Leaf springs

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Jul 13, 2021 | 10:50 AM

hotfalcoon

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Tuned

Joined: Jul 2010

Posts: 330

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From: Reno,NV

Leaf springs

Does anyone know why on trucks with leaf springs front and back, why one set is equal length and the other is unequal length?

Jul 13, 2021 | 11:03 AM

hiball3985

Logistics Pro

Joined: Mar 2005

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From: tujunga, calif

I really have no idea but I have a wild guess. The rear axle has more change when the truck is loaded so having the axle mounted closer to the short end would not create as much pinion angle change..

Jul 13, 2021 | 12:20 PM

hotfalcoon

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Tuned

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From: Reno,NV

I can see your reasoning for that but on 70’s era trucks it’s opposite the equal length are in back and unequal up front.
My thought was maybe to control direction of bounce.

Jul 13, 2021 | 01:11 PM

Aqualand

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Joined: Jul 2021

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From: The Netherlands

For your reference, here is a picture of my 1960 restored springs. The front springs a equal length (the shorter ones) and the rear springs are equal length.

Jul 13, 2021 | 01:50 PM

hotfalcoon

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Tuned

Joined: Jul 2010

Posts: 330

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From: Reno,NV

Thanks for the pic.
I know the springs are equal in length with each other but I’m asking about the length from eye to the tie bolt.
The front springs are equal in length from each eye to the tie bolt but on the rear springs the distance from the front eye to the tie bolt is shorter than the distance from the rear eye to the tie bolt.