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Steering Box Codes

Ford Steering Box Codes


Long Shaft Boxes (HCC & HCA Prefix):

Application Tag Code Type Ratio Turns

----------- -------- ---- ----- -----

65-66 Mustang HCC AW Power 16:1 3 3/4

HCC AX Manual 16:1 3 3/4 *

HCC AT Manual 19.9:1 4 5/8

65-66 Comet and Fairlane HCA BZ Power 16:1 3 3/4

HCA CA Manual 22:1 6

65-66 Falcon HCA BY Power 16:1 3 3/4

HCA CA Manual 22:1 6

Short Shaft Boxes (SMA & SMB Prefix):

Application Tag Code Type Ratio Turns

----------- -------- ---- ----- -----

67-68 Montego and Fairlane SMAB Power 16:1 3 3/4

SMAC Manual 22:1 6

67-68 Falcon SMAF Manual 16:1 3 3/4

67 Mustang SMBA Manual 19.9:1 4 5/8

67-68 Mustang SMBB Manual 16:1 3 3/4 *

67 Mustang SMBC Manual 19.9:1 4 5/8

67-70 Mustang and Cougar SMBD Manual 19.9:1 4 5/8

67 Mustang and Cougar SMBE Manual 16:1 3 3/4 *

68 Mustang and Cougar SMBF Manual 16:1 3 3/4 *

69-70 Mustang and Cougar SMBF Manual 16:1 3 3/4

68-70 Mustang and Cougar SMBK Power 16:1 3 3/4

SMBK Manual 16:1 3 3/4 *



- * indicates special high performance applications such as GT, Boss,

Mach 1, etc.

- The steering boxes are identified by a tag attached to one of the

steering box cover bolts. Use the number of turns to verify ratio.

- Early (64-70) Mustang power steering is of the non-integral, add-on assist

type with a separate power cylinder and control valve. There is no

difference between the manual and power steering boxes, except for ratios.

The fast ratio manual steering box is the same as the power steering box.

- 1964-1970 Mustangs have two basic ratios:

1. 19.9:1 ratio, 4 5/8 turns lock-to-lock, used on all low performance

manual steering cars.

2. 16:1 ratio, 3 3/4, used on all cars with power steering and on manual

steering high performance cars (Shelbys, Bosses, GTs, Mach 1s, etc),


- 1964-1970 Mustangs have two shaft styles:

1. 1964 to early 1967 boxes are the long shaft style where the box and

steering shaft form one unit. There is no coupler, the shaft is one

piece from the box to the steering wheel.

2. Late 1967 through 1970 are the short shaft style. There is a couple

between the box and the steering shaft. This change was made to meet

Federal Motor Vehicle Safety Standards (FMVSS) which required a

collapsible steering column. Sector shafts were either 1" or 1 1/8".

There are four different '67-'70 short worms used (2 ratios, 2 sector

shaft diameters).

- The Ford steering box is internally (external housings are not shared)

a GM Saginaw manual steering box. Since the Ford steering boxes use

Saginaw internals, many GM parts interchange and some can provide

performance upgrades.

- 1971-73 Mustangs with power steering use either a Saginaw or Ford

integral power steering box.

- 1971-1973 manual boxes used a differently shaped external casting with

a 1 1/8" sector and 24:1 ratio. There also used a slightly different

frame mounting bolt pattern they won't interchange with 67-70 models.

- The 71-73 worm and rack assembly is identical to the 70-82 Corvette

piece. The Corvette sector (GM P/N 7812838) and worm (GM P/N 7812942)

will fit in 71-73 1 1/8" boxes if a new groove is scribed into the

Ford pitman arm that corresponds with the index on the GM sector and

if a Corvette coupler (GM P/N 7806391) is substituted for the Ford rag

joint. Provides 16:1 ratio rather 24:1 ratio. Also the flat Ford-style

sector shaft cover can be replaced with the 'Vette cover (GM P/N 7806748)

which has an integral bushing that lends additional support to the sector

shaft. The outer rim of the bushing support must be turned down to fit

in the Ford box.

- In addition to using a fast ratio steering box, you can increase the

steering rate by adding a Shelby quick steer kit (longer idler and pitman

arms - What cars did these come from?).

Related Magazine Articles:


1. "Steering Steady", Mustang & Fords, March 1993

The article covers a Global West steering box rebuild. Side articles

explain how a recirculating ball steering box operates and provide

a method for adjusting your steering box preload. Also presented is

a guide to identifying Ford steering box codes.

2. "Steerage Class", Mustang, February 1988

This article also covers a Global West steering box rebuild and

provides a list of steering box part numbers that are still available

(as of June 1987) from Ford. The article also lists some parts

interchanges and upgrades using GM parts.

3. "Pressure Sensitive", Super Ford, September 1993

This article describes a simple way to increase power steering feel

on vehicles equipped with Ford's non-integral power steering. The

approach is to splice an adjustable valve in between the supply and

return lines. Adjusting the valve varies the amount of boost,

increasing steering feel.

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