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Tandem-Axle Trailer Hanger Kit for Double-Eye Springs - 3-1/4" Front/Rear, 5-7/16" Center

Tandem-Axle Trailer Hanger Kit for Double-Eye Springs - 3-1/4" Front/Rear, 5-7/16" Center

Item # APT4
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Trailer Leaf Spring Suspension
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Redline Trailer Leaf Spring Suspension - APT4
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Leaf-spring mounting kit includes 3-1/4" tall front hangers, 5-7/16" tall center hangers, 3-1/4" tall rear hangers and necessary hardware. Equalizers are 6-1/4" long. Components for mounting axle to springs sold separately. Lowest Prices for the best trailer leaf spring suspension from Redline. Tandem-Axle Trailer Hanger Kit for Double-Eye Springs - 3-1/4" Front/Rear, 5-7/16" Center part number APT4 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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  • Reviews (21)
  • Q & A (43)
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Redline Trailer Leaf Spring Suspension - APT4

  • Hangers
  • Suspension Kits
  • Spring Mounting Hardware
  • Double Eye Springs
  • Tandem Axle
  • Redline

Leaf-spring mounting kit includes 3-1/4" tall front hangers, 5-7/16" tall center hangers, 3-1/4" tall rear hangers and necessary hardware. Equalizers are 6-1/4" long. Components for mounting axle to springs sold separately.


Features:

  • Attaches 4 leaf springs (sold separately) to your trailer frame
  • Includes:
    • (4) 3-1/4" Tall front and rear hangers (28-5)
    • (2) 5-7/16" Tall center hangers with 3/4" bolt holes (115919)
    • (2) 6-1/4" Long curved equalizers (TREQ458)
      • 3/4" Diameter center hole for mounting to hanger
      • 9/16" Diameter end holes for attaching to springs
    • (8) 2-5/8" Long shackle straps (115052)
    • (12) 3" Long x 9/16" diameter shackle bolts (9163B)
    • (12) 9/16" Diameter locknuts (916DLN)
    • (2) 3-1/2" Long x 3/4" diameter wet equalizer bolts (126A1LN)
    • (2) 3/4" Diameter castle nuts (165093)
    • (2) 2-1/4" Long cotter pins (165649)
    • (2) 1/8" MPT grease zerks (1610)
  • Designed for use on trailers with tandem, 2,000-lb to 7,000-lb axles
  • Does not include components for mounting axle to springs


APT4 Tandem Axle Hanger Kit - 1.75" Double Eye Springs - 2,000 lbs to 7,000 lbs






Customer Reviews

Tandem-Axle Trailer Hanger Kit for Double-Eye Springs - 3-1/4" Front/Rear, 5-7/16" Center - APT4

Average Customer Rating:  4.6 out of 5 stars   (21 Customer Reviews)

Leaf-spring mounting kit includes 3-1/4" tall front hangers, 5-7/16" tall center hangers, 3-1/4" tall rear hangers and necessary hardware. Equalizers are 6-1/4" long. Components for mounting axle to springs sold separately.

- APT4
by:

881592



- APT4
by:

Impressed with quality of parts. Customer service was awesome in helping me find the right parts. Definitely will do business in future. 804988



- APT4
by:

Good value. Very complete kit of everything you need at a great price. 668782


Comments
Product has been trouble free and held up very well.
Kraig H - 07/12/2020

91741

- APT4
by:

Disappointed with the Made In China for the equalisers though quality seems to be ok. Weld on pressings for the shackles and straps were poorly finished, with sharp edges that needed finishing before assembly/paint prep. Country of origin unknown. 639854



- APT4
by:

Everything I bought looks amazing, I can’t wait to install, all quality looking parts 503107



- APT4
by:

Great products and prices. 478884



- APT4
by:

I have ordered from etrailer many times and they are always prompt with their shipments and the parts arrive as ordered. Customer service A+. 472195



- APT4
by:

awesome, exactly what I needed!!! 451269



- APT4
by:

I was very pleased with the quality of the APT4 kit I received . I had a small issue due to the kit was short 2 bolts and nuts. Etrailer toke care of the issue promptly by sending the missing parts with out question. I would use etrailer for all my future needs. 434469



- APT4
by:

