bing tracking image
  1. Trailer Leaf Spring Suspension
  2. Dexter
  3. Alignment and Lift Kits
  4. Axle Mounting Hardware
  5. Spring Mounting Hardware
  6. Double Eye Springs
  7. Round Axle - 3 Inch
Dexter Trailer Springs Over-Under Conversion Kit

Dexter Trailer Springs Over-Under Conversion Kit

Item # K71-385-00
lowest price pledge
Our Price: $89.76
You Save: 18%
Trailer Leaf Spring Suspension
Orders above $99 qualify for Free Shipping
Shipping Weight: 9 lbs
In Stock
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me
Moves your trailer's leaf springs to the top of your axle. Works with 3" diameter axles and double-eye leaf springs only. Lowest Prices for the best trailer leaf spring suspension from Dexter. Dexter Trailer Springs Over-Under Conversion Kit part number K71-385-00 can be ordered online at or call 1-800-496-5010 for expert service.
  • All Info
  • Reviews (141)
  • Q & A (0)
  • Videos (1)
  • Photos
  • Why etrailer?

Dexter Trailer Leaf Spring Suspension - K71-385-00

  • Alignment and Lift Kits
  • Axle Mounting Hardware
  • Spring Mounting Hardware
  • Double Eye Springs
  • Round Axle - 3 Inch
  • Dexter

Moves your trailer's leaf springs to the top of your axle. Works with 3" diameter axles and double-eye leaf springs only.


  • Allows moving leaf trailer springs to top of axle
    • For use with double-eye springs only
  • Fits 3" axle
  • Sleeve bolts allow the setup to install level
  • Includes:
    • (2) Spring Seats
    • (8) 1/2" Nuts
    • (4) Steel spacer nuts
    • (4) 7" Long x 4-1/16" wide x 1/2" diameter U-Bolts
    • (2) Tie Plates

K71-385-00 Trailer Springs Over-Under Conversion Diagram

K71-385-00 Dexter Axle Over/Under Conversion Kit

Installation Details K71-385-00 Installation instructions

Video of Dexter Trailer Springs Over-Under Conversion Kit

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Dexter Axle Trailer Suspension - Leaf Spring Suspension - K71-385-00 Review

Today we're going to be taking a look at the Dexter trailer springs over-under conversion kit. This conversion kit is designed to fit 3 inch diameter axles. It's going to allow you to move the the trailer loose springs to the top of the axle without having to change the correct orientation of the axle. This is going to help with leveling your trailer. It's going to help with wheel well clearance. It also adds some height to prevent dragging, dipping, and bottoming out.

One kit is going to come with enough components for one axle, so one kit per axle. This is designed for use with double eye springs only. The unit is going to include 2 spring seats. These are going to sit on top of your axle. It's going to come with 8 nuts. You're going to get 4 U bolts, 2 tie down plates.

The tie down plates are going to sit on top of your loose springs once you have them moved to the top of the axle. It does have all the holes in it, that way the U bolts can wrap around the axle and come up through the plate. Then, you would secure it by installing the included nuts. It's going to come with the spacer nuts. These are going to allow the set up to install level.

Basically, you would have 1 spring seat on top of the axle, then your old spring seat would still be under the axle. The spacer nut is going to fill the gap between the 2 spring seats, so they thread on to the bolts that are welded on to your new seats right here. Again, it's going to fill the gap between the 2 spring seats. You would place this on until it makes contact with the bottom spring seat. Then, what you would need to do, which is highly recommended from the manufacturer is you would tack weld this to the axle to prevent the axle from slipping.

Then, you can finish the tightening process or make any minimal adjustments simply by using a wrench. Everything that you see here on the table is included. It's going to come with detailed installation instructions as well to help walk you through the installation process step by step. It is a bot on installation with some recommended tack welding. Overall, it's a nice unit. We're looking at all steel components, so nice, strong, durable design. Again, this kit is designed to allow you to move the trailer loose springs to the top of the axle without having to change the correct orientation of the axle. Again, it's going to help level the trailer. It's going to help gain some extra wheel well clearance, and it's going to help add some clearance to prevent those situations where you may be dragging, dipping, or bottoming out. That's going to do it for today's look at the Dexter trailer springs over-under conversion kit.

