ConcoursMustang Forums
Restoring - General discussions that span across many different groups of years and models => Drivetrain => Topic started by: Angela on May 23, 2022, 09:19:49 AM
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Based on a collection of old used hardware, I believe Ford used two different length hold-down springs on the rear axle. While I am not sure it matters, it would be neat to understand which shoe (primary or secondary) was supposed to use the longer spring.
When I say "hold down spring", I'm referring to the ~1" long springs which use the cupped washers and retaining pins.
I haven't run across a set of repro hardware with different length springs, hence I doubt it matters much. Regardless, if anyone knows which shoe used the longer spring, I would appreciate knowing this detail. Thank you.
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Different width rear shoes used different length pins and springs. There is a wide and narrow choice. Maybe not your question, but it could be ;)
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I checked into this as well and there are different heights, different colors and some application used a different spring for each of the primary and secondary shoes.
Note that the data I found was in the 60-68 MPC and not field study.
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I did some research into this to identify part numbers and typical spring colours/colors. The primary shoe spring is dual diameter and can be a light or very dark green. The secondary spring is typically yellow. The drum brake adjusting screw is typically a medium blue. The parking brake spring is typically maroon. The shoe retaining springs are a very light blue. These are the only ones I could not find a photo of showing and NOS part.
This is an unrestored Boss 351.
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Primary spring.
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Secondary spring found in a latter service part kit.
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Adjusting screw.
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Parking brake spring.