1. Trailer Leaf Spring Suspension
  2. Universal Group
  3. Leaf Springs
  4. Springs
  5. Slipper Springs - 1-3/4 Inch
  6. 30 Inch Long
3-Leaf Slipper Spring w/ Flat End for 2,900-lb Trailer Axles - 30" Long

3-Leaf Slipper Spring w/ Flat End for 2,900-lb Trailer Axles - 30" Long

Item # SP-039275
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Our Price: $41.99
Trailer Leaf Spring Suspension
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SP-039275 - Leaf Springs Universal Group Springs
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Slipper leaf spring acts as part of a trailer's suspension system by providing an attachment point for a 2,900-lb axle. Spring flexes to resist shock and also ensures a smooth ride. Includes bushing with 9/16" inner diameter. Lowest Prices for the best trailer leaf spring suspension from Universal Group. 3-Leaf Slipper Spring w/ Flat End for 2,900-lb Trailer Axles - 30" Long part number SP-039275 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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  • Reviews (114)
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Universal Group Trailer Leaf Spring Suspension - SP-039275

  • Leaf Springs
  • Springs
  • Slipper Springs - 1-3/4 Inch
  • 30 Inch Long
  • 2900 lbs
  • Universal Group

Slipper leaf spring acts as part of a trailer's suspension system by providing an attachment point for a 2,900-lb axle. Spring flexes to resist shock and also ensures a smooth ride. Includes bushing with 9/16" inner diameter.


Features:

  • Leaf spring acts as part of your trailer's suspension system
    • Provides attachment point for your trailer's axle
  • Multiple leaves allow flexibility to absorb road shock
    • Allows for a smooth ride
    • Reduces wear and tear on trailer
    • Ensures level ride on bumpy and uneven surfaces
  • Sturdy steel construction
  • Nylon bushing included
  • Pre-mounted hangers or aftermarket hanger kit (sold separately) required for installation
    • Eye of spring attaches to hanger mounted on trailer frame
    • Slipper end slides into hanger or equalizer


Specs:

  • Quantity: 1 leaf spring
  • Spring capacity: 1,450 lbs
  • Axle capacity: 2,900 lbs
  • Length from center of spring eye to end of spring: 30"
  • Spring width: 1-3/4"
  • Eye diameter with bushing: 9/16"
    • Eye diameter without bushing: 7/8"
  • Leaf thickness: 3/8"
  • Number of leaves: 3
  • Additional dimensions: see table


Flat End Slipper Spring

Part NumberABCDE
SP-03927513-5/16"30"15"17-3/4"4-7/8"


Note: To ensure proper axle alignment and suspension performance, leaf springs should always be replaced in pairs.


Leaf springs are an integral part of your trailer suspension system. The leaf springs provide the attachment points for your trailer's axle, suspending it from the frame of your trailer. Each spring flexes to absorb road shock as you travel, allowing the axle to move somewhat independently of the rest of your trailer. This helps to reduce wear and tear on the trailer and also ensures a smooth ride.


Slipper leaf springs attach to hangers that are welded onto your trailer. The eye of this spring will attach to the front hanger with a suspension bolt. The flat slipper end of the spring will slide into the rear hanger. If you have a tandem- or triple-axle trailer, the slipper end will slide into the equalizer that connects multiple springs. The shape of the slipper end of a leaf spring may vary slightly due to differences among trailer manufacturers. Because of this, it's important to check your leaf spring's slipper end before purchasing a replacement spring.


To mount this spring, you will need hangers, a suspension bolt, and possibly a spring keeper bolt, depending on the design of the rear hanger. If you are simply replacing a spring, you may still have hangers welded onto your trailer, but it would be wise to replace the bolts as they can experience wear. It is also recommended that you replace the other leaf spring in your setup at the same time. Because springs can sag and elongate as they wear, this new spring may not exactly match the old one, and the alignment of your trailer could be affected.


