436
www.factoryfive.com 508-291-3443
they are thicker and are designed for a smaller 10” rotor. To use them, one of the shims tack welded
into the standard IFS bracket needs to be removed.
Rear 4 link control arms
Upper control and lower control arms stay the same from 1979 to 1998.
Front lower control arms
Front lower control arms from 1979 to 1993 all have the same dimensions and will work with any FFR
kit by following the simple modification shown below. In 1994 the control arms had a similar design,
though they increased in length by approximately ¾”. This arm can also be used by following the same
modifications as the 1979 to 1993 arms. There are two sets of holes on the Factory Five chassis to
mount the lower control arms. The inner holes are for the 1994 to 2004 Control arms, and the outer
holes are for the 1979 to 1993 arms. FFR offers a tubular lower control arm powder coated, with
polyurethane bushings, ball joints, and mounting bolts which are designed to mount in the outer chassis
mount hole.
Springs (MODIFICATION)
Rear springs from 1979 to 2004 will all fit an FFR kit with a slight modification as shown below.
Below is a chart of every spring rate from 1979 to 2004. These rates are for un-cut springs. In all cases
there are rubber isolation pads between the spring/control arm and spring chassis, which are a required
donor part for an FFR 4 link stock kit.
1979-04 Production Spring Rates (lbs./in.)
YEAR
Mustang
V-8 Cobra™
Cobra™
"R"
1979 F395/R160
1980-81 F370/R160
1982 F395/R160
1983-84 F410/R160
1984.5-93
F425/R200
F525/R300
1993
F425/R200
F525/R300
F425/R160
F525/R160
F750/R240
F850/R260
1994
F400/R165
F500/R265 F400/R160
1995
F400/R165
F500/R265 F400/R160
F700/R200
F850/R260
*Convertible F500/R470
Wiring harness
With all FFR EFI kits, the donor car wiring harnesses can be used. The 87-95 harness has 5 sections:
engine, rear, front, dash, and transmission. In 1990, Air bags were added to the Mustang. Within the
harness, this is a separate harness of a few wires that can be separated out easily. In 1996 Ford
introduced a Passive Anti Theft System (PATS) which put a transmitter inside the key (see Donor Parts
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