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Axle Flange Bolt Pattern ID Chart - Ford 8.8, 9", 12 Bolt Chevy, Mopar, Dana 60
Reference · 1978-1979 BroncoAll 18 blueprints
Dimensioned drawing comparing axle flange bolt patterns and diameters for several rear-axle types with an axle flange cross section.
Part of 1978-1979 Ford Bronco Blueprints
This document is a blueprint-style reference chart identifying seven common automotive axle flange bolt patterns by their dimensions, plus a side-view cross section illustrating how axle flange 'offset' is measured. Each flange type is drawn with key dimensions in inches: Small Ford (2.835 pilot diameter, 2.00 and 3.375 bolt spacing), Big Ford Old Style (3.150 dia, 2.375, 3.500), Big Ford New Style (3.150 dia, 2.00, 3.562), 8.8" Ford (3.410, 2.840 pilot, 1.680, 3.076), 12 Bolt Chevy (3.125, 2.437, 2.687), 8-3/4 & 9-3/4 Mopar / Dana 60 (3.188, 2.875 dia, 1.594, 2.203, 3.562), and Olds / Pontiac (3.500, 3.150 dia, 2.375, 2.875). A reader can use these measurements to identify an unknown axle or brake flange pattern when selecting brake kits, backing plates, or axles for Ford, Chevy, Mopar, Dana, Olds, and Pontiac rear ends. The 'Axle Flange Cross Section' drawing shows where offset is measured on the axle shaft flange. The document is undated and not vehicle-year specific.
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Frequently asked questions
- What is the pilot hole diameter of the Small Ford axle flange?
- The Small Ford flange has a 2.835" diameter center pilot, with 2.00" and 3.375" bolt hole spacing dimensions.
- How can I tell Big Ford Old Style from Big Ford New Style flanges?
- Both have a 3.150" diameter pilot, but the Old Style measures 2.375" x 3.500" bolt spacing, while the New Style measures 2.00" x 3.562".
- What are the 8.8" Ford axle flange dimensions?
- The 8.8" Ford flange shows 3.410" width, 2.840" pilot, 1.680" vertical spacing, and 3.076" horizontal bolt spacing.
- What flange pattern do 8-3/4 and 9-3/4 Mopar and Dana 60 axles share?
- They share a pattern with 3.188" and 3.562" widths, 2.875" diameter pilot, 1.594" spacing, and a 2.203" diagonal dimension.
- What does the axle flange cross section drawing show?
- It shows a side view of an axle flange illustrating where the 'offset' dimension is measured.
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