If you are fabricating a trailer, you will need to purchase a hanger kit for installation. To determine the type of hanger kit that you need, you must know the specific type of leaf spring that you have, as well as your axle capacity. Depending on the hanger kits used with them, springs can be configured to work for single-, tandem- or triple-axle applications. Hangers and other suspension components can also be purchased separately if there isn't a complete kit that works for your setup.



UNA-039 Universal Group Slipper Trailer Leaf Spring - 3 Leaf - 1,450-lb Capacity

Replaces WIF3






Customer Reviews

3-Leaf Slipper Spring w/ Flat End for 2,900-lb Trailer Axles - 30" Long - SP-039275

Average Customer Rating:  4.9 out of 5 stars   (114 Customer Reviews)

Slipper leaf spring acts as part of a trailer's suspension system by providing an attachment point for a 2,900-lb axle. Spring flexes to resist shock and also ensures a smooth ride. Includes bushing with 9/16" inner diameter.

- SP-039275
by:

Service was excellent. Ordered leaf springs on Monday and they were delivered two days later. My shipping was upgraded at no additional cost to me. I haven't installed the springs yet but they look great and they should fill my needs. I will order from you for any future needs. 424942



- SP-039275
by:

Springs fit great. Very pleased 488288



- SP-039275
by:

Great Experience! When I noticed that the leaf springs on my 44 year old boat trailer had cracked I thought I would never find replacements. I fully expected to have to have something custom built. I was amazed when I found the fantastic diagrams/descriptions dimensions for replacement springs on etrailer.com The phone support person was wonderfully helpful in confirming if items were in stock and ready to ship. The replacement springs arrived on time and everything bolted up perfectly! Thanks for such a great site! 84053



- SP-039275
by:

It was exactly what I needed service was quick and easy 902379



- SP-039275
by:

Simple online ordering with timely deli very. 900047



- SP-039275
by: 08/07/2020

THese spring are getting rust already. The old ones lasted 20 years. The new ones are not the same. 857708



- SP-039275
by:

Perfect fit, nice heavy gauge steel that's easy weld. 837881



- SP-039275
by:

Spring was good, fit as expected. I wish the paint finish was a little more durable but we're talking about a trailer leaf spring here, that's just the way they are. I had to flip the center pin for my application which was easy enough. The most disappointing thing is the way these were packed, like everything else I have ever ordered from etrailer they were literally just thrown in a giant box with a single sheet of packing paper. The box was of course destroyed by the heavy springs bouncing around in the box. You can tell that at some point at least one spring fell out of the box and the shipping company had to put it back in. 807361



- SP-039275
by:

Great replacement for my busted spring. The shipping was very fast and communication was excellent. I highly recommend. Thanks, Aaron 797079



- SP-039275
by:

Axle and all parts still holding up! 794814



- SP-039275
by:

Thank you so much looks like it'll work just fine have not had the opportunity to bolt it on yet came in today and also the leaf spring looks like it'll fit exactly where the one I broke is LOL thank you so much for your rapid response in filling my order and free shipping did not hurt my feelings at all thank you have a nice day note to Rose thank you also 771319



- SP-039275
by:

Great experience. After my order was placed, I was notified it would be arriving sooner than expected. It did just that. Good looking leaf springs, even though I haven't installed them yet, they look pretty good. They weren't damaged in any way and they measured exactly what was specified. Highly recommended website for trailer parts 765345



- SP-039275
by:

Un flippin believable. The service was tops...it might have been the best service department I have ever dealt with. Super fast shipping and quality parts. There is no other place to go for your trailer parts. 759106



- SP-039275
by:

good parts, good price 747488



- SP-039275
by:

These springs were perfect for replacing the old worn out springs. It was a very easy swap to do. The trailer now tows very well. 746761



- SP-039275
by:

I couldn't believe they have been delivered already. Thank you! 733383



- SP-039275
by:

