Tandem-Axle Trailer Hanger Kit for Double Eye Springs - 3-3/4" Tall Front/Center/Rear

Ask the Experts about this etrailer Trailer Leaf Spring Suspension

• Recommended Tandem Axle Hanger Kit For Double Eye Springs
  If you use the 5-Leaf Double-Eye Spring for 6,000-lb Trailer Axles - 25-1/4" Long # SP-111275 which have the same capacity, I recommend the Tandem-Axle Trailer Hanger Kit for Double-Eye Springs - 3-1/4" Front/Rear/Center # APT5 for a tandem axle application. When you follow the attached photo, this will give you the 33-1/2 inch axle spread. For your 6-Leaf Double-Eye Spring for 6,000-lb Trailer Axles - 26" Long # SP-053275, you can use the same system but replace the equalizers with...
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• How to Find the Correct Replacement Equalizer
  The Tandem-Axle Trailer Hanger Kit for Double Eye Springs # APT5 may have the correct equalizer but you will need to measure the current equalizer to find out. The length from the center of the left-most eye to the center of the right-most eye of your equalizer needs to be the same as the 7-3/4 inch measurement in this kit. Since you said the shackles are hitting the frame I recommend using a kit with a center hanger that is longer than the 3-3/4 inch hanger that comes with Kit # APT5....
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• Why do Some Trailer Suspension Kits Have Longer Equalizer Hangers
  The reality is that not every manufacturer makes their suspension kits to the same standard sizes. Some use taller hangers with wider equalizers and some might use a taller equalizer with a shorter center hanger. It really just comes down to the preference of the manufacturer and what gives them the ride height and distance between tires that works the best for them. Also the fact that some trailer leaf springs happen to be longer or shorter plays into what is best solution as well. Ideally...
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• Help Info for Placing Axle Underneath Car Hauler Trailer
  The 60/40 axle placement formula is a great starting point for where to place the axle. That means putting 60 percent of the trailer in front of the axle center and 40 percent behind it. Basically the goal is to have 10 percent of the total weight of the trailer end up as tongue weight as this will allow your trailer to track the best behind your tow vehicle without swaying. I attached a picture and a help article that covers more on this topic for you to check out as well. Sometimes...
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• What Causes Shackle Straps To Flip Below the Equalizer
  It is not uncommon for the shackle straps to flip once weight is lifted off the suspension but if they do so when you have a load bearing then this will not allow for proper load distribution or suspension travel. The cause of this issue is that the leaf springs are too long, the shack straps are too long, or a combination of both. The best option for you to make sure you get the proper spacing would be to change these parts out. If you can let me know the distance between your leaf spring...
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• What is Minimum Distance Require between Tandem Trailer Tires When Considering Increasing Tire Size
  The difference in tire diameter will be an additional 2-1/2 inches going from the 225/75-15 which measure 28.4 to the 235/80-16 which measure 30.9 inches. As a general rule of thumb the minimum safe distance between front and rear tires on the same side of a tandem axle trailer is 4 inches. You would need to measure the distance between your tires currently and subtract 2-1/2 inches. If that dimension then ends up being 4 inches or greater the axle placement could be left alone. Looking...
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• Suspension Hanger Locations for Dual Axle Dump Trailer
  There are some measurements missing that are important in giving you the exact positioning. I've attached a couple articles to assist with the dimensions you must calculate to get your precise 35 inch on center axles. Your center hanger will be obviously directly centered between the two axles and then your other two hangers will be spaced identically on each side. Your spring from the center of the outside hanger to spring seat location is the dimension that would be extremely helpful....
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• Recommended Axle Kit That Will Add 2 to 4 Inches Of Clearance To Your Trailer
  Adding the Tandem-Axle Trailer Hanger Kit for Double-Eye Springs - 3-1/4" Front/Rear/Center, # APT5, will give you a little more clearance, but it won't gain you the 1 inch you are needing with the spring deflection. Another way to lift your trailer would be an over-under conversion kit. This would add way more height to your trailer...probably closer to 4 inches more. This will change the center of gravity on your trailer too, so it is more prone to effects like sway, but will solve...
