
align it so the hole in the subframe connector
can be bolted up. Before completely tightening
the bolt, it will be necessary to install the seat
reinforcement brackets. The seat reinforcement
bracket installs with the connector slipping
through the notch in the bracket and the longest
tab of the bracket to the front of the vehicle. Bolt
the seat reinforcement brackets using the
supplied 10mm bolts and washers, going up
from the bottom through the brackets into the
factory nut plates welded to the floor pan. (see
Figures 3 & 4). In the front subframe area, make
sure the connector is seated up against the floor
pan. The gaps between the sheet metal and the
subframe connector should be minimized for
good weld quality. Use C-clamps or locking
pliers to hold the front of the connector in place.

©2002 Edelbrock Corporation

Fig. 1

Page 2 of 3

Rev. 1/02