Step 1:
Choose Rearend
Tip: This calculator only works for cars built for "right-hand traffic."
Tip #2: If you have a Dana or any custom width rearend and want to run original Mopar adjustable tapered ("Set 7") wheel bearings, please call. |
Step 2:
Choose Pinion Offset
Tip: Select "Measure existing housing or axles" to skip the pinion offset and enter the dimensions of your housing directly.
Tip #2: A pinion offset of "0" places the pinion in the exact center of the vehicle. A positive pinion offset moves the pinion toward the passenger side. A negative pinion offset moves the pinion toward the driver side. |
Step 3:
Choose Measurements
Change Brake Gap?
Tip: For "A", "B", "C","D" and "brake gap" measurements, use the schematics below as references.
Tip #2: The Dana is measured from the BACK, so the passenger tube is on the right of drawing. 8 3/4" and 9" housings are measured from the FRONT (brake line clip on the back toward top), so the passenger tube is on the left.
Tip #3: DoctorDiff axles have 2.525" (Dana and 8 3/4") and 2.5" (Ford 9") brake gaps. If your brakes require a different gap, check the box above and enter a custom value. |
Step 5: Click "Calculate"
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Notes:
- If you use an existing housing, position it rightside up (brakeline clip toward top on 8 3/4" and Ford 9" housings) and verify that the A, B, and C dimensions above match what you have. If they do not match, you have either entered something incorrectly, or your combination will not work with your existing housing.
- Verify your brakes will work with the chosen brake gap. If the gap is too narrow, your brakes will not fit.
- To calculate "Drum to Drum" width, add 2 times the thickness of your brake drum to (D) dimension.
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