The Ford Barn

Brian SATX · 08-04-2022, 07:25 AM

Is there a standard for a 10 leaf rear spring as to how tall it should be a the center when out of the car and how far the eyes should be from each other?

rotorwrench · 08-04-2022, 08:48 AM

There were actually three different 10-leaf rear springs made by Ford for the model A depending on application. The A-5560-A was used on the 55A & B Tudor, the 298-A Town Car Deliver, and the 140 Town car. The A-5560-D was used on a lot of the Fordor Sedan models. The A-5560-E was likely the heavier of the bunch and was used under the pickups, the station wagon, and the lighter Panel Delivery models.

Ford likely had a drawing for each one of these. I found a rudimentary spec sheet on them but I can't verify which spec was for which spring. I also don't know how accurate it is. I'll just provide a link to the list.
https://www.hotrodders.com/threads/m...spring.100866/

Eaton-Detroit spring has a look up feature for the model A springs it can produce but they only give the spring rates

Joe K · 08-04-2022, 03:36 PM

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Marco's Spring Chart has had several appearances on the Ford Barn mostly thanks to Tom Wesenberg.

A thread containing "overall" dimension of springs and leaves is shown at https://www.fordbarn.com/forum/showt...t=spring+chart

Note that the chart is not a "bending" diagram - which is what you really need. Still, it may help you determine if your spring is "authentic" Ford - or one of the MANY copies available and sold during the Model A era.

Of three front springs of my ownership, only one is "original." Surprisingly the original is the most "flat" of the three - which is apparent when they are lined up side by each.

Still, vertical rise at the center, or even center-center distance between eyes is not a true indication of "spring K" - the flatter spring MAY be stiffer - or better adapted for use against Model A Shocks.

One expects that somewhere in the Ford Archives are "assembly drawings" showing the various constructions and likely a "target tolerance" for height and eye distance for the various springs front and rear. So far these have not escaped from the Archives.

Joe K

08-04-2022, 07:25 AM	#1
Brian SATX Senior Member Join Date: May 2010 Location: San Antonio, TX Posts: 821	Rear spring dimensions Is there a standard for a 10 leaf rear spring as to how tall it should be a the center when out of the car and how far the eyes should be from each other? __________________ Brian SATX

08-04-2022, 08:48 AM	#2
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,436	Re: Rear spring dimensions There were actually three different 10-leaf rear springs made by Ford for the model A depending on application. The A-5560-A was used on the 55A & B Tudor, the 298-A Town Car Deliver, and the 140 Town car. The A-5560-D was used on a lot of the Fordor Sedan models. The A-5560-E was likely the heavier of the bunch and was used under the pickups, the station wagon, and the lighter Panel Delivery models. Ford likely had a drawing for each one of these. I found a rudimentary spec sheet on them but I can't verify which spec was for which spring. I also don't know how accurate it is. I'll just provide a link to the list. https://www.hotrodders.com/threads/m...spring.100866/ Eaton-Detroit spring has a look up feature for the model A springs it can produce but they only give the spring rates Last edited by rotorwrench; 08-04-2022 at 08:58 AM.

08-04-2022, 03:36 PM	#3
Joe K Senior Member Join Date: Jul 2010 Location: Cow Hampshire Posts: 4,188	Re: Rear spring dimensions Sponsored Links (Register now to hide all advertisements) Marco's Spring Chart has had several appearances on the Ford Barn mostly thanks to Tom Wesenberg. A thread containing "overall" dimension of springs and leaves is shown at https://www.fordbarn.com/forum/showt...t=spring+chart Note that the chart is not a "bending" diagram - which is what you really need. Still, it may help you determine if your spring is "authentic" Ford - or one of the MANY copies available and sold during the Model A era. Of three front springs of my ownership, only one is "original." Surprisingly the original is the most "flat" of the three - which is apparent when they are lined up side by each. Still, vertical rise at the center, or even center-center distance between eyes is not a true indication of "spring K" - the flatter spring MAY be stiffer - or better adapted for use against Model A Shocks. One expects that somewhere in the Ford Archives are "assembly drawings" showing the various constructions and likely a "target tolerance" for height and eye distance for the various springs front and rear. So far these have not escaped from the Archives. Joe K __________________ Shudda kept the horse.