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SAJ-03B Sulastic Shackle for Rear Axle



- Smooths out the ride by just replacing the OEM shackle

- Reduce Vibration and Shocks Not Absorbed by the Leaf-springs

- Stops the Bed Bouncing

- Improve Stability

- Reduce Braking Distance

- Load & Towing Capacity Not Affected

- Improves Handling and Control of the Vehicle

=== Set includes: 2 shackles === 2 Boxes (16"(L) x 13"(W) x 7"(H) / 38 lbs )

To confirm application please provide the following:
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This suspension helps stabilize the load, cushioning any road, whether dirt, stone, asphalt or concrete.The duration of this product is the same as that of the vehicle.If you drive in mountains or on roads that do not have concrete or asphalt, you will have control of the vehicle, the springs will stop breaking on the road and your shock absorbers will last longer, gasoline consumption will decrease because you will have better traction road, braking distance decreases, and sulastic isolates up to 80% of the road impact to the chassis.(What you get as benefits are less loss of product for sale, measuring equipment in good condition, the chassis no longer breaks behind the cabin, better driver driving and passengers with less fatigue).


How many are installed already in the market SAJ-03B?

More than one thousand are in the roads.Our customers use our product to transport and sell milk, bread, cakes, poultry embryos, beer, seeds, furniture, copper saws, gas, engines, transmissions, cranes, machinery, lathe parts, building materials, transportation of personnel to factories, etc. The benefits they found were less broken product, less maintenance on body parts, fewer broken springs, more time their units working and less time in the shop. 



Photos with examples of uses of the trucks;


* Please check the space available in your truck, you need 12” from the hanger bracket bolt to the bumper for the sulastic model SAJ-03B and 11" from the hanger backet bolt to the top of the box or the flat bed. 


On the driver's side it is required to redirect the diesel or gas intake. In this case you can buy the FUEL TANK KIT or the FUEL HOSE KIT.



When you have a commercial vehicle we recommend using the sulastic shackle SAJ-03B since this suspension is adjustable Up to 10,000 pounds, so when you add a box or a flat bed to your Cab Chassis, and all the equipment you will be carrying everything the time according to the work you need (power generators, compressors, welding machines, cranes, etc.). When installed the suspension is calibrated to this weight, the suspension comes with a red hub(picture D), when it falls off when using the tall nut to calibrate, you have calibrated the sulastic shackle to the desired job, after this you no longer need to redo it calibrate. You can see more information when you click on the SAJ-03B installation guide


Picture D 



In the case of commercial vehicles, we do not recommend the SA model since this model is precalibrated to the curb weight of the vehicle. By adding more machinery and structure, the SA suspension will be between ¾ and all of its capacity, you will not feel a change between a OEM shackle and the sulastic shackle. With the SAJ-03B model, being 3 times larger, it controls the weight without problem and the difference in handling is notable.

Notes: The sulastic model SAJ-03B is prepared to be installed with bolts of 5/8¨, but we include the bolts for 18mm if you need to exchange the bushing or the U-shape of the sulastic to 18mm.














This area is intended to show the publications that we have found about our product by third parties, who have evaluated and found benefits in the use of sulastic products. You can click on the photo, and you can see the editor's full post.



8 Lug

Short Description:

Sulastic Installation

Vibration Test

Date Released:

September 2010

Product Reviewed:

SC-07HD - 2005 Dodge 2500

SA-04HD - 2007 Silverado 2500HD

Installed on:

2005 Dodge 2500

2007 Chevrolet Silverado 2500HD

Installed by:


 8-Lug Magazine




Diesel Power

Short Description:

Sulastic Installation

Date Released:

August 2010

Product Reviewed:


Installed on:

1987 Ford F-2506.9L

Installed by:







Inside Track

Short Description:

Sulastic Installation with Aribags

Date Released:


Product Reviewed:


Installed on:

Dodge RAM 3500

Installed by:





Online Reviews


Short Description:

Sulastic Review

Date Released:

Jan 2015

Product Reviewed:


Installed on:

2007 Dodge RAM 2500 4x4


Sulastic Shackles Gen4 – Dodge 2500 / 3500 – (




Online Reviews


Short Description:

Sulastic Review with Airbags and Helper Springs

Date Released:

July 2019

Product Reviewed:


Installed on:

1999 Ford F-250


Powerstrokeonline (Offline)


Q. What type of warranty do you offer?

  1. We issue a limited lifetime warranty against material or labor defects for three years on rubber components, sleeves, and metal washers. And 10 years on the metal, and a 30-day money-back satisfaction guarantee. 