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• Spacing Measurements for Tandem-Axle Trailer Hanger Kit APT5 & Spring SP-051275
  When setting up a new trailer suspension it is best to do a mock-up (by clamping or tack welding the parts in place) to allow you to see how the system functions. There are so many variables that is best to test. Typical spacing dimensions for 25-1/8-inch springs are shown in the chart on the page for # APT5. Since the springs you intend to use, 4-Leaf Double-Eye Spring # SP-051275, are 7/8-inch longer than those listed in the chart, you will want to increase the hanger spacing approximately...
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• How to Determine Hanger Spacing for Tandem Axle Trailer Suspension with 26 Inch Springs
  Thank you for providing the specs for the suspension components that you already have. Correct hanger spacing really depends on the components being used such as springs, hangers and equalizers. Most of the hanger spacing dimensions that we have are based on our preassembled kits, so we will use that as a foundation for your setup. First, I would either replace all of the front and rear hangers with 2-1/2 inch tall hangers like part # 115918 or replace just the center hangers with 2-1/2...
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• Trailer Suspension Kit and Leaf Springs Recommendation for a Tandem Axle Boat Trailer 4,600 lbs
  As long as you are replacing everything (hangers, springs, hardware, equalizer), then yes, you can use our trailer suspension kit, # APT5. In fact, this is the kit that I recommend for your trailer. The hangers must be welded to the trailer. The holes that you see in the top of the hangers are actually for welding, not bolt holes. For the leaf springs, you will be much happier with the ride quality of part # SP-212275 for 3,500 lb axles. The other springs you referenced are for 5,000...
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• Will Trailer Suspension Hanger Kit # APT5 Fit a Trailer with 2-3/8 Inch Diameter Axle
  You can use the Tandem-Axle Trailer Hanger Kit # APT5 for your trailer with the 2-3/8 inch axle. A 2-3/8 inch diameter axle is typically found on 3,500 pound axles which is within the range of this kit (2,000 to 7,000 pound axles). The measurements in the chart on the page can be used as a guide. A better option for a 2-3/8 inch axle is kit # APT3, # AP233-H248, or # APT1. It all depends on the axle spacing, spring measurements, and equalizer length.
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• Determining Spring Hanger Spacing for Tandem Axle Trailer Fabrication Project
  Thank you for the measurements you provided and for the photo of your trailer suspension mockup showing the spring components' spacing. As long as your shackles do not hit the trailer frame (you mention 1/8-inch clearance) you should be fine, but if you'd like a bit more breathing room you could increase spacing from 29-1/2 to 30-inches without negatively affecting anything else.
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• Tandem Axle Trailer Suspension System Dimensions for Best Function
  The Tandem-Axle Trailer Hanger Kit for Double Eye Springs - 3-3/4" Tall Front/Center/Rear # APT5 does not have different size shackle straps. They are all 2-5/8 inches from center of hole to center of hole. If your current straps are different lengths, there are a couple of things to look at. The leaf springs may be different lengths, the hangers may not be positioned correctly, or the equalizer may be off-centered. Ideally you can the hangers, springs, equalizer and shackle straps...
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• Where to Place the Axle on a 4 Foot Long Trailer
  The correct placement for a trailer axle is going to be dependant on the length of the trailer and total weight when loaded. You are first going to want to pick a spot where you think the axle needs to be which is usually about 3/4 of the way back. You will then use a formula which you can see in the attached help article to make adjustments forward or backward until the correct location is found. Please take a look at the attached help article and then let me know if you need any clarifications...
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• Recommendation For Lifting A Tandem Axle Boat Trailer For More Clearance
  You can use a longer center hanger for the springs, but you will need to add as much height as possible because the spring deflection won't just mean one inch additional hanger length equals one inch of height lifted. Only changing out the center will not give you the additional height of 1 inch you are seeking. My recommendation is that you use a hanger like the Redline Center Hanger for Double-Eye Springs - 5-7/16" Tall - 3/4" Bolt Hole, # 115919, for all your front and rear mounts...
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• Where Place Center Hanger of Tandem Axle when Building Trailer
  You bring up a great question. I attached the picture of the worksheet that you referenced as well. What works best is to first setup the center line for the center hanger so that 60 percent of the length of the trailer is in front of the center hanger and the remaining 40 percent is behind it. That usually gets people the correct placement, but from there you would want to use the worksheet to verify if that is correct.
