Drop Shackles on the rear/maximize articulation

[Rockcrawlintoy]

rears up front with chevies and a single rear shackle.

[mountainyoda]

That is hind of similar to the design that I have.

Awesome design.Have U or anybody used it yet? / Got pics?

[mountainyoda]

rears up front with chevies and a single rear shackle.

Rog!

[bmxicanrivera]

Awesome design.Have U or anybody used it yet? / Got pics?

No, not yet. It is hard to get anything fabbed up without acces to a shop. I mean I built my sliders on the patio of my apartment, but the managers weren't very happy about it.

[mountainyoda]

Almost ready to make up my mind,Ive checked out MC and Pirate web sights for different shackle setups.  From buggy springs to pivoting drop shackles Ive seen many designs.  However stability is also a factor And I want to but dont have to use this rig as a Daily Driver. 

Whats your oppinion on one long ass shackle with the mount set way back? It should make it springy and should give you enough down travel with the safety of no potential pivot breaking points.I haven't seen this kind of setup yet. So what cha think?   

[fordh8r]

Chances are with that steep of an angle the shackle will just let the spring sit on the frame and then.....nothing! 

[mountainyoda]

Chances are with that steep of an angle the shackle will just let the spring sit on the frame and then.....nothing! 

Ya but what if U have really good shocks like 7100 Bilstein Gas Pressurized Shocks ?

[emsvitil]

Measure the length of the spring along the curve so you can find out where the rear bushing would be when the spring is flat.

[fordh8r]

Ya but what if U have really good shocks like 7100 Bilstein Gas Pressurized Shocks ?

If the shocks could hold up the weight of the vehicle you wouldn't need springs. Shocks are only there to dampen or control the spring action. So the answer to your question would be, no.

Measure the length of the spring along the curve so you can find out where the rear bushing would be when the spring is flat.

Then what?

[yota_krawler]

it seems that chevys dont flex like i thought they would, I have stock yota springs in the rear and 44044s up front and I can get 34 inches on a fork lift...

and if you are wondering about my avatar I didnt want to screw up the windshield. I did it with out anyone home 

[emsvitil]

Then what?

I was looking at this pic




With the straightline distance of the spring, measure from the front attachment point to see if the spring can fully flatten with your hypothetical shackle's rear bushing.

[yota_krawler]

there is a flexed shackle pic and a resting shackle pic. There needs to be a tucked shackle pic, I think the hypothetical shackle would probably lay flat against the frame before it would be all the way collapsed. 

[fordh8r]

I think the hypothetical shackle would probably lay flat against the frame.

Exactly! why?  The spring has to change length in order for it to work. The shackle is there to take up the length change in the spring by swinging back and forth.  The spring for the most part is changing length in a fairly linear direction (horizontal in this case). So when you look at the spring in that drawing the spring has the potential to move probably about 2-3 inches rearward (guessing).  The shackle on the other hand when you look at the the center line of the spring bolt and how much more that centerline will move back until the shackle contacts the frame it's probably only like 1/2" -3/4". So basically the shackle will run out of room and quit before the spring will, simply because the shackle is moving mostly upward and not so much rearward like the spring.  I don't know how clear this is but if this makes sense at all then maybe you'll see what I see according to those pics/drawings. 

[mountainyoda]

I was looking at this pic




With the straightline distance of the spring, measure from the front attachment point to see if the spring can fully flatten with your hypothetical shackle's rear bushing.

I understand what U mean.  And your right it is a hypothetical not to scale or measured sketch.  With a shorter shackle the shackle would run out of room before the spring thus contacting the frame.  But with a long shackle, measured and set back mount it might work..

[toybuilt]

If you want to use a long shackle I wouldn't go past the original shackle mount on the frame. It would be plenty long enough and if you put shackle at a 45 degree angle you'd be sitting pretty.

[MiniSimp]

Make a shackle 8.75" long and attach it to the factory shackle mount. Assuming that you have the front 11" forward of the stock mount.
That should give you a 34* angle and won't compress enough to have your spring hit the frame.

[yota_krawler]

^ there problem solved.

[toy4x4ota]

ya go with one shackle, if you set it up correctly it will give you enough flex, here is a picture of mine. one schackle with chebbie springs

[sir flops alot]

Nice flex.. are you running any shocks in the rear?