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9" Rear End axel length information and compatibility.
Year & Model |
Axle Length |
Notes |
| 1965-1966
Mustang |
57.25
inches |
|
| 1967-1970
Mustang |
59.25
inches |
|
| 1971-1973
Mustang |
61.25
inches |
|
| 1977-1981
Versailles |
58.50
inches |
|
| 1967-1973
Mustang, Torino, Ranchero, Fairlane |
59.25 inches
to
61.25 inches |
|
| 1957-1959
Ranchero and station wagon |
57.25
inches |
|
| 1966-1977
Bronco |
58
inches |
|
| 1977-1981
Granada/Versailles |
58
inches |
|
| 1967-1971
Comet, Cougar, Mustang, Fairlane |
59.25
inches |
|
| 1971-1973 Mustang |
61.25
inches |
|
| 1964
Falcon |
58
inches |
|
| 1967
Cougar |
60
inches |
|
| 1967
Fairlane |
63.50
inches |
coil
springs |
| 1972 Ford Van
3/4 ton |
68 inches
|
|
| 1973-1986
Ford Van 3/4 ton |
65.25
inches |
|
|
1957-1959 Ranchero and station
wagon |
57.25 inches |
narrowest 9"
housing |
| 1966-1977
Bronco |
58
inches |
5-on-5 1/2
inch diameter bolt circle |
| 1967-1973
Torinos, Rancheros, Fairlanes |
59.25 inches
or
61.25 inches |
|
| 1967-1971
Comets, Cougars, Fairlanes |
59.25
inches |
|
| 1975 Mustang
II 8" |
57.00
inches |
|
| 1974 Maverick
8" |
56.50
inches |
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Where To Find The Nine Inch Rear
Axle
1967-1973 medium and big block
Mustangs and Cougars 1966-1971 Fairlanes, Torinos, Montegos, Comets, and
other Ford intermediates with big blocks.
1957-1959 V8 Fords and
Mercurys
1977-1981 Lincoln Versailles & Trucks
Types Of Nine Inch Axle Housings
1967-1973 Mustang/Cougar - light
duty, thinnest housing material, small axle bearings, 28 and 31
splines.
1957-1968 passenger car and 1/2 ton truck - medium duty,
stronger than Mustang type, 28 and 31 splines.
Ranchero/Torino - heavy
duty thick wall housing, 3.25 inch diameter axle tubes with flat
tops.
1969-1977 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
How To Recognize Nine Inch Housing
Centers
1957 - no dimples, flat center band
up the center of the rear cover, bottom drain plug.
1958-1959 - two
dimples on back of housing, flat center band, some had drain
holes.
1960-1967 - two dimples, flat center band, oil level hole in
back cover.
1963-1977 Lincoln, LTD, Thunderbirds had 9.375 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.
Tip On Shortening Nine Inch
Axles
1972 and earlier 31 spline axles
have the ability to be shortened.
28 spline axles are tapered and
cannot be shortened and re-splined.
1973 and later cars have a 5-on-5
bolt circle and the axles cannot be shortened.
1967-1973 Mustang axles
can be identified by wheel
flange:
Oval hole = 28
splines.
Two large holes and counter-sunk center = 31 splines.
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