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Dexter Trailer Springs Over-Under Conversion Kit

Dexter Trailer Springs Over-Under Conversion Kit

Item # K71-385-00
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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 Axle. 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.
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Dexter Axle 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 Axle

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   (133 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.


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.


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.


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.


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!


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.


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


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.


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!


Always top Quality items.

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


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


Perfect fit super quick shipping


I used two sets of these on a tandem axle utility trailer that I'm rebuilding. The previous owner had flipped the axles using the original spring seats which made the axle and brakes upside down. These worked well for reinstalling the axles correctly. The only problem that I had with these is one stud welded to each spring seat appeared to be closer to the axle then the other. The axle would contact the long nut on that side and prevent it from turning unless you installed the spring seat with the nut fairly close to its final position. I had wanted to install a jam nut behind the long nut to prevent it from backing off but the axle interference issue prevented that. I'll find another way to lock the long nuts from backing off. The set does have good quality components and makes it easy to get your axle position correct. I followed the recommendation in the instructions and tack welded the the spring seats to the axle.

I have had this kit on my trailer for about a year now and have had zero issues with the kits. For anyone looking to raise or lower a trailer this kit is an easy way to ensure that you get your spring seats lined up correctly.
Eric J - 07/23/2020


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


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


etrailer has always done well by me.

used the kit to flip my axles. So 2 kits. Worked well but I did tack weld them like the kit recommended. Raised the trailer 5 or 6 inches so it doesn’t scrape the driveway up any more. No difference in handling when I am towing. I did have to re set up my hitch on the truck.

Hardest part was jacking up the camper and dragging the axles out in the yard.

After a year I am still very happy with flipping the axles on my 2005 Jayco. The hitch and rear bumper have not scraped on the ground all year. Well worth the time and money.
Todd - 07/25/2020


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.


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


After buying a new truck I discovered that my 5th wheel was going to be too low to pull level. after doing some research I found your product which was what I was looking for. I ordered it and in 2 days it was delivered . Every thing went well in installing . The only problem I encountered was the plates did not contain a place to mount my shocks, after doing a little modifying I was able to use my old plates on top of the new ones and mount my shocks.
Perhaps you could provide a plate that would have the hole for shocks.

Very well no problems
K71-385-00 K - 11/15/2014


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


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 !!


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.


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


Kit arrived missing all but 2 of the ubolt nuts. No biggie, had some on hand. Went to install ubolts and they were too short. Bought new ones. Went to use top plate and it was too narrow. Had to make new ones. Only thing I used was the axle perches... Which you can buy anywhere. Total waste of money. Make your own kit like I ended up doing.

