Pre load for pulling?

Using my very professional drawing as a reference.

The pivot point for rotation, or axle wrap, is where the leaf spring are attached to the axle. Just as a t bar mounted underneath the axle, you are adding a support to stop the rotation.

In a long bar under axle setup the axle rotation is trying to push forward against the t bar. This results in the tbar flexing under heavy load when you traction is present.

In a shorter bar top mount setup the rotational forces are pulling on the tbar. there is absolutely no give in that direction, DOM metal will not stretch.

Both setups do the same thing but, with a top mount there is absolutely no give.
 

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also the mount tabs welded to the top of the axle are angle toward the front of the truck. That way even if you clamped springs give a little it pushes the axle downward, effectively raising your hitch height while pulling.
 
ILLINOISRAM said:
All truck are going to bounce a certain amount even if you dont know its doing it. Look at the promods at schieds, They bounced the carap out of there trucks with solid suspensions. Since there was no suspension to give, the tires were the give point and coming unhooked. The 1inch rule is dumb to me.This just gives room for **** to break. When you leave the line, the sled squats you down and hits the stops but if even for a second the tires loose traction, the rear end will start to lift and then when the tires rehook, it will slam the stops and get worse from there. I think it should either be solid or nothing.
Click to expand...

Exactly. Thats what happened to me at Cumberland. [link in sig] Once it started, it was getting worse & worse. I jumped the clutch out of the hole instead of feathering it out. This caused for the sled to lift because the weight shifted backwards. It did the seesaw effect from there on.
 
hmmm seems like it would put some stress on the springs pushing agains the spring mount....

But then again I'm just guessing by the look of it...
 

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they arent touching the springs, my drawings is crappy, they are mounted running outside the leafs.
 
I understand that but I was implying as the axle wants to wrap around, it will put force in the direction of my red arrow.
 
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