1. Bill Pittman
    April 8, 2020 @ 7:58 PM

    This was a great read! (Overslung or Underslung Trailer Springs). I like the triangle diagrams. I’m a little unclear on Dynamic Forces… will go back and read it again. I agree…. Forums are just opinions, and often incorrect. Thanks for your help!


    • Charles
      July 7, 2020 @ 1:07 PM

      I have noticed a few trailers recently including a local one used semi commercially that all use a drop axle flipped.
      At least 3 of 4 appear to use these trailers off the pavement aswell.
      1 of 4 trailers was obviously custom made and very light duty for carrying bicycles.


      • Mechanic
        July 7, 2020 @ 3:53 PM

        Yes, you can do that for more center ground clearance, but it has a cost in strength and stability loss. I wouldn’t advise it. Hmmm, I wonder if that voids a warranty or something.


        • Joseph Lopez
          October 10, 2020 @ 3:27 PM

          I have a pontoon and my trailer has 16 inch wheels I cant put my boat in water i can put my springs at the bottom and be ok ?


          • Mechanic
            October 10, 2020 @ 9:52 PM

            That’s a big question with lots of possibilities. Will the boat drag the ground ever? are the spring mounts OK to switch on your axle? Is there clearance? Will you need to get different springs? It’s not as simple as flipping them, but it can be done. Please visit a local trailer repair facility and let them guide you.

  2. Darren
    August 26, 2020 @ 4:11 AM

    I have a drop axle and am happy to keep it that way but want to have my springs rest on the axle obviously upgrading u bolts etc …. I see that the torsion of the spring under brakes would be kept at a minimum but giving me the extra clearance I need… what are your thoughts.


    • Mechanic
      August 26, 2020 @ 11:22 AM

      I assume you mean use overslung springs on the drop axle? Yes, that can be done, but you’ll also need to weld the spring seat bracket on the top side of the axle. Make sure the left and right are parallel and coplanar.


  3. Ian Bell
    February 20, 2021 @ 2:10 PM

    you stress not to flip the drop axle but to didnt go into any detail as to why not. the obvious isse is that the camber may be reversed if the drop axle has an existing camber, but what of the increased localised forces that twist on the leaf spings where the ubolts attatch the axle. is it a concern ?


    • Mechanic
      February 20, 2021 @ 6:31 PM

      All those reasons and more. The instability of the perch, and the torsional stresses on the springs, and the u-bolts as you mentioned. Good observations.


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