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called a hydro-boost system. This system utilized pressurized power steering fluid to assist in pedal
pressure. This unit works with FFR kits with an adaptor bracket which comes standard with FFR 96-04
EFI kits (More brake component information can be found in the High Performance Braking Systems
section of this Manual).
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.
Year
Rear End Width Rear Brake Type
87-93
94-98
99-04
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.
Clutch Cable, Quadrant
Clutch cables and quadrants remain the same from 1982 to 1995. From 1996 to 2002 cables and
quadrants changed.
Speedometer cable
From 1983.5 to 1993 Mustangs used a mechanical speedometer with a cable which had a plastic gear c-
clipped on to its end, which was inserted into the driver side of the transmission. This plastic gear is
designed to translate the proper vehicles speeds that will correspond with the ratio of the gears in the rear
axle. Below is a chart describing which plastic gear is used with the corresponding rear axle gear ratios.
From 1986 to 1993 the mustang still retained a mechanics cable speedometer, and plastic gear on the
transmission end, however an electronic sensor was added on the transmission end to send a signal to the
vehicles computer. From 1994 to 2004 there was only the electronic sensor with plastic gear attached to
the transmission. The speedometer translated the electronic signal to display the vehicles speed. The
1986 to 1995 cable, sensor and gear assembly will fit into the 1996 to 2004 transmissions.
1983-89 3.27:1(19)
1990-98 3.27:1(21)
*
23 Tooth gear may not be completely accurate in the selected application without
changing the transmission drive gear.
59.25"
9" drum
61.125"
10.5" solid disc (GT)
62.52"
10.5" solid disc (GT)
3.55:1(20)
3.73:1(21)
3.55:1(23)
3.73:1(23*)
www.factoryfive.com
11.65" vented disc (Cobra)
4.10:1(23)
4.10:1(23*)
272
508-291-3443
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