Redline Trailer Suspension - Leaf Spring Suspension - 29-31 Review Video

The standard diameter for trailer leaf spring bolts is 9/16 inch which is why the part #E4139 and all similar options have this hole size. We don't have anything with a smaller diameter but my guess is what you have is actually 9/16 inch.

Hey Rob, the bolts that come with the equalizer kit part #AP233 that you referenced are Grade 5.

I do have a way to help you figure out what you need, but we unfortunately don't have a database with those exact parts so we will have to go the old fashioned way of taking some measurements. From what I could find I believe that you have tandem…

To get your Dexter E-Z Flex Equalizer lower so the tires on your 2-17 Nitro Z19 boat trailer are not hitting the fenders I recommend having taller center hangers installed. Base on the pictures you provided it looks like your current hangers are…

I recommend using the Dexter Heavy-Duty Suspension Kit for Tandem-Axle Trailers - 1-3/4" Wide Double Eye Springs #K71-359-00. This kit has heavy duty shackles, wet bolts, and also equalizers with built-in grease zerks. This will give you…

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…

Thanks for the picture! The spring shouldn't hit the frame like yours does in the picture, so the correct solution would be to either add a longer front hanger or using a shorter spring. The correct replacement hanger will be dependent on the…

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…

The axle is self-aligned by the spring center bolt so there's no need to slide the axle. Axle manufacturers weld the spring seat in a specific location to align perfectly with the center bolt/nut on the leaf spring. Once all parts are assembled…

I went out into our warehouse and pulled a Front/Center/Rear Hanger for Double-Eye Springs, part #E4139, and measured the outside width of it. It measures 2-5/16 inches from the outside of one side of the #E4139 to the other side. Check out the…

Although the wet bolts have splines to help prevent them from rotating (see attached picture), it is not crucial that they remain still. If they feel like they are tightened properly and they don't seem to be worn out then you will be good to go.…

The equalizers in trailer suspension hanger kit #AP233 are 5-3/4 inches long measured from the center of one spring eye to the center of the other spring eye. I have included a picture illustrating this for you.