Replacement Leaf Springs for a 1,500 Pound Boat Trailer

Question:

Hi, needing to find a leaf spring for my husbands boat trailer. 2004 Performance Model J 15 on the title it says...G.V.W.R. 1560 lbs., if this helps any. I do not know what that means....lol

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Expert Reply:

The GVWR is the gross vehicle weight rating which is the most that the trailer can weight when loaded and ready to tow. Since that figure is 1,560 pounds it is likely that the axle on the trailer is a 2,000 pound axle. That would mean you need to look at leaf springs rated for 1,000 pounds each.

There are 2 types of trailer leaf springs that we carry: double-eye and slipper. Double-eye springs have an eyelet on each end whereas slipper springs have one just on one end and sort of a hook on the other end. Spring # SP-178275 is a slipper spring.

Double-eye springs are all 1-3/4 inches wide and slipper springs come in different widths. Measuring for a spring requires taking the weight off of it by jacking up the trailer or by removing the spring. On a double eye spring you measure the center to center distance from one eye to the other. On a slipper you measure from the center of one eye to the apex of the hook end.

For a 1,000 pound capacity double-eye spring for use on a 2,000 pound axle we have # SP-169275 which measures 20-1/4 inches long.

For a 1,000 pound capacity slipper spring for use on a 2,000 pound axle we have # SP-179275 which is 24-5/8 inches long.

Once you know the type of springs required on the trailer and the length you can determine if any of the above springs are a match. You always want to replace the springs in pairs because if you replace just one they won't wear evenly and that can lead to other problems such as uneven tire wear and tracking problems (how the trailer follows the tow vehicle).

I have included some helpful links on trailer suspension for you as well.

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Michael H

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