What are the dimensions of the Small Ford brake flange?

The Small Ford flange has a 2.835" diameter center hole, with bolt hole spacing of 2.000" vertically and 3.336" horizontally.

How does the Big Ford flange differ from the Big Ford New Style flange?

Both have a 3.150" DIA center hole, but the Big Ford measures 2.375" x 3.500" bolt spacing while the New Style measures 2.000" x 3.562".

What are the dimensions of the Ford 8.8" '94-04 brake flange?

It measures 3.410" wide and 1.680" tall at the bolt holes, 3.076" across the lower bolts, with a tubing O.D. of 2.840" DIA.

What bolt circle do the Bronco flange variants use?

The Small Ford-Bronco, Big Ford-Bronco, and Big Ford New Style-Bronco flanges are all noted as 5 x 5.50" bolt circle.

What is the tubing O.D. for the Mustang (05-up) flange?

The Mustang (05-up) flange has a tubing O.D. of 3.190" DIA, with flange dimensions of 3.746" and 2.304".

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Ford Axle Brake Flange Dimensions Diagram - Small/Big Ford, Bronco, 8.8" Types

Dimensioned axle housing flange and bolt-circle drawings for Small Ford, Big Ford and Mustang

Brake Flange Details
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https://www.wilwood.com/brakekits/brakekitaxleflange

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Owner caption February 2024 · Photo 0 of 5000

This blueprint-style reference diagram illustrates ten different Ford rear axle brake flange (axle housing end) patterns with their key dimensions. The top row shows: Small Ford (2.835" center hole DIA, 2.000" bolt spacing height, 3.336" bolt spacing width), Big Ford (3.150" DIA, 2.375", 3.500"), Big Ford New Style (3.150" DIA, 2.000", 3.562"), the 8.8" '94-04 flange (3.410" x 1.680" bolt pattern, 3.076" width, 2.840" tubing O.D.), and the Mustang 05-up flange (3.746" x 2.304", 3.190" tubing O.D.). The bottom row shows Bronco-specific variants with 5 x 5.50" bolt circles: Small Ford-Bronco (I.D. 0.391"), Big Ford-Bronco (I.D. 0.560"), and Big Ford New Style-Bronco (I.D. 0.391"), plus the 8.8" Ford Special (3.150" tubing O.D.) and the 8.8" '04-14 flange (3.76" x 1.65", 2.840" tubing O.D., with 'right bottom / left top' orientation note). Readers can use this document to identify which brake flange pattern their Ford axle has and to match brake backing plates or caliper brackets when performing axle swaps or brake upgrades.

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Frequently asked questions

What are the dimensions of the Small Ford brake flange?: The Small Ford flange has a 2.835" diameter center hole, with bolt hole spacing of 2.000" vertically and 3.336" horizontally.
How does the Big Ford flange differ from the Big Ford New Style flange?: Both have a 3.150" DIA center hole, but the Big Ford measures 2.375" x 3.500" bolt spacing while the New Style measures 2.000" x 3.562".
What are the dimensions of the Ford 8.8" '94-04 brake flange?: It measures 3.410" wide and 1.680" tall at the bolt holes, 3.076" across the lower bolts, with a tubing O.D. of 2.840" DIA.
What bolt circle do the Bronco flange variants use?: The Small Ford-Bronco, Big Ford-Bronco, and Big Ford New Style-Bronco flanges are all noted as 5 x 5.50" bolt circle.
What is the tubing O.D. for the Mustang (05-up) flange?: The Mustang (05-up) flange has a tubing O.D. of 3.190" DIA, with flange dimensions of 3.746" and 2.304".