Leaf spring mount distances and shackle lengths...

[YotaAtieToo]

Going by look isn't a bad route with fairly flat springs. The more arch and travel they have the more critical shackle hanger placement is imo.

 

[CDA 455 II]

CDA 455 II I went by look after the initial pic.

Sky's ORD hangers definitely helped via existing bolt/rivet holes.

As a sub-nOOB undertaking the 1ton axle swap/suspension upgrade;
I figured I had 5 holes as options for mounting the leaf springs in order to get the proper shackle angle.

 

[CDA 455 II]

Going by look isn't a bad route with fairly flat springs. The more arch and travel they have the more critical shackle hanger placement is imo.

Those front leaf springs are from my old '99.5 F-350 PS.
They had less than 5,000 miles on them when I upgraded to a 4" lift.

The reason why I used them on my Bronco:
Poor/I already had them.
The center pin moved the axle rearward 5"
I wanted flatter springs.
They're 1ton springs.

 

[YotaAtieToo]

Wasn't hating on, you, I've used many flat springs also, just making a point

 

[CDA 455 II]

Wasn't hating on, you, I've used many flat springs also, just making a point

None taken.

You made said point that I agree with, hence, the spring hangers I got after studying the characteristics between an arched spring pack vs a flat spring pack.

 

[[memphis]]

This front hanger is just hanging by leaf tension from the spring resting on the floor.

I have my rough location marked but due to how I welded my frame main eye hangers… I’m slightly outboard.

I could cheat this on the front and weld the hangers on the front bumper/cross and they will remain supported and I’ll have a better approach angle. I can’t do this on the back due to how the Willys rear body mounts are set up.

Option two, I cut the frame side mounts I tacked on and center the fixed mounts. I wanted them flush on the inside so the mount and the frame overlap could be tied in with one huge fish plate.

Thoughts?

 

[Slander]

Bumping this. Is there a formula to calculate how far back the axle will move on compression for a given arch/shackle length/angle?

 

[Wilson]

Bumping this. Is there a formula to calculate how far back the axle will move on compression for a given arch/shackle length/angle?

Recession is based on the arched length of the fixed end of the spring, not the shackle or angle.

 

[ParadisePWoffrd]

Recession is based on the arched length of the fixed end of the spring, not the shackle or angle.

yup, distance from spring eye to axle at ride height/arch vs spring being flat.

 

[richardskinner]

axle movement itself is relative to the fixed eye and the center pin, not the eye to eye.

A (along leaf surface) - A straight line = how much the center pin will move when the spring is flat.