Originally Posted by mercury75
Which 9 inch fits better under a 1965 Mustang?
1957 Ford Wagon?
1957 Ford Sedan?
1959 Edsel Sedan?
All these will bolt into an early Mustang, since they all have the same 43 inch center-to-center distance on their spring perches, and all are basically 52¼" wide (minus the brake assemblies).
All the '57-'59 Ford passenger big cars will have small axle bearings (just like the early Mustang 8- & 9-inch rear ends). Only the '57-'59 Ford/Mercury station wagons and the Ranchero 9-inch rears had large axle bearings.
The Granada/Monarch/Versailles 9-inch disc brake large bearing rear ends have relatively heavy disc brake components, but they can be changed out for more abundant, modern, SN95 Cobra rear brakes --assuming you have wheels large enough to clear the rotor/calipers: http://www.currieenterprises.com/ces...E.aspx?id=2054
There were also Granada/Monarch 9-inch small bearing rears that came with drum brakes. These also have the narrow width housing and same 43- inch center-to-center perch spread. This is a 9-inch drum brake rear end I got from a 1980 Mercury Monarch (powered by a 250 cu. in. 6-cylinder):
As you can see from the Monarch 9-inch drum brake rear end (just like a Versailles 9-inch disc brake rear end), the housing is much more robust in the area from the center, sloping outward toward the axle tubes, compared to the '60 T-Bird 9-inch housing in this photo :
The old (weaker) WAA, WAB, and WAR 3rd members of the '57-'60 model Ford 9-inch rears isn't much of a problem, since you can easily swap them out for the stronger, more common, C7AW (single vertical rib) 9-inch cases or for the ultimate in strength, an N-case (my two N-cases. Daytona version on right):
Any Ford 9-inch 3rd member with fit any Ford 9-inch housing --you just have to be sure the 3rd member's axle gear spline count matches that of the axle's spline count (either 28 or 31-splines).
This '80 9-inch drum brake rear end (Before) http://img516.imageshack.us/img516/7...anmonarki5.jpg
Now, looks like this with the adaptation of the Cobra rear discs I mounted to with with conversion brackets I fabricated for the changeover: