[Amc-list] 9 in Ford Rear Axle information for potential AMC swaps

["John Elle" <johnelle@xxxxxxxxx>]

Going through information that I have stashed here and there the
following 
FORD  inch Axle information surfaced. Maybe some one can find it 
useful.
 
9" rear axle lengths, Note; Some are not 9"

65-66 Mustang 57.25 inches 
67-70 Mustang 59.25 inches 
71-73 Mustang 61.25 inches 
77-81 Versailles 58.50 inches 
74 Maverick 8" 56.50 inches 
75 Mustang II 8" 57.00 inches 
67-73 Mustang, Torino, Ranchero, Fairlane 9" 59.25 inches to 61.25
inches 
57-59 Ranchero and station wagon rears, 57.25 inches 
66-77 Bronco 9", 58 inches 
77-81 Granada/Versailles, 58 inches 
67-71 Comet, Cougar, Mustang, Fairlane, 59.25 inches 
71-73 Mustang, 61.25 inches 
64 Falcon 58 inches 
67 Cougar 60 inches 
67 Fairlane 63.50 inches (coil springs) 
72 Ford Van 3/4 ton 68 inches 
73-86 65.25 inches 
57-59 Ranchero and station wagon 57.25 iches (narrowest 9" housing) 
66-77 Bronco 58 inches but has 5-on-5 1/2 inch diameter bolt circle 
67-73 Torinos, Rancheros, Fairlanes 59.25 inches or 61.25 inches 
67-71 Comets, Cougars, Fairlanes 59.25 inches 

Where to find the 9" rear axle 

67-73 medium and big block Mustangs and Cougars 
66-71 Fairlanes, Torinos, Montegos, Comets, and other Ford intermediates

with big blocks 
57-59 V8 Fords and Mercurys 
77-81 Lincoln Versailles & Trucks 

Type of 9" axle housings 

67-73 Mustang/Cougar - light duty, thinnest housing material, small axle

bearings, 28 and 31 splines 
57-68 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 
69-77 Galaxies (coils), Lincolns (coils), and late pickups (leaf)- 3.25 
inche dimeter all the way to the backing plate, coil housings have upper

control arm mount 

How to recognize 9" housing centres 

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 9.375 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 

Types of 9" Axles 

28 spline axles cannot be shortened and resplined (they're tapered) 
72 and earlier 31 spline axles have the ability to be shortened 
73 and later 9" (cars) have a 5-on-5 bolt circle and the axles cannot be

shortened 
67-73 Mustang axles identified by wheel flange: 
oval hole - 28 splines 
two large holes and counter sunk center - 31 splines 
 
John. 


 
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