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• What is Ideal Distance Between Suspension Hangers and Equalizer Bolt Centers
  I'd need to know what the length of your leaf springs are be able to figure out the proper hanger dimensions. What you'll want to do is go with the distance between the hangers that allows the distance between the equalizer side bolt center and the outside hangers to be right near 1/2 inch longer than the distance between the bolt centers of the leaf spring to ensure you get the correct shackle angle.
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• Should Trailer Suspension Equalizers be Level
  If the trailer is not loaded then you will often see equalizers that are tilted like yours. It does not necessarily mean that there is a problem with the suspension. If the springs are worn out then the trailer would easily bottom out. If that is not happening then the springs are likely fine. It is possible that some component is not the right size as well. If the springs are too short or the equalizers are not long enough that can affect the geometry of the suspension.
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• How To Determine Parts Needed To Replace Suspension On Tandem Trailer
  There are a few differences between slipper springs and double-eye leaf springs. Slipper springs normally have a higher weight capacity, and fewer moving parts, but they tend to ride a little rougher than double-eye. You will need to know the length of the springs you are replacing. Over many years of use they can be stretched up to an inch. Also, it is helpful to know the height from the top-center of the spring to the center of the eye and the length from the center of the eye to the...
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• How to Determine Axle Placement for a Tandem Axle Trailer
  To determine the location for the front and rear hangers on your tandem axle trailer you will first need to make sure that you have the correct center point for your equalizer hanger. The center point of your equalizer hanger needs to be located where you will have 60 percent of the frame of the trailer in front of the center of the equalizer hanger and 40 percent behind the center of the equalizer hanger. For example, if the trailers frames length is 18 feet, then the center-line location...
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• What is Axle Spread on Wider Spread Tandem Axle Trailers
  Normally the spread between the wider stance tandem axles is 42 inches. 33 inches is typically seen on the closer stance.
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• How to Determine Axle Position when Building a Trailer
  There is an easy way to determine axle placement on a trailer. Take a look at the picture I have included. Just plug in the numbers and complete the formula to determine the axle placement. The other factor that is going to come into play is the springs that you are going to use. Once you have the measurements all figured out you can determine which springs are going to work with that set up. I have also included a link to our double-eye suspension FAQ article to the right.
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• Should Loctite be Used when Install Trailer Suspension Parts
  I would not use any Loctite when installing suspension components on a trailer since the suspension components need to be able to move relatively freely. I would be afraid of getting the thread locker on bolt or something away from the threads. If you were to use a thread locker then use the blue kind. The red is way too strong. The blue will allow nuts and bolts to be removed with hand tools. Maybe I'm just paranoid but for me, I wouldn't use it.
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• Placement of Suspension When Adding Hangers
  If making a trailer what you need to do is mock up the locations of all suspension components before setting anything because the tongue weight is going to determine the location of your axle, and therefore, your hangers. If you look at the help article I've added on positioning trailer axles there are equations you can use which will help you determine the distances. Without knowing more information such as the hanger kit you are using I would be unable to tell you the locations you...
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• Option for Lifting Trailer Suspension Where Leaf Springs Are Over Axles
  Your best option is the part # LC407131 which will give your tandem axle trailer a 2 inch lift!
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• Do Hangers Need to be Welded to Install
  Yes the hangers from Hanger Kit # APT5 must be welded to your trailer's frame by a qualified welder, preferably one with experience on trailers. As for the load capacity of the trailer, that will depend on the part of the trailer with the lowest capacity; for example if you have a pair of 3,500 lb axles the trailer bed still needs to be rated for 7,000 lbs of cargo. If it is rated for 5,000 lbs that means your trailer's capacity is 5,000 lbs no matter what axles you have. I have added...
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• Determining Center Line of Spindle When Installing Timbren Axle-Less System
  A good way for determining the correct axle placement and spindle centerline when installing a Timbren Axle-Less System like # ASR3500S06 is to attach a plumb bob to each spindle and at the coupler. This will give you a vertical reference line to use when measuring from the coupler and from each spindle, making sure you get that perfect triangle between the 3 components. You can also use a leveling laser the same way. I have attached an installation video that you can use for reference....
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