Show More Reviews

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

  • 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...
  • How Much of a Lift Will a Trailer Axle Over-Under Kit give a Trailer
    Doing an over-under kit like the part # K71-385-00 that you referenced will raise your camper the diameter of your axles plus the thickness of your leaf springs. So if you go out and measure those two things on your trailer you will know how much of a lift you would get.
    view full answer...
  • Increasing Ground Clearance on Trailer with Drop Spindles
    Since you have a drop axle, you could change it over to a straight spindle axle in order to gain 4 more inches of ground clearance. In order to get a new axle, some measurements of your current axle are needed. You will want to measure hub face to hub face, measure center of spring seat to center of spring seat, and find the axle capacity. The manufacturer name and part number are also helpful. Hopefully, the white sticker in the middle of your axle will have most of this information....
    view full answer...
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  • Over-Under Kit Components and Installation for 2004 Forest River Sierra
    If your axle is a 3 inch round axle, you will want to use the Dexter Trailer Springs Over-Under Conversion Kit # K71-385-00. This conversion kit is for use with double eye springs. The springs do not need to be moved, they will stay installed in the original location. The kit does not come with new shock absorber mounts. The spring perch that comes in the kit will need to be tack welded in place. The new spring perches do not have provision for attaching the bottom end of the shock...
    view full answer...
  • Over Under Axle Kit for Dexter 3,500 lb Axle
    A 3,500 lb Dexter axle will have a 2-3/8 inch diameter. The Dexter Trailer Springs Over-Under Conversion Kit # K71-385-00 is designed to work on this axle diameter so it should work just fine to give you additional lift on your trailer for larger tire/rim clearance. This should give you a lift that is 2-3/8 inches plus the thickness of your trailer leaf springs tall. I would think you would have more than enough clearance to go to a 14 inch trailer rim.
    view full answer...
  • Install Instructions for an Over Under Kit on a Camper Trailer
    I attached a picture that details how to install an over-under kit like the # K71-385-00 that you referenced. You would need to disconnect the wires that run to the brake assemblies but they would easily reconnect when you are done. Its not a difficult process, but if you have basic tools and jack stands you shouldn't have a problem. However, it is recommended that you tack weld the seats in place.
    view full answer...
    Image 1 for
  • What is Height Gain from Installing Dexter Trailer Springs Over-Under Conversion Kit K71-385-00
    When installing an over-under kit like Trailer Spring Conversion Kit # K71-385-00, the height gain will be close to the sum of the axle diameter plus the height of the spring stack. So for this kit which fits 3-inch axles, add the 3-inch axle diameter to the height of your leaf spring stack.
    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...
  • 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...
  • Trailer Axle Over Under Kit Recommendation for Dexter 5,200 lb Axles
    Since you have Dexter 5,200 lb axles we know you have 3 inch diameter axles. Based on that you need the Dexter Trailer Springs Over-Under Conversion Kit, # K71-385-00 which is designed for 3 inch axles.
    view full answer...
  • Recommendation to Raise Rear of Boat Trailer
    Since you already attempted to raise your trailer by using an Over-Under Kit like # K71-385-00 to flip the leaf springs, the only other way to raise the height of your trailer is to have the existing hangers cut off and install taller ones. I recommend having a qualified professional weld the new hangers onto the trailer. You will want to simply measure the existing hangers to make sure you get ones that are taller. I have attached a link that will take you to our available selection...
    view full answer...
  • Recommendation to Move Leaf Springs to Top of 3 Inch Axle on Trailer
    We have exactly what you need! To move the leaf springs on your trailer to the top of the axle, you will want the Dexter Trailer Springs Over-Under Conversion Kit # K71-385-00. This is designed for 3 inch axles and for use with double-eye springs only. This kit will lift your trailer the height of the axle and leaf spring stack, making it easier to tow level with your lifted truck. I have attached a short video demonstration along with the written installation details that you can also...
    view full answer...
  • Can Over/Under Conversion Kits be Used with 2 Inch Wide Trailer Leaf Springs
    The over/under conversion kits such as # K71-385-00 do only work with 1-3/4 inch wide double eye springs. In order to raise the height of your trailer with its wider springs is to use taller spring hangers. I have included a link to our hanger main page for you.
    view full answer...
  • How Much Lift Does an Axle Over Under Kit Provide a Trailer
    For over under kits like the Dexter # K71-385-00 they will raise the suspension the diameter of the axle added to the thickness of the leaf springs. This kit is for 3 inch round axles so you would add 3 inches to the thickness of the leaf springs and you'll get the amount of lift you'd receive.
    view full answer...
  • Availability of Bump Stops When Installing the Over-Under Conversion Kit # K71-385-00
    The instructions for the Dexter Trailer Springs Over-Under Conversion Kit # K71-385-00 for your 3" axle do recommend installing a bump stop when going from underslung (leaf springs under the axle) to overslung (leaf springs over the axle) because of the reduced trailer frame clearance. The closest thing that we have to trailer bump stops is our selection of trailer suspension enhancement which I have linked for you to filter through. These are filtered by axle weight capacity and have...
    view full answer...
  • Over Under Suspension Kit Recommendation for Trailer with 2-3/8 inch Axle
    Since your axle is 2-3/8 inch diameter you could use the Over-Under Kit, # K71-384-00 to move your axle to the other side of your leaf spring and get additional ground clearance. These kits can be installed without welding but the manufacturer strongly recommends having the new spring seat tacked in place on the other side of the trailer axle. When you have cupping wear on a tire it is from the tire bouncing on the road. You will want to check the air pressure in the tire and make sure...
    view full answer...
    Image 1 for
  • Do Spring Seats Have to Be Welded to Install Axle Over Under Kit
    Yes when you do an over-under kit you have to weld the seats to the axle for it to be installed properly. 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...
    Image 1 for
  • Torque Recommendation for the Nuts of U-Bolt Kit K71-385-00
    The torque for the U-bolts are a minimum of 30 ft-lb and a maximum of 40 ft-lb for the U-bolts that come with the part # K71-385-00 that you referenced.
    view full answer...
  • Dexter Trailer Springs Over-Under Conversion Kit Fit Recommendation for 7k Dexter Axle
    Your Dexter 7k axles would be 3 inch diameter axles so the Over-Under kit part # K71-385-00 would be the correct kit to use for your trailer.
    view full answer...
  • Recommended Gooseneck Trailer Adjustment for Towing with a Ford F-250 with 4 Inch Lift
    If your trailer has an adjustable coupler and you have already tried adjusting it to the proper height for towing level, then you could install a cost effective over-under conversion kit on your trailer. Keep in mind that changing your trailer suspension will affect how it rides when it's towed by a truck without lift. It could also create sway while driving on the highway due to the increased center of gravity on the trailer. If you have 3 inch axles and double-eye springs, then I...
    view full answer...
  • How Much Trailer Height is Typically Gained by Installing Axle Over Under Kit
    Over under kits can basically be installed on any axle as long as the axle diameter matches what the kit is designed for. The part # K71-385-00 would work if the axles on your trailer were 3 inches in diameter. Since your trailer weighs 14,000 lbs you most likely have bigger axles though. If you wanted to measure your axles and then email me back with that dimension. Typically the additional height you gain is the diameter of the axle plus the thickness of the leaf springs.
    view full answer...
  • Can Shocks of Trailer be Used with Dexter Over Under Kit
    The Dexter Over Under kit part # K71-385-00 is designed for 3 inch axles which are typically between 5,200 and 7,200 lbs in capacity. The U-bolts that come with this are rated for that amount of weight so you would not need to worry about them being strong enough as they are. I attached a picture that shows how shock kits install on a trailer that has the axle mounted below the leaf spring. You may have to reuse your spring plate since that is where the shocks attach to.
    view full answer...
    Image 1 for
  • Lift Kit Options for Dexter 7,200 Pound Axle on Horse Trailer
    We may have a lift kit available that will work on your Dexter axle, however the P15 SLR information you found refers to general information about where the axle was made. If you can locate a serial number or any other model information on the axle tag, I will be happy to confirm a specific kit if one is available. If the axle is a standard 3 inch round unit, and the leaf springs are currently installed below the axle, you can use the Over-Under Conversion Kit # K71-385-00. This kit will...
    view full answer...

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