Springs; Wiring Harness - Factory Five Racing Mk4 Roadster Assembly Manual

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.

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
1979-04 Production Spring Rates (lbs./in.)
Mustang
YEAR V-8
1979 F395/R160
1980-81 F370/R160
1982 F395/R160
1983-84 F410/R160
F425/R200
1984.5-93
F525/R300
F425/R200
1993
F525/R300
F400/R165
1994
F500/R265 F400/R160
F400/R165
1995
F500/R265 F400/R160
F400/R165
1996-98
F500/R265 F400/R160
1999 F450/R210 F500/R470
2000 F450/R210
2001-02 F450/R210 F500/R470*
2003 F450/R210 F600/R600*
2004 F450/R210
*Convertible F500/R470
www.factoryfive.com
Cobra™
Cobra™ "R"
F425/R160 F750/R240
F525/R160 F850/R260
F700/R200
F850/R260
F800/R750
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