September 26, 2005
As these examples show, the small bearing (left) and large bearing (right) show us the differences in surface area for the bearings that would be installed to support the axles.

Large Bearing/Small Bearing
The 9-inch Ford was available with small or large axle bearings and flanges. From the factory, this meant two different wheel bolt patterns: large and small. Big Fords in the '70s, as well as some trucks, had the large bearing and bolt pattern. this is important to performance in durability. The large bearing housing/flange is simply stronger than the small bearing.

Differential SetUp Quick Points

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9-Inch Housing Applications & Types

Years

Applications

Hub Size

Bolt Circle

Housing End

'57-'63 Early Sm. Bearing 2.43" 41/2" Small Bearing
'64-'73 Sm. Bearing 2.43" 41/2" Small Bearing
'57-'63 Early Lg. Bearing 2.43" 41/2" Large Bearing
'58-'60 Edsel Large Bearing 2.870" 5" Large Bearing
'57-'63 Early Pickup 2.870" 51/2" Large Bearing
'57-'69 Lg. Bearing 2.430"/2.780" 41/2" Large Bearing
'64-'79 Pickup Lg. Bearing 2.870" 51/2" Large Bearing
'79 1/2 Pickup Lg. Bearing 2.870" 51/2" Large Bearing
'72-'79 Torino Lg. Bearing 2.780" 41/2" Torino Lg. Bearing
'79-'86 Late Pickup Lg. Bearing 2.870" 51/2" Torino Lg. Bearing