Product was just as advertised. Nice to just order a kit and not have to worry about forgetting something. My only complaint was the packaging as everything was just loose in a cardboard box. Surprisingly nothing fell out in transit considering all the nuts, zerks and cotter pins were rolling around and there was a hole in the side of the box. 423366



- APT4
by:

Excellent product, would purchase again 330689



- APT4
by:

Package arrived on time. All items in great shape. I'm looking forward to doing business with ETrailer in the future. Walker 296837



- APT4
by:

The product came exactly as described, fast shipping, I was very pleased with service! 295285



- APT4
by:

This hanger kit and leaf springs for my tandem boat trailer was PERFECT! I did one side at a time. Once we got the old crap off the trailer, reassembly was a snap. It took about three hours from start to finish. Most of the time was spend removing the frozen center bolt from the old equalizers. I'm very happy I opted for the two center bolts to be "wet bolts". Thanks again, I would definitely recommend etrailer to my friends. Regards, Bob 240822


Comments
Still PERFECT
XRMARTIN-Daytona - 03/16/2017

22858

- APT4
by:

We have bought these hanger kits from etrailer before and are very happy with the product. Their shipping is quick and the value is exceptional. 189467



- APT4
by:

VERY quick shipment and everything is perfect!! What a great company to deal with. 180158



- APT4
by:

The item was a high quality at a great price. Shipping was fast. Communication was excellent. 152772



- APT4
by:

I have ordered from Etrailer a few times now, The service is always great and fast shipping. They have the best prices around. Where I live I have 24 miles of rough dirt road so am always replacing parts on my trailers. Their products hold up to the test of my road. Always a perfect fit too! 145953


Comments
everything is still holding up very good! Thank you guys for the excellent service!
Frank L - 08/17/2015

14312

- APT4
by:

High quality, perfect fit. Can't beat the price. 67968



- APT4
by:

Kit purchased to repalce damaged components on an existing 70's era trailer. The complete hanger kit was cheaper than purchasing the individual parts I needed. The hangers were not used but the equalizers, shackels, and bolts were direct replacements to restore my trailer to tip top shape. I added some nylon spring eye bushings to complete the job! 65122



- APT4
by:

