FORD 9-INCH REAR ENDS

Some of the Information we’ve Gathered

 

How to Recognize Nine Inch Axle Housings

Types of Nine Inch Axles

Width Measurements of Nine Inch Axles    

Width Measurements of Nine Inch Axles (B)

 

The following information was obtained from various sources on the web and from various manuals and magazines. If any of these facts or incorrect or , please send an e-mail to us at: rustynut@rustynutscarclub.com

Note: This information only covers  data from 1957 through 1977. We will add information as we continue to research

 

 

How To Recognize Nine Inch Housing Centers

57 - no dimples, flat center band up the center of the rear cover, bottom drain plug.
58-59 - two dimples on back of housing, flat center band, some had drain holes.
60-67 - two dimples, flat center band, oil level hole in back cover.
63-77 Lincoln, LTD, Thunderbirds had 9-3/8 inch centers, housings were cut away at the gasket surface for ring gear clearance, one curved rib at the front top portion of differential, strong but no gears.

Types Of Nine Inch Axle Shafts - 

28 spline axles cannot be shortened and re-splined (they are tapered).
72 and earlier 31spline axles have the ability to be shortened.
73 and later cars have a 5-on-5 bolt circle and the axles cannot be shortened.

 

 

Types Of Nine Inch Axle Housings

57-68 passenger car and 1/2 ton truck - medium duty, stronger than Mustang type, 28 and 31 spline.
67-73 Mustang/Cougar - light duty, thinnest housing material, small axle bearings, 28 and 31 spline.
69-77 Galaxies (coils), Lincolns (coils), and late pickups (leaf)- 3.25 inch diameter all the way to the backing plate, coil housings have upper control arm mount

Ranchero / Torino – heavy-duty thick wall housing, 3.25 inch diameter axle tubes with flat tops.

 

 

Width Measurements

Note (1) Hub to Hub means Wheel Mounting Surface to Wheel Mounting Surface

Note (2) Rear of Backing Plate to Rear of Backing Plate or Outside of  Flange to outside of Flange

Year

Model

Note(1)

Outside Hub to Hub

Note (2)

 BP to BP or F to F

Bolt

Circle

Notes

65 - 66

Mustang

57.25

52 and 54

 

 

57 - 59

Ranchero / SW

57.25

 

 

66 - 77

Bronco

58.00

 46

5 x 5.5

 

77 - 81

Granada

58.00

 

 

 

64

Falcon

58.00

 

 

 

77 - 81

Lincoln Versaille

58.50

 

 

 

67 - 70

Mustang

59.25

 

 

Identify by wheel flange:
 Oval hole = 28 spline axle  
 Two large holes and counter sunk center = 31 spline axle

67 - 73

Ranchero

59.25

 

 

 

67 - 71

Comet

59.25

 

 

 

67 - 73

Cougar

59.25

 

 

 

67 - 73

Torino

59.25

 

 

 

67 - 71

Fairlane

59.25

 

 

 

67

Cougar

60.00

 

 

 

71 - 73

Mustang

61.25

 

 

Identify by wheel flange:
 Oval hole = 28 spline axle  
 Two large holes and counter sunk center = 31 spline axle

67 - 73

Ranchero

61.25

 

 

 

67 - 73

Torino

61.25

 

 

 

67 - 73

Fairlane

61.25

 

 

 

67

Fairlane

63.50

 

 

Coils on Axle

73 - 86

Ford ¾ Van

65.25

 

 

 

72

Ford ¾ Van

68

 

 

 

WIDTH MEASUREMENTS (B)

 *Measurements are from the mounting face of backing plate to mounting face of backing plate.

Width (inches) *

Make

Model

Year

Note

46

Ford

Bronco

1964 thru 1977

 

50

Ford

T-Bird

1958 thru 1960

 

52

Ford / Edsel

All Full Size

1957 thru 1959

 

Ford

Falcon

1963 thru 1969

 

Ford

Fairlane

1963 thru 1969

See note 1 below

Ford

Mustang

1965 thru 1966

See note 2 below

Mercury

Comet

1963 thru 1965

 

Mercury

Cyclone

1966 thru 1969

 

Mercury

Cougar

1967 thru 1970

 

54

Ford

Fairlane

1963 thru 1969

See note 1 below

Ford

Mustang

1965 thru 1966

See note 2 below

Ford

Mustang

1967 thru 1973

See Note 4 below

Mercury

Cougar

1971 thru 1973

 

56

Ford

All Full Size

1960 thru 1964

 

Ford

T-Bird

1961 thru 1967

 

Ford

Torino

1970 thru 1971

 

Mercury

All Full Size

1960 thru 1964

 

Mercury

Cyclone

1970 thru 1971

 

57

Ford

F-100 Pickup

1958 thru 1972

See note 3 below

58-3/4

Ford

F-100 Pickup

1973 thru 1990

See note 3 below

NOTE 1: The 1963 thru 1965 Fairlane came with a 52’ or 54’ rear end  

NOTE 2: The 1965 thru 1966 Mustang came with a 52’ or 54” rear end

NOTE 3: F-100 pickups came with eight various gear ratios of:

3.25:1

3.40:1

3.70:1

3.90:1

4.10:1

4.30:1

4.56:1

4.67:1

NOTE 4: Identify by wheel flange: Oval hole = 28 spline axle ;  Two large holes and counter sunk center = 31 spline