Customer Reviews

Dexter Trailer Springs Over-Under Conversion Kit - K71-385-00

Average Customer Rating:  4.8 out of 5 stars   (140 Customer Reviews)

Moves your trailer's leaf springs to the top of your axle. Works with 3" diameter axles and double-eye leaf springs only.


The lift worked out perfectly,I had the place where I bought the trailer install them because I didn't have a welder to weld the saddle mounts to the axle and that's a must for a safe installation,also I had the place where I bought the trailer do it because they had the capability to align the axle perfect to the trailer after the installation.
The lift added approximately 5 inches to the trailer hight so I could install the off road wheels and tires.The lift didn't affect the handling of the trailer at all.


quick delivery, box arrived damaged missing a u-bolt and 2 nuts. i sourced a replacement locally. i found the directions to be a bit ambiguous but had a good idea how it went together.will likely need to cut off the excess bolt length above the axle after i road test the fit.looks sturdy

The kit should not have been missing any parts. I know you replaced the missing parts however I will have our customer service team reach out to you.
-- Etrailer Expert Jenny N - 09/08/2022


After watching an installation video on google I was able to install and weld this kit on 2 axles in 3-1/2hrs by myself. 2 jacks, jack stands, impact tools and a welder at home help.


Used two kits on a 10k equipment trailer, with 2, 6k lbs axles. The trailer is an Appalachian 16ft with drop down axles and scrapes coming in and out of my driveway badly. It’s used from equipment hauling to mulch and stone. I had to reuse the old plates. The ones provided were’nt wide enough to accommodate the springs by about 1/4- 1/2inch, although they seemed slightly more robust. I also added washers to the u-bolt nuts. Otherwise I would’ve rated it a 5. I followed the instructions and tack welded the new spring seats in place. Each trailer is different, so as a general kit, this worked very well and I would recommend it. This one actually gave me more clearance than I wanted. I didn’t actually measure spring seat to spring, but I estimate on a 3 inch axle it gave me 5-6 inches of lift. All said and done I feel comfortable that it will safely handle a 10k lbs load.


The Dexter over under kit is top quality. The directions were easy to understand . The employee’s at eTtailer are very professional and helpful. I recommend eTrailer to anyone needing parts. They are very helpful.


This over-under kit made it extremely easy to move the axles on my Camper. The spring seats with the adjusting nuts made it easy to keep them aligned for welding. I reused my old tie plates because of my shocks I uses a price of 3x3x1/4 angle to bolt the shock to the tie plate. I had read that some people had problems if the had shocks. This gave my camper the extra ground clearance I needed.


I replaced my RV's axles to 6000# and used the conversion kit as part of that upgrade. I am very pleased with the product including the shipping and the installation.
The U-bolts were too short for the new leaf springs I installed. I had the U-bolts custom made at a suspension shop to replace the stock bolts.


Received the package on Friday afternoon. Reviewed the instructions and postings @ E-Trailer. Pulled the trailer up in front of the house at 0930 Saturday morning and drove it away about 4pm. The biggest time killeer was as others have mentioned getting the 11,000 pound trailer up high enough and safe enough to do the job. Thanks for checking up on me.


This Dexter spring kit worked great! I took more time and removed the axles to get a better position to weld spring perches. All parts worked as they should. Overall a great product!


Kit was packaged excellent. It lifted my trailer enough to help my clearance issue. The directions are good and products are well made. Easy to install with the right tools. Very happy!


I like the Product, but the packaging had problems.
Out of the 6 sets I bought 4 sets only had 3 Ubolts in the box.

