What is the center bore diameter of a Big Ford axle flange?

The Big Ford flange (both standard and New Style) has a 3.150" diameter center bore. The standard Big Ford has 2.000 and 3.562 bolt-hole spacing dimensions, while the New Style uses 2.000 and 2.780.

What are the Ford 8.8" axle flange dimensions?

The 8.8" Ford flange shows 3.410 and 2.652 bolt spacing dimensions, a 1.680 dimension, and an axle tubing O.D. of 2.840".

How do I tell a 12 Bolt Chevy flange from a late 1993-2002 Camaro 12 bolt?

Both share 3.072 x 2.404 bolt spacing, 2.652 dimension, but the standard 12 Bolt Chevy has a 2.725" tubing O.D. while the 12 Bolt Late 1993-2002 Camaro has a 2.840" tubing O.D.

What flange dimensions do the Mopar 8-3/4, 9-3/4 and Dana 60 share?

The chart shows one common pattern for 8-3/4 and 9-3/4 Mopar / Dana 60 with a 2.875" diameter bore, 3.188 and 1.594 dimensions, and 3.562 bolt spacing.

What is the Small Ford axle flange bore size?

The Small Ford flange has a 2.835" diameter center bore with 2.000 and 3.562 spacing dimensions.

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Rear Axle Housing End Flange Dimensions Chart - Ford 8.8, 9", Chevy 12 Bolt, Dana 60

Axle flange identification chart with dimensioned bolt patterns for Small Ford, Big Ford, Chevy and Mopar axles

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Axle flange identification chart showing dimensioned bolt-circle and bearing patterns for various rear axles plus an axle flange cross-section.

AI caption June 2013 · Photo 984 of 1095

This document is a technical reference chart showing axle housing end / brake flange dimensions for eleven common rear axle types used in domestic vehicles. Each pattern is drawn as a face-on outline of the flange with its center bore and bolt holes, annotated with key measurements in inches. Patterns covered include: Small Ford (2.835 center bore, 3.562 bolt spacing), Big Ford (3.150 bore, 3.562 spacing), Big Ford New Style (3.150 bore, 2.780), 8.8" Ford (3.410 with 2.840 tubing O.D.), Chevy Special (3.072 x 2.404, 3.150 bore), 8-3/4 and 9-3/4 Mopar / Dana 60 (2.875 bore), Olds/Pontiac (3.150 bore, 3.500 x 2.500), Mark Williams (3.150 bore, 2.000), 12 Bolt Chevy (3.072 x 2.404, tubing O.D. 2.725), and 12 Bolt Late 1993-2002 Camaro (tubing O.D. 2.840). A final side-view drawing labeled 'Axle Flange Cross-Section' illustrates how the flange offset is measured. A reader can use this chart to identify an unknown rear axle by measuring its flange bolt pattern, center bore diameter, and axle tube outside diameter, or to select correct brake brackets and aftermarket housing ends when swapping axles or brakes.

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Frequently asked questions

What is the center bore diameter of a Big Ford axle flange?: The Big Ford flange (both standard and New Style) has a 3.150" diameter center bore. The standard Big Ford has 2.000 and 3.562 bolt-hole spacing dimensions, while the New Style uses 2.000 and 2.780.
What are the Ford 8.8" axle flange dimensions?: The 8.8" Ford flange shows 3.410 and 2.652 bolt spacing dimensions, a 1.680 dimension, and an axle tubing O.D. of 2.840".
How do I tell a 12 Bolt Chevy flange from a late 1993-2002 Camaro 12 bolt?: Both share 3.072 x 2.404 bolt spacing, 2.652 dimension, but the standard 12 Bolt Chevy has a 2.725" tubing O.D. while the 12 Bolt Late 1993-2002 Camaro has a 2.840" tubing O.D.
What flange dimensions do the Mopar 8-3/4, 9-3/4 and Dana 60 share?: The chart shows one common pattern for 8-3/4 and 9-3/4 Mopar / Dana 60 with a 2.875" diameter bore, 3.188 and 1.594 dimensions, and 3.562 bolt spacing.
What is the Small Ford axle flange bore size?: The Small Ford flange has a 2.835" diameter center bore with 2.000 and 3.562 spacing dimensions.