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Old 10-22-2006, 06:24 PM
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Model "A" rear spring

Greetings to you tonight. I'm looking for factory specs. on a Model A rear spring, mainly stock measurement of the spring itself from eye to eye. I bought a couple used one's a set up my rear suspension according to there widths. Hopefully I hope I didn't make a big mistake in my perch attachment points on the rear axle. The used springs sag enough that the shackels are vertical. Do any of my fellow rodders have the measurements of the stock spring or can you direct me to a web site to find out. Where would be a place that I could purchase a new spring if need be? Thanks for you help!! Scott

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Old 10-23-2006, 07:53 AM
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Quote:
Originally Posted by scott3151
I'm looking for factory specs. on a Model A rear spring, mainly stock measurement of the spring itself from eye to eye.
Here are two scanned images from Bratton's catalog with measurements.

Available from Bratton's, Snyder's, Mac's Antique Auto and others.

NOTE:

The measurements vary slightly depending on the number of leaves.
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Old 10-24-2006, 08:24 AM
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Model A spring

Thanks much for the reply, that helps alot. Have a great day!
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Old 10-24-2006, 10:43 AM
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Model A Rear Springs mount to perches 49.5 inches apart.

The shackles are 2" long. You must spread the spring to meet the shackles on the perches. To make a spring spreader use a piece heavy wall tubing and and a piece of allthread up to 3/4". Hammer the tubing to a closed point at one end and insert the threaded rod with a heavy washer and nut into the tubing. Welded a small length of angle iron on the end of the threaded rod to make your point on that end. Insert the point of the tubing in notch between the spring leaf and spring eye. Tighten the nut on the rod and the spreader will lengthen to meet the other eye then spread as you turn the nut to allow you to install the shackles.
An early Ford suspension must have the springs mounted under tension to work properly. Under load the spring will eventually settle to the "standard" 45 degree angle rather than the horizontal installation position. Depending on what you are building, you may want to remove several leaves from the spring. Keep the main leaf and leaf number 2 and remove alternate odd number leaves. Bring it down to about 5-7 leaves and see how it works out. Add or delete as you try it on the road.
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Old 10-24-2006, 08:25 PM
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Model a rear spring

Thanks for the info, you've sent. Could you also help me with the rear axle spring perch mount measurements on an"A" rear axle. I'm using the spring from an A on my new project and need to know the distance for the perchs center to center. Thanks again for the help. This is a great site to gather needed knowledge!!
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Old 10-24-2006, 08:34 PM
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axle perch mounts

I see that the distance is 49.5" for the rear axle. I missed reading that before I sent out the question. Much appreciated.
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