Recommended Axle Flip Kit for a 3,500 lbs Drop Axle
Updated 01/07/2026 | Published 01/01/2026
Question:
My Haulmark 7x16 cargo trailer has Dexter 3500 4" drop axles. I have done a conversion to make it a mini toy hauler. I would like to increase my ground clearance. I see that you have two options available. The axle flip kit, or purchasing straight axles. My question is which product is better for my application? I also wonder about the performance of the suspension? Seems to me, that the flip kit changes the suspension from its factory position. Thank you,
asked by: Brian B
Expert Reply:
Hey Brian. I recommend using the Dexter Trailer Springs Over-Under Conversion Kit item # K71-384-00. We've had quite a few customers over the years make this change their trailers with lots of success. Doing this will give you a lift equal to the axles' diameter and the height of the leaf spring packs.
You're going to change the geometry of your factory suspension either way. Replacing your drop axles with straight ones has all the potential to get expensive depending on how long the hub face measurement is and where your spring seats are located. Plus you'll need new U-bolts.
The Dexter Trailer Springs Over-Under Conversion Kit item # K71-384-00 fits 2-3/8" diameter axles so this kit is exactly what you need for a Dexter 3,500 lbs axle. They're sold individually so you'll need two kits.
If you would like me to check and see if we have a replacement straight axle, I would just need to know your hub face and spring seat measurements.
You can add this information, along with any other questions you have, where it says Reply to Jerred H.
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Dexter Trailer Springs Over-Under Conversion Kit
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Brian B.
1/5/2026
Jerred, I really appreciate your insight into my next project, that will improve my little snowbirding home. I am from Milwaukee, and currently in Brownsville, TX checking out the Space X Starship factory. I will be heading west, and the added clearance should get me into some really great boondocking spots. With your recommendation, I will be placing an order today for 2 sets of the axle flip kits for my trailer. Thanks, Brian Bogue