Thank you for leaving a review and for bringing this to our attention. Our customer service team should be reaching out to you in the near future.
-- Etrailer Expert Brooke M - 11/12/2021


Contacted Jennifer at 4 PM on a Wednesday informing her that I ordered the wrong size axle spring conversion kit. I asked if she could do her best to get it to me as soon as possible. Whatever she did, it was on my porch by 8 AM the next morning. Job Well Done. Will use again


Kit worked perfectly for my 25’ toy hauler. I tend to take it off road and boondocks so I needed the extra lift this provided. I’ve put several thousand miles on it so far with no issues.


Product is of very good quality, it fit well and did exactly what it was supposed to do, well designed and fairly easy to install, I use my trailer more than most people do and I have been totally satisfied with the parts that I purchased, flipping the axles leveled the trailer right up & it pulls great


Have not built a trailer in 30 years. This is apicture of the one i built for good friend. This turn out very nice, heavy duty . All suspension and lights came from E-Trailer . This is the best place to buy and get information. Thank you, Ed.


Always top Quality items.

Fantastic, very easy and great addition to my trailer
Taz D - 05/20/2022


Fast shipping, great product that installed without a hitch. Worked great.


Omg you guys are great. Perfect kit. I have a double axle Arctic fox great job thx. Got here when you said it would


Good purchase; arrived early; easy to install. Still in service. Did not tack weld as no access to welder but working nonetheless. Very happy.

Arrived early easy to install works well.
megamile - 12/29/2021


Perfect fit super quick shipping


Very Easy Install....Everything you nee d!


All parts fit with just minor grinding. Which was to be expected. But the part that I liked the most was the costumer service. I can’t remember the girls name. But it was the kit that I wanted and needed. But everything on the specs wasn’t exactly what I needed according to your website. And dexsters website directly. According to the website the u bolts were going to be to small for what I needed. Nothing was adding up. It was bothering the girl that was helping me on the phone that it wasn’t making sense. So she had a tech go into the warehouse and cut a box open to verify if the manufacturer was correct or not. Which it turns out that the manufacturer was wrong on the u bolts. They were the bigger ones that I needed. Once again I can’t remember her name. But thank u again for going out of your way to help me out. Great customer service.


This is the easiest kit to use and install when doing an axle flip conversion to your trailer or camper. I did it on my 2004 forest River wildwood 5th wheel. I needed extra ride height and from my Curt Q20 with slider, it sat too much at an angle and was jarring and jerking after every bump I hit. So I installed this kit and it gave my camper about 6” of lift and looks taller! The spacers on the perches made everything easier when reinstalling the axle. Make sure your measurement is right on both sides!!! That is very crucial so your axle isn’t lop sided or twisted! I tack welded the perches to the axle to added strength. You don’t have to but recommended. After towing it approx 35 miles back home from my shop, i was a little nervous since I raised the center of gravity but I drove normal and it towed great!! Camper sits absolutely level and hardly no jerking! I highly recommend this kit to whoever wants to flip their axles !!


It went together fine, lifted the trailer bed a good 5-6 inches off the tires and looks strong; time will tell. First picture is BEFORE, 2nd pic is AFTER


