Factory Five Racing '33 Hot Rod, Assembly Manual

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kit. (More brake component information can be found in the High Performance Braking Systems section
of this Manual)
Year
Rear
End
Width
Rear Brake Type
87-93 59.25" 9" Drum
94-98 61.125" 10.50" Solid Disc (GT) 11.65" Vented Rotor (Cobra)
99-04 62.52" 10.50" Solid Disc (GT) 11.65" Vented Rotor (Cobra)
Rear axle
From 1986 to 2004 8.8” rear axles were used in Mustangs. In 1994 they went from a 4.25” 4-lug bolt
pattern to a 4.5” 5-lug bolt pattern. Most wheels fit the 59.25” width the best. Make sure you know what
axle you have before ordering wheels.
Starter
From 1979 to 1991 the V8 starters used were all the same one wire starters. In 1992 Ford switched to a
lighter, more powerful starter which had a built in solenoid, but required a second external solenoid for
wiring and they continue to use this starter.
Driveshaft
Driveshafts were unpainted steel with a 28 spline yoke from 1979 to 1993. This 28 spline fits into the T-5
and Tremec 3550. In 1994 Ford used a 31 spline yoke, which was used through 2004. This 31 spline fits
the T-45, the Tremec TKO, and the Tremec 3650. The Tremec T-56 used in the 2003-2004 Cobra
Mustang, and the 2000Cobra R Mustang has a 27 spline yoke.
Mass Air Sensor
Mass air sensors are devices used to measure air flow into the engine for the vehicles computer. These
started to be used in Mustangs in 1989 and are still being used.
1986-1988 engines measured air pressure in the intake to provide information for the computer. Mass air
sensors send more accurate information to the computer than speed density sensors. A speed density
(’86-88) controlled vehicle can be converted to mass air by changing the computer, adding the sensor, and
running 4 wires (two to the computer, one positive, and one ground). There is a flexible rubber elbow that
connects the mass air meter to the throttle body, which is required for use in a Factory Five kit. When a
1996-2003 Mustang is used as a donor for a Roadster kit, the stock air filter and filter box are required to
complete the kit.
Oxygen Sensors
Oxygen sensors are placed in the exhaust to measure the oxygen content of the exhaust. This
measurement is used by the computer to determine whether fuel delivery to the engine needs to be
increased or decreased. From 1986-1995 Ford Mustangs used two oxygen sensors, one in each side of the
exhaust system. From 1996-2004 Mustangs used four oxygen sensors, two per side. At full throttle the