The lady I talked to on the phone was super helpful and very polite pleasure to deal with and great product. 721877



- SP-039275
by:

Great description on website of product. Fair pricing. Quick shipped to my address. Perfect fit for my boat trailer. Always a pleasure dealing with Etrailer! 718387



- SP-039275
by:

Fit was perfect. Shipping was fast and price was very reasonable. Happy customer here 694319



- SP-039275
by:

The springs and accessories that I bought are performing great. I'm very happy with the products and services. 674408



- SP-039275
by:

Fit perfect 672740



- SP-039275
by:

Good quality and superb fit. New springs went on in 20 minutes. We are [were] planning a trip so the quick and inexpensive shipping was great. Should the occation occur I will be a repeat customer. Thanks! Ted S 672267



- SP-039275
by:

Thanks for the prompt delivery and courteous service. The trailer springs I ordered were the exact parts I needed and fit well. I will complete the installation Tuesday afternoon and sent a photograph. 670756



- SP-039275
by:

great quality 640733



- SP-039275
by:

Very good I got what I need on time, price lower that other store. 638173


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Show More Reviews

Ask the Experts about this Universal Group Trailer Leaf Spring Suspension

  • Replacement Slipper Style Leaf Spring for 1984 Tee Nee Trailer
    For your 1984 Tee Nee trailer, the number of leaf springs is not the determining factor but rather the length and the capacity rating. The 3-Leaf Slipper Spring w/ Flat End for 2,900-lb Trailer Axles - 30" Long # SP-039275 is a great replacement option based on your photo as long as your axle capacity is 2900 lbs because each spring is rated for 1450 lbs. If you have a 3,500 lb axle then instead you would want # SP-040275 because it is a higher weight rated spring. If the trailer...
    view full answer...
  • Need a 3-Leaf Slipper Spring Kit for my Boat Trailer with 2 Inch Square Axles
    In order to determine which 3-leaf slipper springs will fit, you will need to take a few measurements of the current springs on your boat trailer. I am including a diagram that shows which measurements are needed. The diagram also includes the measurements of the two 3-leaf springs that we have available. Compare your measurements to those to see if we have a match. 3-Leaf Slipper Springs for 1,500 lb Trailer Axles, # SP-178275 3-Leaf Slipper Springs for 3,000 lb Trailer Axles, # SP-039275 Although...
    view full answer...
  • Replacement Slipper Leaf Spring Recommendation for 1987 Shoreline Boat Trailer
    The best option we have is the part # SP039275 that you referenced. It's going to be a little longer and a little stiffer than you need most likely since it's for a 2,900 lb axle, but it will work and get the job done.
    view full answer...
  • How Much of a Slipper Spring Should be Sticking Out Past the Rear Hanger
    The flat end of a slipper spring should stick far enough through a hanger to allow for the full travel of the suspension without the spring coming out of the hanger. When you have no load on the spring and especially if the frame is currently upside down then the end of the spring will likely be very close to the hanger. Once it is right side up the spring will compress some and push more of the flat end through the hanger. With spring # SP-039275 the hanger spacing should be 28 inches...
    view full answer...
  • Replacement Slipper Springs 30 Inches From Center Of Spring Eye To End Of Spring
    We have the replacement slipper springs you are looking for. They are the 3-Leaf Slipper Spring w/ Flat End for 2,900-lb Trailer Axles - 30" Long, # SP-039275. These have a spring capacity of 1,450 lbs and an axle capacity 2900 lbs.
    view full answer...
  • Selecting Replacement Slipper Springs
    The linked page will display all slipper type leaf springs we offer. You will want to confirm your axle weight capacity as well as the spring width and length as you select replacements. You will also want to replace both springs on each axle to ensure the trailer tracks properly. We offer several slipper springs in a 30-1/2-inch length including the 5-leaf spring # SP-252275 for 10K axles and the 7-leaf # SP-270275 for 15K axles. You may care to refer to the linked article on trailer...
