Author Topic: T100 SAS Boomerang shackles???  (Read 1690 times)

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541mudder

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T100 SAS Boomerang shackles???
« on: Sep 10, 2013, 11:21:44 AM »
Hi,

I am doing an SAS on my 96 T100. I want to get roughly 7" of lift. I bought some custom 5" atlas springs and I was planing on using some longer shackles to lift it the rest of the way. I would like to go with some boomerang shackles to allow for more travel.

I don't know a whole lot on suspension and any suggestions would be appreciated. Thanks

BigMike

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Re: T100 SAS Boomerang shackles???
« Reply #1 on: Sep 10, 2013, 11:26:57 AM »
I would like to go with some boomerang shackles to allow for more travel.
Are you referring to boomerang-shaped shackles or Revolver-type shackles?

Boomerang-shaped shackle. This will help with up-travel but only if you have some sort of shackle interference, such as with a body mount of a Rock Slider mount.


Revolver-type shackle. This will help with down-travel but keep in mind 1) you are not guaranteed more traction and 2) it will buck/clap or more-or-less violently unload during high-traction climbs such as going up a steep granite slab.
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541mudder [OP]

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Re: T100 SAS Boomerang shackles???
« Reply #2 on: Sep 10, 2013, 11:51:52 AM »
Are you referring to boomerang-shaped shackles or Revolver-type shackles?

I am referring to the boomerang shaped shackles. I plan on using my truck as a daily driver as well.

So if I have to interference issues there is no advantage to going with boomerang shackles?
« Last Edit: Sep 10, 2013, 12:02:42 PM by 541mudder »

BigMike

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Re: T100 SAS Boomerang shackles???
« Reply #3 on: Sep 10, 2013, 12:38:12 PM »
So if I have to interference issues there is no advantage to going with boomerang shackles?
Correct. The concept of a boomerang shackle is that as the suspension compresses during up-travel the spring flattens out and pushes the shackle back and upwards. In general the amount of up-travel is determined by a few factors such as if and where you've installed bump stops, how much compression can your shocks handle, and does the shackle interfere with anything.

Shackle interference typically only occurs to the front shackles. If your front springs have any useable amount of positive arc to them, ie all "lift" springs, then the shackle will interfere with something before the spring flattens out or encounters negative arc. The reason why this usually only occurs with front shackles is that most truck frames have a narrow front section and a wide middle and rear section. The frame is narrow in the front to allow room for the tires to turn during cornering without interfering with the frame. In the case of a Toyota frame, the frame transitions from this narrow section to its wide section right in the location of where our front shackles are mounted to the frame. The result is that the shackle is likely to contact the frame (or body mount or rock slider leg) and put the leaf-spring in a bind where its very difficult for any additional up-travel to occur. This is where the boomerang comes in hand: It moves the shackle plate away from objects in an attempt to maximize shackle mobility.

If you need one or not will depend on how your suspension is set up and if you are going to encounter any sort of interference at the front shackles. :twocents:

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541mudder [OP]

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Re: T100 SAS Boomerang shackles???
« Reply #4 on: Sep 10, 2013, 01:03:16 PM »
Thanks, This was really helpful

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Re: T100 SAS Boomerang shackles???
« Reply #5 on: Sep 10, 2013, 08:20:46 PM »
I was planing on using some longer shackles to lift it the rest of the way.
Longer shackles will also change your pinion angle and caster setting.

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541mudder [OP]

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Re: T100 SAS Boomerang shackles???
« Reply #6 on: Sep 11, 2013, 07:04:50 AM »
I need my pinion angle in the rear to change a little to line up with the drive shaft.

 
 
 
 
 

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