Q. Where can I find the Sulastic Shackles Warranty?

  1. The Sulastic shackles warranty can be found on the last page of the installation guide. (Click Here)

Q. For how long has your product been in the USA market?

  1. Sulastic shackles have been in the market since 2006.

Q. Is a Sulastic Rubber Spring difficult to install?

  1. No, the complete installation process takes between 1-2 hours and only requires a basic set of tools as explained in the installation guides, which you can easily download from this website. We recommend that the installation be performed by a certified mechanic shop.

Q. What could happen to my vehicle if the Sulastic Rubber Spring breaks?

  1. If the rubber fails or detaches from the steel then, the only thing that could happen is that the Sulastic springs will be resting on the working limits and the truck could be unleveled. If this happens remove the Sulastic shackles and reinstall the original shackles.

Q. Do you sell the Sulastic by piece or by the set?

  1. It is sold by set, each set is of two Sulastic shackles which replace the Left and Right stock shackles.

sulastic shackles

Q. Could the truck bed hit the tires if one of the Sulastic Rubber Springs breaks?

  1. No. The vehicle has a limited rubber stop between the axle and the chassis. The rubber stop should prevent contact between the tires and the bed. This situation might be different for trucks that have been modified with lowering kits, larger wheels, etc.

 Q. Is the Sulastic Rubber Springs' performance affected by extreme weather conditions?

  1. No, the Sulastic Rubber Springs has been designed to perform from -60 degrees Fahrenheit up to 180 degrees Fahrenheit, however in extreme weather conditions, the life expectancy is reduced. 



bosque     SNOW 


 Q. When should the Sulastic Rubber Spring be replaced?

  1. When the rubber breaks or when the truck is empty, the Sulastic shackle is completely bottomed (SC-Model) in or stretched (SA-Model) out.

 QWhat type of maintenance is required?

  1. The Sulastic Rubber Springs does not need to be cleaned, lubed, or any other kind of maintenance.

 Q. Can the Sulastic Rubber Springs be rebuilt?

  1. No, it can only be recycled.

Q. Is the Sulastic Rubber Spring affected by frequently riding over muddy or sandy conditions?

  1. No, the Sulastic Rubber Springs are protected by an anti-corrosion coating. You should only rinse them with water once in a while when washing your vehicle.

Q. Can I weld the Sulastic Rubber Spring?

  1. No. The rubber can detach from the metal or get damaged when exposed to temperatures over 250 degrees Fahrenheit.

Q.Can I install my existing Sulastic Rubber Springs on another vehicle?

  1. It is possible, assuming that your new vehicle uses the same Sulastic Part Number. Please use our part locator to verify compatibility.

Q. Will the installation of a Sulastic Rubber Spring void my vehicle's manufacturer warranty?

  1.  No. Manufacturers, distributors, and sales representatives must honor the warranty. However, they are not forced to pay for any damages that might be caused by the Sulastic Rubber Spring.

Q. Does the Sulastic lift or lower my truck when installed?

  1. In some vehicles it can lower or lift the truck by no more than 1/4 an inch at the center of the axle.

Q. Will these affect the load or tow capacity of the truck?

  1. No, the Sulastic won’t affect the load or tow capacity of your truck at all. The product is designed to fit your truck and only helps you with the vibration, balance, and overall driving control.

Q. Does Sulastic offer a long shackle to lower the rear height?

  1. Yes, you can lower your truck by installing a Lowering Kit (KA-01, KA-02, KA-03) in combination with the Sulastic shackle (this combination works only in SA-Models) This combination matches the 3" of extension between the bolts provided by the long shackle or up to 1.5” lower at the axle’s center

Q. What is the expected lifetime of the rubber in the Sulastic shackle?

  1. As an average under normal conditions, the Sulastic lasts about 7-10 years; in severe conditions 3-5 years. However, there have been cases in which they have surpassed 10 years.

Q. Can I paint the Sulastic shackles?

  1. Yes, if it is water-based and does not contain any solvents.

Q. Do you ship internationally?

  1. Yes, if the address and recipient are accepted by the United States Postal Service

Q. Do you offer the service of shipping overnight?

  1. No.

Q. Can I install the Sulastic shackles if my vehicle was modified on the leaf spring suspension components?

  1. Most of the time yes, but Sulastic cannot guarantee the performance of the Sulastic shackles under all modified conditions. Please contact us for further details.

Q. Can I install the Sulastic shackles if my vehicle has installed airbags?

  1. Yes. If the airbags are for the intention to only level the truck and it has kept the same Leaf Spring suspension components.


Q. Can I install the Sulastic shackles if my vehicle was lifted to 2” by using blocks between the leaf spring package and the axle?

  1. Most of the time, yes.


Q. Can I install the Sulastic shackles with other suspension upgrades?

  1. Most of the time they are compatible if the leaf spring suspension is kept.