    view full answer...
  • How to Find a Replacement Leaf Spring for a Travel Trailer Labeled EMCO-ABO-72-06
    We probably have something that would work but I can't find any information on the part number you listed. I doubt somewhat that the number you listed is even a part number. If you can give me the dimensions of the spring, it's style (double eye/slipper), and it's capacity I can find you a replacement. Or you can check out the link I attached that has all of the springs we carry. If you use the filters on the page you can narrow down your results to match what you are looking for. Keep...
    view full answer...
  • Trailer Leaf Spring Recommendations for a Boat Trailer with 1,900 Pound Boat
    The leaf springs should be rated to match the axle on the trailer. Spring # SP-256275 is rated for 2,250 pounds per spring so it fits 4,500 pound axles. These springs would be overkill for a boat weighing up to 1,900 pounds and it would be a very stiff and jarring ride for your boat. Your trailer axle may have a capacity listed on it somewhere and if not then there should be some capacity information on a placard or sticker near the front of the trailer somewhere. Whatever the gross...
    view full answer...
  • Replacement Trailer Leaf Springs for Toy Hauler with GVW of 18,000 lbs
    For a set of 3,000 lb leaf springs that would fit your trailer you would want the part # SP-115275. These are 25-1/4 inches from eye center to center which should work well as a replacement for your 26 inch long ones. Springs tend to flatten out over time which causes their overall length to increase slightly. I attached a review video for you to check out as well.
    view full answer...
  • Recommended 30 Inch Slipper Springs and 2 Inch Square Axle Mounting Kit
    For your 2,000 lb square axle, I recommend the 3-Leaf Slipper Spring w/ Flat End for 2,900-lb Trailer Axles - 30" Long # SP-039275 which is a little stronger than your axle but won't increase your capacity of 2,000 lbs. This is a 30 inch long slipper spring with a 1.75 inch width as you stated. I recommend using the Spring-Eye Bolt with Locknut for Slipper Springs - 3-1/2" Long # 166079 with each spring. For your square axle mounting, I recommend the CE Smith U-Bolt Kit for Mounting...
    view full answer...
  • Is Leaf Spring Capacity Rating for One Side or Two
    The weight rating on the # SP-039275 spring would be 1500lbs per side, with a rating of 3000lbs for both sides. I have included some more information on installing slipper springs, if needed.
    view full answer...
  • Are Redline 3-Leaf Slipper Springs For 3,000 lb Trailer Axles Sold in Pairs or Individually
    The 3-Leaf Slipper Spring # SP-039275 that you referenced is sold individually. Current pricing is on the product page attached.
    view full answer...
  • How to Pick Out 10,000 lb Axle Leaf Springs for Trailer
    To pick out the correct length leaf spring requires you to measure the length of the spring from eye center to eye center without any weight on the trailer. Since you most likely have slipper springs since your axles are 10,000 lb you'd need to measure from eye center to the bend on the opposite end where the spring would fit in the hanger. Keep in mind that old springs will stretch a bit over time. I attached a link to a page that has all of the 10,000 lb axle leaf springs we offer...
    view full answer...
  • 1-3/4 Inch Slipper Spring That is 30 Inches Long and Over 2,500 lb Capacity
    We have a couple of slipper springs that may work for you, as they are 1-3/4 inches wide, measure a total of 30 inches, and have the capacity you need. Springs do elongate over time, but you may have to have your brackets re-positioned if the 30 inch length isn't enough (this is the longest available for 1-3/4 inch or 2 inch springs). You will want to get a spring that is as close to your axle capacity as possible without going under it's capacity. - 2,900 lb Axle: 3-Leaf Slipper Spring...
    view full answer...
  • Recommendation For Replacing Leaf Springs And Hangers