It was exactly as described, shipped fast and was perfect for lifting up my rv

Show More Reviews

See what our Experts say about this Dexter Trailer Leaf Spring Suspension

  • Why The Axles Cannot Be Rotated and Original Spring Seats Be Reused When Flipping Trailer Axles
    The reason you will not want to rotate the axle and just reuse the spring seat is because there is a bow to the axles that flattens out as the weight of the trailer is applied to the axle that if you rotated the axle, the bow would flip and the alignment of the trailer tires would be way off and you would encounter problems with how the tires wear and with overall trailer handling. This is why the Dexter Trailer Springs Over-Under Conversion Kit # K71-385-00 that you referenced includes...
    view full answer...
    Image 1 for
  • How Much Will the Dexter Trailer Springs Over-Under Conversion Kit, # K71-385-00 Raise the Trailer
    First, you would need to have the spring seats welded to the top of the axle. You cannot flip the axle because then the existing spring seats would be bent the wrong way. What you can do is measure from where the springs are attached to the spring seat now up to the top of the axle to determine the approximate amount it will raise the trailer when using the Dexter Trailer Springs Over-Under Conversion Kit, # K71-385-00. To use this kit you will need to have a 3 inch diameter axle. When...
    view full answer...
  • Why Axles Cannot Be Rotated when Installing a Axle Over-Under Kit
    In order to properly move your axle below your leaf springs you will not flip the axle. The reason for this is because there is a bow to the axle that if was reversed would give you terrible wheel alignment. What you would need to do is install the Dexter Trailer Springs Over-Under Conversion Kit # K71-385-00 you referenced. This allows you to keep your axles installed correctly while allowing them to be under your leaf springs. You will need to have new spring seats welded to the top...
    view full answer...
    Image 1 for
  • Dexter Trailer Springs Over-Under Conversion Kit Recommendation for Additional Ground Clearance
    Yes, you can use a Dexter Trailer Springs Over-Under Conversion Kit # K71-385-00 like you referenced to gain a little ground clearance. This product will allow you to move the axles of your trailer from above the leaf springs to below the leaf springs which will give you additional ground clearance. As long as you have a 3 inch round axle this product would work well for you. 3 inch axles are primarily used on 6,000 lb and 7,200 lb axles.
    view full answer...
  • Preventing Fifth Wheel Camper From Dragging When Entering Driveway
    Since the axle is already mounted below the springs, an over-under conversion kit like the # K71-385-00 would not be helpful. Going with taller spring hangers (see link) might be an option, however keep in mind that changing the suspension geometry of your fifth wheel trailer might alter its ride characteristics and make it more prone to trailer sway. Additionally, changing the height might reduce the clearance between the top of your truck bed side rails and the bottom of your trailer...
    view full answer...
  • Raising the Height of a Carry On Utility Trailer with 1-3/4 Inch 2,000 Pound Axle
    We only have over-under kits for 3 inch and 2-3/8 inch axles but nothing for a 1-3/4 inch axle. What you could do is get longer hangers. However, because suspension is meant to travel up and down adding hangers that are 2 inches longer for example does not mean you get 2 inches more height. Keep in mind that by increasing the height of the trailer you make it more susceptible to sway since the center of gravity is changing. If you need more height because the ball mount is too high then...
    view full answer...
  • Options for Adjusting Trailer Height on a Gooseneck Livestock Trailer
    Mounting your axle under your leaf springs will lift your trailer more than 7 inches (4 inches for your axle diameter plus 3 inches for the thickness of your leaf springs and spring seat). Since you have a livestock trailer, that would not be the best option to level out your trailer. The first step that I would take is to check the coupler on your gooseneck trailer. Most gooseneck trailers have adjustable couplers that allow you to adjust the height of the trailer at the gooseneck hitch....
    view full answer...
  • Installation of Dexter Kit # K71-385-00
    I have checked the installation instructions for the Dexter Trailer Springs Over-Under Conversion Kit # K71-385-00, and according to Dexter they strongly recommend tack welding the spring seats in place. Please note that this kit is intended for use with a 3 inch diameter axle and one kit is required per axle. If you have a 2-3/8 inch diameter axle then the # K71-384-00 kit is recommended.
    view full answer...
    Image 1 for
  • How to Tow a Trailer Level Using a Ford Super Duty with a 6 Inch Lift
