Responsible Adult, and why I am not one.

Joined
May 15, 2019
Messages
169
Location
KY
1712440209286.jpeg

On its own weight for the first time in like 5 months. I'm still trying to figure out the shackle hanger placement.

I started with the factory 1335mm horizontal distance from spring hanger to shackle hanger. With the rear wheels off the ground I get this:

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And this with no jackstands:

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So I moved the shackle hangers forward ~6” so the shackles were at 3-4 degrees from vertical with the wheels in the air, but that resulted in this with just the weight of the bare frame on the rear axle:

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I tried splitting the difference with the middle line. It'll still invert the shackle with the wheels in the air, and give me like a 30° or smaller shackle angle with just a couple hundred pounds thrown on the frame (half a sheet of OSB and four very bald and dry rotted 37s on steel wheels). I think with the bed, fuel tank, and anything in the bed the shackles would be just about flat.

Same springs as before, same length shackles.

The spring hangers are at the same fwd-aft position, but are just shy of 2” higher than factory because of the shorter tube section height. Moving the forward spring eye down 2” is doable but will be a shitload of work. Are longer shackles a viable option?
 

Stairgod

Two bad decisions away from buying a bulldozer
Joined
Apr 22, 2019
Messages
2,454
No. Leave the shackles as they are. At full droop have them in line with the leaf spring. And an anti-inversion bar to the shackles and call it good.
As long as they don't slap against the frame at full bump that is.
Just for shits and giggles what is the eye to eye center change on the leaves between full bump and full doop?
And how did you figure shackles length?
 
Joined
May 15, 2019
Messages
169
Location
KY
I'm good with that, haha. Dunno the spring length change but I can try to get that measurement, and I just matched the shackle length for what was on the truck when I bought it.
 

Stairgod

Two bad decisions away from buying a bulldozer
Joined
Apr 22, 2019
Messages
2,454
Knowing the length change makes it easier to figure out the shackle length needed for those particular springs.
 
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