all the parts i orderd came fast and fit perfect. 29687


21
21

Ask the Experts about this Redline Trailer Leaf Spring Suspension

  • Distance Between Hangers with 26 Inch Leaf Springs
    We don't carry the MR4 leaf springs but based on my research they look like they are 26 inch double-eye springs like part # SP-053275. For springs of this length and the Tandem-Axle Trailer Hanger Kit for Double-Eye Springs # APT4 the hangers are going to be spaced 30-1/4 inches apart. I have added a link to a video review of the hanger kit as well as a couple help articles on trailer suspension which I recommend checking out.
    view full answer...
  • Recommended 7-3/4 Inch Suspension Equalizer with 3/4 Inch Center and 9/16 Inch Bottom
    The Tandem-Axle Trailer Hanger Kit for Double Eye Springs - 3-3/4" Tall Front/Center/Rear # APT5 has the wider 7-3/4 inch equalizers you referenced but all holes are 9/16 inches (top and bottom). All of our kits will have the 9/16 inch bolts. This isn't an issue unless you aren't replacing the hangers. We do have the equalizers you are seeking sold individually. They are the Curved Equalizer for 1-3/4" Wide Double-Eye Springs - 7-3/4" Long - 3/4" Center Hole # TREQE34. Then you can...
    view full answer...
  • Recommendations for Lifting Travel Trailer About 3 Inches
    To raise your travel trailer about 3 inches, your best option is to use an over under kit like # K71-384-00 for 2-3/8 inch diameter axle or # K71-385-00 for a 3 inch axle. These kits will convert your axle and suspension so the axle will be under the leaf springs so it will raise your trailer the diameter of your axle plus the height of your leaf spring stack. Another option is the Lippert Components Center Point by Trailair Air-Ride Suspension Upgrade - Tandem Axle # LC1565391 which...
    view full answer...
  • Troubleshooting Rear Tires Wearing on Inside for Dual Axle 5th Wheel Trailer
    Thank you for all of that information. From everything that you described it sounds like you are overloading your rear axle. Even though your axles are rated for 8K each and you only have 12,420 lbs on your axles, if your rear tires are wearing on the inside tread then you have too much weight over the rear axle and you need to adjust cargo around in your 2019 Grand Design 367 BHS Reflection 41. Axles naturally have an arced shape and when they are weighed down correctly they straighten...
    view full answer...
  • Options for Raising Suspension of a Horse Trailer
    The most common way to lift a trailer is to move the axles below the leaf springs. The diameter of your trailer axle will determine the size of the parts that you will need to order. If your axle is 3 inches diameter, the Dexter Trailer Springs Over-Under Conversion Kit, # K71-385-00, would be a great choice and if your axle is 2-3/8 inch diameter you could use the Over-Under Kit, # K71-384-00. These kits can be installed without welding but the manufacturer strongly recommends having...
    view full answer...
  • Can Higher Capacity Leaf Springs be Used on a Trailer Weighed Down by a Bobcat Tractor
    I do not recommend using higher capacity springs because that will give you a stiff ride. Also the different springs may require a different hanger orientation and since the hangers are welded on this is a professional job since the old ones have to be cut off and new ones welded on. Even if you added the higher capacity springs, the axle and tire capacities will not also increase so you could easily overload the trailer. With a load on the trailer, it is going to compress the springs....
    view full answer...
  • Options to Level a Fifth Wheel Trailer that is Being Towed by a Taller Truck
    The easiest solution would be if you could lower the head of your fifth wheel hitch, or raise the pin box of your trailer. Either of these options should allow your trailer to sit more level. You would want to make sure you have between 4-6 inches from the overhang of your trailer to the bedrails though. Another option you have would be to move your axles to below the leaf springs. This is the most common way to lift a fifth wheel trailer to allow the trailer to be towed level if the...
    view full answer...
  • Correct Hanger Spacing for the Tandem-Axle Trailer Hanger Kit Part # APT4
    The position of the axle should dictate the position of the springs and hangers not the other way around. With that being said, in order to determine proper placement of the hangers you will want to take the the distance between the two eye holes on the leaf spring which on part # SP-212275 is 25-1/8". Add that to half of the length of the equalizer from the center of the two lower bolt boles which for the one included in part # APT4 is 3-1/8". You would then need to subtract 1/2" for the...
    view full answer...
  • How to Add a Lift to a Toy Hauler Trailer for Better Ground Clearance
    You can lift your trailer by taking the axles of the trailer and moving them below the leaf springs. Depending on the amount of leaves on your leaf springs this should give you about a 4-6 inch lift. The diameter of your trailer axle will determine the size of the parts that you will need to order. If your axle is 3 inches diameter, the Dexter Trailer Springs Over-Under Conversion Kit, # K71-385-00, would be a great choice and if your axle is 2-3/8 inch diameter you could use the Over-Under...
    view full answer...
  • Replacing Trailer Leaf Spring Hangers