    If you need the trailer to be higher to be able to tow the trailer level because of the lift on your truck then there is a much easier and safer solution than changing the suspension on the trailer. You just need a ball mount with the correct drop to tow the trailer level. I have included a link to an FAQ article that explains how you will need to measure. Once you know what drop you need you can browse our selection of ball mounts. I have included a link to them for you. I do not recommend...
    view full answer...
  • Tips on Leveling a 5th Wheel Trailer Towed by a 2012 Chevy Silverado Dually
    First, before changing the suspension on the trailer, you can adjust the height of the pin box on the trailer and the height of the 5th wheel hitch up and down. If making these adjustments is not enough then I recommend moving on to an over under conversion kit like # K71-385-00. Using a kit like this does raise the trailer however it also makes the trailer more susceptible to sway. The ride will also feel different although in a dually I am not sure how much you will notice the ride....
    view full answer...
  • Will an Over-Under Conversion Kit Fit a Trailer with a Square Axle
    The over under conversion kits like # K71-385-00 only work on round axles. What you can do depends on why you need to raise the trailer. If you need more clearance under the trailer you can replace the leaf spring hangers with longer ones. You have to increase the height equally for all hangers. For example if you go up 2 inches on the front hanger, all hangers must also go up 2 inches. Raising the height of the trailer can change the ride quality and will make the center of gravity higher...
    view full answer...
  • How Should a Flat Bed Gooseneck Trailer Be Pulled When Empty on a Flat Bed Truck
    Even when the flat bed trailer is empty it still needs to be kept level. When the trailer is level it will have even weight on each of the tires therefore not wearing them more than necessary. As a side note, when you leave your gooseneck trailer high in the front it can cause some sway issues. Sway is not as big of an issue with gooseneck trailer, however, it is something to keep in mind. If your trailer is level when it is loaded and the issue that you are having is the nose is high...
    view full answer...
  • Can a 5th Wheel Trailer be Towed with a Ford F-250 with an 8 Inch Suspension Lift
    Possibly but it depends on how high we can get the trailer and what adjustments can be made to the hitch and pin box. First, a suspension lift makes the towing capacity of the truck unknown and actually lowers it if anything. Just keep this in mind. Measure from level ground to the truck bed and from level ground to the king pin skid plate to see what that height difference is. This will tell you how far off you will be to be able to tow the trailer and if it is possible to get level...
    view full answer...
  • Adjusting Fifth Wheel Trailer for New Truck Ride Height Using a Axle Over Under Kit
    If possible, the best option for making an adjustment for your trailer is to see if the pin box can be adjusted to compensate for the difference in your truck height. You may be able to use the additional mounting locations to adjust the ride height of the pin box so that it will align properly with your new Dodge 2500 4 by 4. To determine the correct over and under kit you will need to measure your existing axles on your 5th wheel trailer. We have kits prepared for 2-3/8 inch axles,...
    view full answer...
  • Recommendations for Allowing a 1991 Fifth Wheel Camper to Sit Level Without Lifting the Trailer
    Since your trailer has already had the axles flipped for increase ride height I would be reluctant to recommend you lift the trailer any more. The higher the trailer sits the higher the center of gravity is and the more likely the trailer would be to sway among other things. Before you resort to that, is your fifth wheel hitch in its lowest position? How about your pin box, is it in the highest position on your trailer? From the picture you submitted it looks like your trailer only needs...
    view full answer...
    Image 1 for
  • How Much Lift Will an Over-Under Conversion Kit Provide
    The lift that you will get with an over-under kit is the diameter of the axle plus the thickness of the leaf springs. The Dexter Trailer Springs Over-Under Conversion Kit, # K71-385-00, fits 3 inch diameter axle, so your trailer will sit 3 inches higher plus the thickness of your springs. If your leaf springs are 2 inches thick, then you will get a total lift of 5 inches. Keep in mind, raising the height of the trailer will change the geometry and give it a higher center of gravity which...
    view full answer...
    Image 1 for
  • Replacement Lens For Light On 2011 Zinger Travel Trailer
