Recommendation For Leaf Springs and Shackle Straps on a 2001 King Boat Trailer

Question

Question:

I recently purchased your part #5257035 Double eye leaf spring hangar to replace a broken one on a 2001 King boat trailer. Eye to eye dimensions are 25.25. What length spring and what length shackles should I use as I believe the current ones are incorrect and have been replaced before? King trailers lists a maximum load of 1725 lbs which is in line to my boat weight. I believe the trailer has a 3500 lb axle, 2.375inch diameter.

asked by: Kelly H

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Expert Reply:

When replacing the leaf springs on your boat trailer you will need to match all of the dimensions and the spring capacity as closely as possible to the original spring. Usually the measurement from eye to eye will lengthen and the height measurement will decrease with wear. See picture I have included that will show the measurements you will need to match to replace your leaf springs.

The number of leaves in a spring pack does not have to remain the same as long as the weight capacity is inline with the boat trailer and axle rating and the measurements match the existing spring hardware.

For leaf springs on a 3,500-lb axle with an eye-to-eye dimension of 25-1/8 inches, I would have two choices. The 4-Leaf Spring, part # e54SR, which has 4 leaves, and the 3-Leaf Spring, part # e57SR, that has 3 leaves. You will want to make sure the measurements on your these two part numbers will match the measurements on your existing leaf springs.

It is recommended to replace leaf springs in pairs to ensure a balanced load on the boat trailer when towing.

If you need shackle links on your single axle trailer the normal length used on a single axle trailer is 3-1/8 inches. I have the TruRyde Shackle Strap, part # TRSL313. You would use two shackle straps per leaf spring on a single axle.

I am including a link to a FAQ page on Double-eye trailer suspensions.

expert reply by: Jeff D

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Answer 1

You are indeed right to think this way. When picking out the appropriate leaf springs for your custom built trailer you will want to choose them based on what the actual loaded weight of the trailer will be. Just make sure that the leaf springs…

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Answer 2

I contacted MORryde and this does happen from time to time as the weight of the trailer can spread out the axles due to downward pressure on the springs/suspension. Odds are the 35" wheel base #MR27ZR will be the correct one for you, but…

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Answer 3

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 4

To correctly measure a leaf spring, you'll want to jack the trailer up on jack stands so the axle is hanging freely, then measure directly across from the center of one spring eye to the other, as shown in the provided diagram. The height of the…

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Answer 5

Thank you for providing the specs for the suspension components that you already have. Correct hanger spacing really depends on the components being used such as springs, hangers and equalizers. Most of the hanger spacing dimensions that we have are…

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Answer 6

Well shackle length is mainly based on the height difference between the front and rear hangers. The rear hanger normally doesn't hang as low as the front so that the shackle can offset the difference and add the ability to move. What is the…

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Answer 7

For a single axle trailer, you want the shackle strap to be able to move so that you have the spring deflection needed for your suspension. Angled like the photo or even almost vertical is fine you just don't want the shackle strap to bind and…

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Answer 8

Yes, going from a 4 leaf to a 6 leaf spring would add slightly to your ride height. For example, if the current 4 leaf spring has 3/8" thick leaves, and you go to a 6 leaf spring with 3/8" thick leaves, you would be adding 3/4" of…

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Answer 9

Hey Patrick, so for your leaf spring upgrade I am going to need to know a couple of things before I can get you over to the right part. Specifically, the length from eye to eye, the spring width, leaf thickness, and the number of leaves. From here I…

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Answer 10

The hangers you currently have on your trailer are ones I have run into before. That being said, I spoke with MORryde and the #MR27ZR will still fit your trailer, but there is a modification that will need to be made. You’ll have to trim according to…

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Answer 11

When replacing shackle straps they should be the same length as the ones that were previously on your tandem axle trailer; replacing them with longer straps will result in additional play in your trailer suspension which could lead to additional wear…

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Answer 12

To find the load capacity for your axle you should look on the trailer VIN plate or sticker that lists the VIN number. The weight rating of the axle should be listed on that same plate or sticker. Also, the axle could have a tag or plate on it that…

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Recommendation For Leaf Springs and Shackle Straps on a 2001 King Boat Trailer

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