    I am glad to make a recommendation for your needs based on the pictures and information you sent. We have a few options to consider for a 30 inch long leaf spring that is 1-3/4 inches wide. For an 1,800 lb axle that has 2-Leaf Slipper Spring with flat end option, you would use Item # SP-038275. For a 2,900 lb axle that has 3-Leaf Slipper Spring with flat end option, you would use Item # SP-039275. A U-Bolt Kit for a 1-1/2 inch wide square axle for 1-3/4 inch springs is Item #...
    view full answer...
  • Replacement Slipper Springs for 1985 Harding Boat Trailer
    I do have options for you but exact replacements for old boat trailers are hard to come by. In the majority of cases, items will need to be altered for an exact fit which I assume is what is going to need to be done on your trailer as well. We don't have a slipper spring that is 1-3/4" wide x 28" long (center of eye to end of spring) with a 2,500, 3,000, or 3,500 lb capacity. However, leaf springs will fatten out over time which means the leaf spring that was originally installed on the...
    view full answer...
  • Will Slipper Springs be Installed Above or Below New Dexter Axle
    If you are installing the Dexter Idler Trailer Axle w/ Hubs # 20545I-EZ-60-10 with the U-Bolt Kit # APUBR-10 on your Harbor Freight trailer you will install the slipper springs, either # SP-039275 or # SP-179275, below the axle like in the linked installation video. This axle will work as a replacement, though I do recommend verifying your current axle has the same 48" spring-center-to-spring-center length and 60" hub-face-to-hub-face length.
    view full answer...
  • Replacement Slipper Springs to Replace 32 Inch Long Springs
    The 30 inch slipper springs we carry don't have a measured radius but the 28 inches you're looking for will work just fine. Your 32 inch springs were likely a little shorter than that originally and have flattened over time. Although probably not the full 2 inch difference but enough that our 30 inch springs will work on your trailer. We carry three different weight capacities that are 30 inches: 4-Leaf for 3,700 pound axles # SP-040275 3-Leaf for 2,900 pound axles # SP-039275 2-Leaf...
    view full answer...
  • Recommended Torque Specifications for U-Bolt # SP01-160 in a Slipper Springs Trailer Setup
    Since the # SP01-160 u-bolts are 9/16 inches in diameter the torque rating is from 65 ft/lbs - 95 ft/lbs. I have linked a Help Article on Slipper Spring Trailer Suspension System Review to this page that lines out the torque ratings of the different diameter u-bolts for you to check out. I linked all the parts you mentioned to this page for your purchasing convenience.
    view full answer...
  • 30 inch Long Slipper Spring Recommendation for Boat Trailer
    We have a few options for 30 inch long slipper spring that is 1-3/4 inches wide. For a 3,700 lb axle option we have the part # SP-040275. For a 2,900 lb axle option we have the part # SP-039275. For an 1,800 lb axle you would want the part # SP-038275.
    view full answer...
  • Replacement Leaf Springs and U-Bolts for a 1987 Shore Line Boat Trailer
    Thank you for submitting the photo of your setup. Considering the height of your axle and the amount of clearance you currently have from the axle to the frame of your trailer you wouldn't have enough room to put your axle above the leaf spring. You would barely have a couple of inches of suspension travel. For U-bolts you would want the part # SP01-160 and then for plates you would want the # 117594. Based on the dimensions of your current slipper springs the # SP-040275 that you...
    view full answer...
  • Recommended Axle and Leaf Springs for a Harbor Freight 4x8 Foot Folding Trailer Model 90154
    I recommend # 20545I-EZ-60-10 Dexter Idler Trailer Axle w/ Hubs - EZ-Lube - 5 on 4-1/2 Bolt Pattern - 60" Long - 2,200 lbs. I like this axle because of the EZ-Lube simple lubrication. You will also want to pick up a U-Bolt Kit # APUBR-10 for mounting your axle. Please check out the attached installation video for additional info. I was able to track down the specs for your trailer on-line and found that it uses slipper springs, so you'll want to go with one of the following. Choose...
