Alright, ive searched and searched, and haven't found anything on the interballs about this. I'm sure there is a reason why no one has tried it, but in my mind i feel like it has the potential to work. Here is a 100% mechanically accurate, to scale sketch of what i mean



If you kept the slider sitting all the way back against the stop, the shackle could take up all the movement in regular driving. And in cases where it would need droop the slider could move forward and achieve better flex. Let me know why I'm ignorant for not understanding how this wont work!

 

would this not cause the rear to wander making it crazy to put on the hwy. And it looks like the shackle would slide forward instead of supporting the spring and would just be saggy in the butt until it needed to droop. You could just double shackle. Not that that is much safer. Its just already been done. If the slider was to work it would need to be vertical.

 

It's not free to slide back and forth, is it? The way I interpret it you want to be able to lock it in place anywhere along the "slider". But I could be wrong.

Seems like there's a lot of force involved, and anything like this would have to be very very stout.

 

Well the spring wants to stay in one shape, so i was thinking it would hold its shape (not completely, but to an extent) and keep the shackle pulled back, but i could see how the top of it might slide forward when there is weight on the spring. But as you put pressure on the spring it wants to move out, from eye hole to eye hole. so wouldn't that keep the shackle in place? I dont think the rear would steer that much with regular driving. Even with a regular shackle, the spring still moves front to back during articulation, moving the axle too

 

the shackle is just going to buckle and slam the leaf into the frame. vertical would allow the 2 pivots points of the shackle to work/ force the spring to flex. and would allow your droop when. and only when necessary

 

But they will still unload just as bad as a double shackle.

 

So might as well not try to re invent the wheel. you could always make a long travel independent rear with a subframe. Or just accept that its a leaf spring. Haha.

 

Excuse my ignorance, but whats this unloading of a double shackle you speak of? I've run that setup on my wheeler and was happy with it except for that banging of the second shackle on the frame.

 

I think ill pass on that! would just go links but with the exception of a dedicated wheeler i feel like they are anti-"old school toyota". Ill just go for a good set of leafs, or chevys. Haha thanks for the input fellas!

 

Unloading is the issue of going downhill and the weight of the back end "unloading". at speed, mixed with a hard corner makes for an all over bad time.

 

My father run this on his dirt late model race car years ago and it worked fine. No Ill effects.

 

In my eyes I see to many pivot points to be functional. WAY too much of a chance for the shackle to flip opposite the intended direction leading to a bind and likely damaging the suspension parts. Slider alone or shackle alone is what works. I personally would not try both together. I've seen the double shackle setup some people do with 63" swaps fold up incorrectly and cause problems also. Just my $.02

 

The could do the same thing as the double shackles and weld a plate on the front side of the frame to prevent the shackle from going the wrong way.

But I think this setup up would be only good offroad. I can see it being really boucy driving done the road, since now instead of just the springs flexing when hitting bumps, stopping or hitting the gas the shackle would move up and down in the slider box.