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

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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 800-298-1624 for expert service.
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  • Reviews (142)
  • Q & A (34)
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  • Why etrailer?

Universal Group Trailer Leaf Spring Suspension

  • 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

Item # SP-039275






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   (142 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:

Working good still, nice ride for my custom built trailer



- 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!



- SP-039275
by:

The 30" three leaf, slipper style spring was an exact replacement for the broken spring in this old boat trailer. Admittedly, the original design of the trailer suspension is a bit awkward, but the replacement spring fit right where it was supposed to. Would recommend.



- SP-039275
by:

These new leafs raised the suspension 2" as my old ones were really worn out. I was able to change them both within an hour as I had the use of a forklift to hold up the trailer, and impacts to loosen the old bolts. When/if I need them again, I would buy these.



- SP-039275
by:

Super service getting all the right parts. I received the parts in just two days it took about one hour to change both springs .everything fit grate back on the road.thanks



- 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.


Comments
these replacements are better than what the trailer had. i am very pleased.
Dan - 02/04/2021


- SP-039275
by:

Fit perfectly Upgraded with this set of springs Quick shipping Thanks



- SP-039275
by:

Great products just wish the shipping end would of kept the box in better condition. Appreciate all the customer service I’ve received and will be using the company soon for another trailer!



- SP-039275
by:

Purchased these as a direct replacement to a much older set. Huge difference in strength and quality from what I previously had on the trailer. Matching the size using the product chart was very helpful.



- SP-039275
by:

The leaf springs were an easy fix even on a very cold wintery Saturday afternoon. The fit was perfect and shipping was quick.



- 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.



- SP-039275
by:

Wth rusted out leaf springs on my trailer but with zero experience replacing them, I contacted etrailer and Shawn was very helpful in selecting the right parts and taking me through the process. She was patient in terms of helping me take the right measurements and suggesting the bolts and pieces I needed to do the job right. Everything came well packaged and complete two days later. An hour after that the springs were in my trailer and now has a boat sitting on it. Thanks!



- SP-039275
by:

Really like new springs! Got them sooner than expected and at a great price. I will recommend e-trailer to all of my friends!



- SP-039275
by:

Thank you so much. Parts were delivered earlier than expected and fit perfect all I can say is awesome



- SP-039275
by:

The springs were an excellent fit for my older Chrysler boat trailer. The U bolts I ordered were a little too large but that's ok.....They were returnable but I'll keep them for another trailer project in the future. I would recommend dealing with etrailer. Very helpful on the phone and during the order processing. I had the package within a few days.


Comments
The trailer springs I ordered are working fine. I have no complaints or issues at all. I highly recommend etrailer for anyone in need of any type of trailer parts.
Charlie Y - 11/02/2014


- SP-039275
by:

I made a dumb mistake by ordering the wrong slip springs from etrailer. The part numbers for the springs I wanted and the ones I received were very similar, and I must have been distracted by my kids during the ordering process. I called etrailer and they were very professional on the phone and quickly got the correct springs shipped. Their service is good and I will shop with them again. Thanks,



- SP-039275
by:

Outstanding product. Easy install, easy to follow directions.



- 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.



- SP-039275
by:

Springs fit perfect, fast delivery



- SP-039275
by:

Springs fit great. Very pleased



- SP-039275
by:

Great spring. Fit perfectly



- SP-039275
by:

Came in on time fits perfectly on my boat trailer



- SP-039275
by:

Always launch in Salt water, rinse when I get home. Still look amazing, very little rust



- SP-039275
by:

ordered new trailer tires/wheels, springs, etc... except for the fact they sent me painted not galvanized wheels, but quickly fixed the issue, could n't be happier. priced right, delivered promptly, great quality, etc.. have ordered here before and just as happy.



- 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


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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...
    Image 1 for
  • Replacing Old Slipper Springs and U-Bolts
    Though the leaf springs are rusty, they do not seem to look pitted, so they should still be fine. It wouldn't hurt to clean them off with WD-40 or a rust remover to make sure they don't get worse. If you did want to replace them though, you could go with something like the Universal Group # SP-040275. As I couldn't tell 100% how wide the leaf spring is, this is a 1 3/4 wide one. It is also much longer with the overall length of 30 inches, so the rear hanger would most likely need to be...
    view full answer...
    Image 1 for Image 2 for Image 3 for Image 4 for Image 5 for
  • Replacement Slipper Leaf Spring for Triton PWC Trailer
    The best slipper spring option for your Triton PWC trailer is going to be the Slipper Spring part # SP-039275 as it's for up to a 2,900 lb axle, is a 3-leaf setup, and is 1-3/4 inches wide. It does have a flat end though and not a radiused end but that shouldn't be an issue.
    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...
  • 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...
    Image 1 for
  • 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...
  • 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...
  • 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...
  • 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...
    Image 1 for
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • Determining Correct Replacement Slipper Springs For 1982 TeeNee Trailer
    I would be happy to help! First you will need to measure the slipper springs on your 1982 TeeNee trailer from the center of the spring eye to the end of the spring as shown in the included diagram, and the width of the spring. You will need to jack up the trailer and secure it with jacks stands to take the weight off of the spring before measuring as if there is weight on the spring it will stretch and give you an inaccurate measurement. Second you will need to determine the weight...
    view full answer...
    Image 1 for
  • Determining Which Replacement Leaf Springs and Bearings For 1985 Boat Trailer
    I would be happy to help! Starting with the leaf springs you will need to know the width of the leaf spring, if it is a double eye spring or a slipper spring, the axle rating of the axle on your boat trailer, and the length of the spring. To determine the axle rating you will want to check the axle tag on the center of the axle, or if the tag is missing we can get really close by using the GVWR of the trailer. For example the 3-Leaf Slipper Spring w/ Flat End for 2,900-lb Trailer...
    view full answer...
    Image 1 for Image 2 for Image 3 for Image 4 for
  • 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...
  • 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 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 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...
    Image 1 for
  • 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...

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