    view full answer...
  • Recommended Slipper Springs for a 2011 Triton LTWC11 2,500 Pound Jet Ski Trailer
    To determine the correct slipper spring for your 2011 Triton jet ski trailer, you will need to know the width of the spring, the length of the spring, and the weight rating of the axle on your trailer. Based on your measurements you provided about your 2011 Triton LTWC11 2,500 pound jet ski trailer, I think your best option would be slipper springs by Redline # SP-039275. This leaf slipper spring is 30-1/4 inches long and 1-3/4 inches wide. It's designed to work on trailers with 3,000...
    view full answer...
  • Recommended Trailer Suspension Enhancement To Keep From Bottoming Out
    Just based on the information given on capacity, length, and style, we don't have the spring you need. The closest we have are the 3-Leaf Slipper Spring w/ Flat End for 2,900-lb Trailer Axles - 30" Long # SP-039275 which will not fit your hangers. You may want to consider using the Timbren Trailer Suspension Enhancement System Light-Duty Trailers 1,000 lbs # TTRA1702 to keep your trailer from bottoming out. This is an assist if you have working/functional suspension. The best option...
    view full answer...
  • Replacement Slipper Springs for a 2,100 lb Trailer
    The most important factor in picking out a new leaf spring for a trailer is to match the capacity needed. Going with a 3,500 lb spring for a 2,100 lb trailer is going to give you a very harsh ride. For a spring similar to the # WIG4 that is better rated for your trailer we have the # SP-039275 which is for a 3,000 lb axle or part # SP-038275 for a 2,000 lb axle. If you need all 2,100 lbs of your trailer's capacity you would have to go with the # SP-039275. If you have a 2 inch square...
    view full answer...
  • How to Determine Load Capacity of Trailer Suspension
    We do not recommend that you exceed your trailer's carrying capacity. You will be limited to your axle's rating. The 3-leaf slipper springs, # SP-039275, that we offer measure 24-1/4" long x 1-3/4" wide. These springs are designed for use on trailers with 1,500-lb axles. If your axles are only rated for 1,500 lbs you would be limited to that. I have included a link to our 2000 lbs axles and a FAQ article on trailer suspension systems for you to check out.
    view full answer...
  • Will Slipper Spring Work With Dexter Trailer Axle w/ Idler Hubs
    You sure can use slipper springs with the Dexter Trailer Axle, part # 20440I-EZ-72. The only concern is your hangers you have on your trailer. You may find that the slipper spring is a bit longer and a hanger will need to be moved. The slipper spring I recommend is part # SP-039275. This is a 3-leaf spring that measures 30 inches long and 1-3/4 inches wide. It is designed to be used for 2,900 lb trailers axles so it may be just a bit stiffer ride. I have attached a link to a product...
    view full answer...
  • Slipper Spring for Older Boat Trailer that is 30 inches in Length
    We have a few slipper springs that are 30 inches from spring eye to hook, but you did say eye to eye which would imply a double eye spring. Since 30 inch double eye springs are very uncommon I'll assume you do have a slipper. So for a 1,800 lb capacity spring you'd want the part # SP-038275 or for a 2,900 lb spring you'd want the # SP-039275.
    view full answer...
  • Do you have a spring that is 24 center to center and a reverse curve and closed eye?
    We do not have a spring that fits that specifically. In our 3 leaf springs we have two that are closed eye on one end and reverse curve on the other. The # SP-039275 measures 30" center to end of spring and the # SP-178275 measures 22-3/4" center to center. If you are able to go up to the 4 leaf spring we have # SP-231275 which measures 24-5/8" center to center. If you want to go the 4 spring route the added capacity of the 4 leaf would bring you up to 2,500 lbs per spring which will...
    view full answer...

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Info for this part was:

Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
Adam R
Installed by:
Cole B
Written by:
Alexander C

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