    Thank you for including your diagram, but unfortunately some of the information is not legible. In any case if you are replacing existing parts with different ones you will want to mock up the suspension set-up by first just tack welding the hangers. This will enable you to see if the whole system fits together and if you need to select a new equalizer. The linked diagram provides general axle placement guidelines for new construction. Generally, you want the eye of your spring to...
    view full answer...
  • Hanger Spacing Recommendation for Using Trailer Leaf Springs SP-053275 with Hangers APT4
    When using the trailer suspension hanger kit part # APT4 with a leaf spring that is 26 inches long like the part # SP-053275 you will want to have the hangers spaced 30-1/4 inches apart.
    view full answer...
  • Trailer Suspension Hanger Kit with the Most Lift for Tire Clearance Under the Trailer Bed
    The # APT4 Tandem-Axle Hanger Kit will provide about 4 inches of clearance from the center of the trailer axle to the bottom of the trailer frame, with no load on the axle. This is assuming that your axle tube is 3 inches diameter. If your axle tube is smaller the height will be sightly less. The curve of the springs you select will have some affect also. I would recommend that you go with the APT5 hanger kit because all of the hangers are the same height and it will make it easier to...
    view full answer...
  • Getting More Ground Clearance on a 2012 Lance 1575 Travel Trailer or Other Trailers
    I have a couple of options that will give you more ground clearance depending on how your 2012 Lance travel trailer is set up. First, if the trailer uses double-eye leaf spring suspension AND the axles are on top of the leaf spring stack, AND if you have a 2-3/8 inch diameter round axle, you can use over/under conversion kit # K71-384-00 to move the leaf spring stack to the tops of the axles. For a 3 inch diameter axle use # K71-385-00. If the trailer does not fit the criteria above...
    view full answer...
  • Recommended Hanger Spacing for 24-7/8 Inch Long Leaf Spring with APT4 or APT3HD Hanger Kit
    Based on my research, when using the Universal Group Leaf Springs # SP-222275 that has a spring eye length of 24-7/8 inches with either the Redline Tandem Axle Hanger Kit # APT4 or # APT3HD, you will want a distance of 29-1/2 inches between the hangers on your trailer. Both hanger kits you referenced include everything needed to attach 4 leaf springs to your trailer frame. I have included a couple short video demonstrations on these kits along with an article on positioning a trailer...
    view full answer...
  • Is It Possible to Move Square Axles Below Leaf Springs
    Based on the picture you submitted that shows a square axle welded to a mount which is then welded to a leaf spring you would need to have someone qualified use a cutting torch to remove the mount from the spring so that you could then use a u-bolt style of mounting kit to attach the spring on top of the axle. To do this you will need to know the dimensions of the axle. We have kits for square axles that range from 1-1/2 inch square axles up to 2 inch axles. Once you determine the size...
    view full answer...
  • Raising the Height of a Travel Trailer that Rides Close to the Ground
    If the leaf spring stack on your travel trailer is currently mounted to the bottom of the axle, there is an over-under conversion kit that you could use to gain a few more inches of height. However, this will change the center of gravity on the trailer and can lead to an increased chance of trailer sway. For 3 inch round axles you could use # K71-385-00. And for 2-3/8 inch round axles use # K71-384-00. You should not have to do any welding to use these kits. You would not want to...
    view full answer...
  • How Much Should Wet Bolts be Tightened Down for Hanger Kit # APT4
    When installing the wet bolts, like what comes with the Hanger Kit # APT4 that you referenced, we recommend tightening them down so that the knurls are no longer visible and then backing them off just a little bit. There is no torque rating for wet bolts and you are correct that if you tighten them down too much then it will "lock up" your suspension some. If you follow the procedure highlighted above you will have them tightened correctly.
    view full answer...
  • How to Determine where to Place Axles on a 17 Foot Car Trailer or Any Trailer
    Placement of the axles depends on several factors and there is a formula that you can follow to determine the best placement of the axles. Take a look at the picture I have included which explains how to determine where axles should be placed. Once you have the axle locations determined you can look at what hanger kit will work best for you. I have included a link to the options for you.
    view full answer...
  • Adding Lift To 2003 Jayco Single Axle Tent Trailer
    I spoke with my contact at Jayco about your 2003 single axle trailer. There is no lift kit available but we may have an option for you. If your 1-3/4 inch axle is round and you have underslung leaf springs, I recommend installing a new spring seat on top of the axle, like the Spring Seat for Typical 2000-lb, Round Trailer Axles, part # TRSS175. Simply flipping the axle is not an option because axles are made with a slight arc so that they can handle the load on the trailer. When placed...
    view full answer...
  • Over Under Axle Kit Recommendation to Lift a Trailer
    To raise your trailer up a few inches we do have an option that could work for you. If your leaf springs are mounted under your axle you could get a Dexter Trailer Springs Over-Under Conversion Kit # K71-385-00. This will allow you to move the springs to above the axles and should give you an additional 3-4 inches of lift. You should note that when you raise a trailer that the geometry of the trailer will change. The trailer may become top heavy, which could contribute to trailer sway...