    While we do sell several replacement lenses for trailer lights, we need a bit more information about the lens you are wanting to replace. If you can remove the lens cover and send us the number of the light assembly that would help a great deal. If you cannot find the light assembly number you can measure the lens you need to replace and let us know what those dimensions are. We would need the width, length, and depth. I have attached a link to our product page for replacement lenses...
    view full answer...
  • Will Dexter Over-Under Conversion Kit Work on a 1997 Jayco 277 5th Wheel Trailer
    You should also be able to adjust the trailer pin box up or down as needed. But if that still doesn't provide a level ride then you can use the Dexter over/under conversion kit # K71-385-00 (you would need 1 kit for each axle) as long as you are using double eye leaf springs and not slipper springs. Please note that raising the trailer will also raise its center of gravity and could change the ride characteristics and make the trailer more susceptible to sway.
    view full answer...
  • Why Cant an Over/Under Conversion Kit be Used on Slipper Spring Suspension
    When moving the leaf spring stack above the axles using an over/under conversion kit # K71-385-00 there is the potential for more travel in the suspension. Double-eye springs are bolted on so excessive travel would not affect them like it would a slipper spring which is just sort of hanging on to a hanger on one end. But not to worry. All you have to do to get additional height with slipper spring suspension is replace the hangers with taller hangers. We have many different options, see...
    view full answer...
  • Moving Trailer Axle from Below Leaf Springs to Above the Leaf Springs
    Yes, you can use the over/under conversion kit # K71-385-00 to move the axles to the tops of the leaf spring stacks. Dexter has the following note on the conversion kits: When converting from underslung to overslung, the installation of bump stops to prevent suspension over travel and resulting possible spring damage or breakage is highly recommended. Axle travel should be limited to the amount available prior to mounting conversion. When converting from overslung to underslung, adequate...
    view full answer...
  • Is Welding Required to Install Dexter Over-Under Conversion Kits
    It is recommended to tack weld the new spring seats into place but a complete weld job is not required when installing the over-under conversion kit # K71-385-00.
    view full answer...
  • How Much Lift Does Installing an Over-Under Kit on a Trailer Give
    When you use an over under kit like the part # K71-385-00 that you referenced you will gain the diameter of your axle, the thickness of your spring seat, and the thickness of your leaf springs as a lift. Also what you should consider is that when determining how much fender clearance will be left after going to a taller wheel/tire. Only half of the added diameter will be taken up in the fender well. So if you go with a 2 inch taller tire you would only lose 1 inch of fender/tire clearance.
    view full answer...
  • Recommended Over-Under Axle Kit For Car-mate Gooseneck Trailer
    The over-under conversion kit you need for your 6,000-lb axles is part # K71-385-00. This kit is designed to work with 3-inch diameter axles and includes the spring seats, nuts, spacers, U-bolts, and plates. Please note that raising the trailer will make it more susceptible to sway. When you decide to go with larger wheel/tire assemblies you want to make sure you keep at least 3-inches clearance between the fender and the top of the tire, and you will want to make sure you match the...
    view full answer...
  • Would Dexter Trailer Springs Over-Under Conversion Kit K71-385-00 Fit 2007 Play-Mor FW Toy Hauler
    Since you have 3 inch round axles the Dexter Over Under Kit part # K71-385-00 that you referenced is a confirmed fit. That's exactly what this kit is designed to fit so it would work well for you. The height added is going to be the spring diameter plus the height of the leaf spring.
    view full answer...

< Previous
123. . .40

Do you have a question about this Trailer Leaf Spring Suspension?

  • Why

    At we guarantee:
  • Highest quality trailer leaf spring suspension for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate trailer leaf spring suspension information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Robert G
Expert Research:
Robert G
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee John H
Expert Research:
John H
Employee Adam R
Expert Research:
Adam R
Employee Lori W
Expert Research:
Lori W
Employee Rachael H
Expert Research:
Rachael H
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Cole B
Installed by:
Cole B
Employee Wilson B
Updated by:
Wilson B
Employee Matthew E
Updated by:
Matthew E
Employee Noah M
Updated by:
Noah M
Employee Jonathan Y
Video by:
Jonathan Y
Employee Kevin C
Test Fit:
Kevin C

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.

Product Experts Available Now!
Call 1-800-496-5010