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  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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Trailer Leaf Spring Suspension
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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 1-800-496-5010 for expert service.
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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   (157 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.

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!




by:

Exactly what I needed for revamping my boat trailer




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.




by:

Fit perfectly
Upgraded with this set
of springs
Quick shipping
Thanks




by:

They fit perfect it would have been cool if they included new hardware i mean it just 2 nut and 2 bolts.




by:

Working good still, nice ride for my custom built trailer




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!




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




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.




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


by:

Springs fit great. Very pleased




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.




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.




by:

Worked well size fit great. Still using them




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


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!




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.




by:

3-Leaf Slipper Spring for 3,000-lb Trailer Axles

Ordered the leaf springs and the quality was good. The shipping was fast and the price was good.




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!




by:

Was very happy with the product. My boat trailer riides better now with the new leaf springs!!!!! I have recommended your company to friends with trailers.




by:

Great product, as described, description of the measurements fit right on.
I would & have recommend E-trailer to friends.


Comments
Fit and works as described, Im happy with the product.
Rich M - 10/27/2017


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,




by:

Great service and product on the slipper leaf springs. My trailusage and old 1977 dilly trailer everything fit perfect ,Thanks for the support y'all have at etrailers.




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.




by:

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



25
157
Show More Reviews

See what our Experts say about this Universal Group Trailer Leaf Spring Suspension



  • 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...
  • 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 for...
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  • 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...
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  • 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...
  • 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.
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  • 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.
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  • 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...
  • 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 rating...
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    Image 1 for
  • Will 3-Leaf Slipper Spring for 2,900-lb Trailer Axles Work On a 2,200 Lb Axle
    The 3-Leaf Slipper Spring w/ Flat End part # SP-039275 is rated for up to 2,900 lbs when used as a pair so these will work great on a 2,200 lb axle. They will be a bit stiffer than the factory leaf springs but this also means there will be more support and they won't wear out as quick. In regards to leaf springs, you can go a bit overrated but you wouldn't want to go with an underrated option.
    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...
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  • 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...
  • 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 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...
  • Determine Axle Rating by Measuring to Get Correct 2 Inch Wide Leaf Slipper Springs
    In general, you can measure the diameter of an axle tube to get the rating, though it is more of a guideline and the only way to know for sure is by some identifying marker on the axle and contacting the manufacturer. However, since that isn't a possibility for you, then measuring the tube is the best option, just know that it isn't a 100 percent guarantee. Here are the general ratings: - 1,000 lb – 2,000 lb Axles: 1-1/2 inch - 1-3/4 inch diameter - 3,500 lb Axles: 2-3/8 inch diameter -...
    view full answer...
  • 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.
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  • 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.
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  • 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 axle...
    view full answer...
    Image 1 for
  • 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...
    Image 1 for
  • 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...
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  • 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...
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  • 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...
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  • 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 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...
  • 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 referenced...
    view full answer...
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