    view full answer...
  • Way To Raise Trailer Suspension When Axles are Under Leaf Springs
    If your axles are currently under the leaf springs then an over-under kit would not be the correct product to use as it would not actually raise your trailer. It would lower it. If you cannot use an over/under conversion kit then the only other way to raise the height of the trailer is to have the old suspension hangers cut off and new, taller ones welded on by a qualified professional welder. I have included a link to the hanger main page for you. You can also try raising the pin...
    view full answer...
  • Raising the Height of a 5th Wheel Trailer with 2-3/8 Inch Diameter Axles for More Ground Clearance
    You likely have 2-3/8 inch diameter axles. 2-3/8 and 2-1/2 are separated by just 1/8 of an inch so if measuring with a tape measure or ruler it could easily look like 2-1/2 inches. If you are measuring with calipers though that is a different story but I've never heard of a 2-1/2 inch diameter axle. If you do think raising the trailer in the back is the way to go then you may be able to use an over/under conversion kit if: The trailer leaf spring stack is currently mounted under the...
    view full answer...
  • Recommended Suspension Components For Double-Eye Springs On Tandem Trailer
    We do not have any kits that have all the components with the dimensions you asked for. You can go a couple ways. You can choose to go with the kit you asked about, part # APT4, and then choose different shackle straps. You will need a quantity of 8 shackle straps. We do not have 3 inch shackle straps available. We do have part # TRSL313, that measures 3-1/8 inches center to center. The overall length is 4-3/8 inches. Or you can order the following components separately (2) 6-1/4...
    view full answer...
  • Can a Trailer with Axles Under Leaf Springs Be Lifted Further
    If you already have your axles mounted below the leaf springs the only way you can add height to a trailer is to go with taller hangers for the suspension. You would need to have the old suspension hangers cut off and new, taller ones welded on by a qualified professional welder. I have included a link to the hanger main page for you.
    view full answer...
  • 5th Wheel Trailer Rides High In the Front When Connected to a 2015 Ram 2500 4x4
    You covered the basic ways of adjusting the height of a 5th wheel trailer (lowering the hitch and raising the pin box). And since the axles are already below the leaf spring stacks there is one other thing that you can do to get more height at the rear. You can have the existing suspension hangers cut off and new, taller ones welded on. We have several heights of hangers available and I have included a link to the hanger main page for double eye leaf springs for you. The cutting and...
    view full answer...
  • How To Raise A Tandem Axle Trailer 3 Inches
    The longest shackle strap we offer is part # TRSL313 which measures 3-1/8" long center to center. In order to replace all of these on a tandem axle trailer you would need eight of them. However, as previously mentioned this will not raise the trailer. If you were to install a longer shackle strap than what the leaf springs and equalizers were designed to be used with it could then create binding issues and potentially cause the leaf springs to make contact with the bottom of the trailer....
    view full answer...
  • Options to Lift a 2003 Keystone Fifth Wheel Trailer
    One option you have would be to move your axles to below the leaf springs. This is the most common way to lift a fifth wheel trailer to allow the trailer to be towed level if the hitch and pin box adjustments are maxed out. The diameter of your trailer axle will determine the size of the parts that you will need to order. If your axle is 3 inches diameter, the Dexter Trailer Springs Over-Under Conversion Kit, # K71-385-00, would be a great choice and if your axle is 2-3/8 inch diameter...
    view full answer...
  • Trailer Lift Recommendation for a Trailer with Axles Over Springs
    Aside from moving the axles below the leaf springs the only other way we recommend you lift a trailer is by installing taller spring hangers on the trailer frame. What you would need to do is measure the dimensions of your current hangers and then compare them to the hangers at the attached link and then go with ones that will give you the amount of lift you need.
    view full answer...
  • Is Welding Required to Install the Tandem-Axle Trailer Hanger Kit # APT4 on a Trailer
    Yes, you will need to have a qualified welder weld on the hangers of the Tandem-Axle Trailer Hanger Kit # APT4 on your trailer.
    view full answer...
  • Lift Kit for Torsion Axle Trailer
    For a torsion axle trailer such as your Lance 1575, there are lift kits available to give you some extra clearance. The Lance 1575 is a single axle trailer so there are two possible lift kits that will work for you, though your torsion axles MUST be side-mounted and not top-mounted and cannot be used with Torflex axles with 3" high profile brackets. The first is part # K71-707-01 which is for #10 Torflex axles with 2,300 to 4,000-lb capacities. The second is part # K71-723-01...
    view full answer...

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Info for this part was:

Expert Research:
Mike L
Expert Research:
Robert G
Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
Adam R
Expert Research:
Jeffrey L
Installed by:
Cole B
Updated by:
Sarah W
Updated by:
Alexander C

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