How do I identify my rear axle housing end?

Per the chart, take three measurements on the rear end assembly: 1) outside bearing diameter, 2) housing flange dimensions, and 3) stud pattern and bolt circle on the axle flange, then match them to the dimensioned diagrams.

What are the dimensions of the 8.8" Ford housing end flange?

The 8.8" Ford diagram shows a 2.840 diameter bearing bore, a 3.410 flange width, 1.680 stud spacing, and a 3.076 dimension across the pattern.

How do Small Ford and Big Ford housing ends differ?

Small Ford shows a 2.835 bearing diameter with a 2.000 x 3.375 stud pattern; Big Ford shows a 3.150 bearing diameter with a 2.375 x 3.500 pattern; Big Ford (New Style) has 3.150 dia with 2.000 x 3.562.

Can I identify my rear end by appearance alone?

No — the document warns your rear end may differ in appearance from the diagrams and says to rely on the measurements to be certain. Custom rear ends may also use bearings and flange patterns different from original equipment.

What Mopar rear ends are covered on this chart?

Two Mopar patterns are shown: the 8-3/4 and 9-3/4 Mopar / Dana 60 (2.875 dia, 3.562 pattern) and the 8-1/4 and 9-1/4 Mopar (2.530 dia, 3.568 pattern).

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Rear Axle Housing End ID Chart - Ford, Chevy, Mopar, Dana 60 Flange Dimensions

Dimensioned rear axle identification chart with bearing and bolt-circle measurements for various axle flanges

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Dimensioned reference drawing for identifying rear axles by bearing diameter, housing flange, and bolt circle across Ford, Mopar, GM, and others.

AI caption December 2012 · Photo 147 of 199

This is a rear axle housing-end identification chart titled "IDENTIFY YOUR REAR AXLE." It instructs the reader to identify their rear end using three measurements: outside bearing diameter, housing flange dimensions, and the stud pattern/bolt circle on the axle flange. It warns that custom rear ends may use bearings and flange patterns different from original equipment, and that appearance may differ from the diagrams, so measurements should be relied upon. Ten housing-end flange diagrams are shown with dimensioned drawings: Small Ford (2.835 bearing dia, 2.000 x 3.375 pattern), Big Ford (3.150 dia, 2.375 x 3.500), Big Ford New Style (3.150 dia, 2.000 x 3.562), 8.8" Ford (2.840 dia, 1.680 x 3.076, 3.410 width), Chevy Special (3.150 dia, 2.437 x 2.687), 8-3/4 & 9-3/4 Mopar / Dana 60 (2.875 dia, 1.594, 3.562, 2.203), Olds/Pontiac (3.150 dia, 2.375 x 2.875), 8-1/4 & 9-1/4 Mopar (2.530 dia, 1.568 x 3.568), Mark Williams (3.150 dia, 3.000 x 3.000), and 12 Bolt Chevy (2.437 x 2.687). A final drawing shows an axle flange cross-section illustrating where offset is measured. Useful when ordering axles, bearings, or housing ends.

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Frequently asked questions

How do I identify my rear axle housing end?: Per the chart, take three measurements on the rear end assembly: 1) outside bearing diameter, 2) housing flange dimensions, and 3) stud pattern and bolt circle on the axle flange, then match them to the dimensioned diagrams.
What are the dimensions of the 8.8" Ford housing end flange?: The 8.8" Ford diagram shows a 2.840 diameter bearing bore, a 3.410 flange width, 1.680 stud spacing, and a 3.076 dimension across the pattern.
How do Small Ford and Big Ford housing ends differ?: Small Ford shows a 2.835 bearing diameter with a 2.000 x 3.375 stud pattern; Big Ford shows a 3.150 bearing diameter with a 2.375 x 3.500 pattern; Big Ford (New Style) has 3.150 dia with 2.000 x 3.562.
Can I identify my rear end by appearance alone?: No — the document warns your rear end may differ in appearance from the diagrams and says to rely on the measurements to be certain. Custom rear ends may also use bearings and flange patterns different from original equipment.
What Mopar rear ends are covered on this chart?: Two Mopar patterns are shown: the 8-3/4 and 9-3/4 Mopar / Dana 60 (2.875 dia, 3.562 pattern) and the 8-1/4 and 9-1/4 Mopar (2.530 dia, 3.568 pattern).