How To Look For Replacement Leaf Springs, Equalizers, Shackle Links, Etc. For Old Flatbed Trailer

Updated 05/06/2026 | Published 05/02/2026

Products Featured in This Question

Dexter Heavy-Duty Suspension Kit for Tandem-Axle Trailers - 1-3/4" Wide Double Eye Springs

(1099)

$224.13

4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles - 25-1/4" Long

(310)

$92.55

Question:

Hello, I need to replace the suspension on my flatbed trailer. I dont know what correct parts I need. I want to replace everything that comes in Code: AP233 and the leaf springs. How do I get the correct size parts? IE the equalizer, shackle links and correct leaf springs. I don't know the brand or weight rating on the axles, no tags or stickers. Its an old trailer.

asked by: Jeremy S

Expert Reply:

Hey Jeremy, I can help you out with that! It can be a little tricky with older trailers, but normally it all works out just fine.

I'd start by measuring the diameter of your axles which will give us the axle capacity to start. For example, 2-3/8" diameter is the common 3,500lb axle, 3" is the 5,200lb-7K axle, 3-1/2" is the 8k axle etc.

Then the main measurement for finding the leaf spring is the center of eye to center of eye measurement on the leaf spring when the trailer is unloaded and tires are in the air. This way the springs are not flattening from the weight of the trailer which can throw off the measurement.

So with that info we can determine which leaf springs will work. For example, the 4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles - 25-1/4" Long # DX23CR measures 25-1/4" between the mounting eyelets, and is rated for a 3,500lb axle.

Then the equalizer and shackle straps will need to be measured for the correct replacement kit. Just try to measure the equalizer bolt hole to bolt hole and overall length, and the length of shackle straps from eye to eye.

I know that's a lot of info, but it's all necessary to get the correct setup. Worst thing you want is to waste time and money replacing the wrong parts and then have the suspension geometry all wacky. Let me know what you find out and I'll be here to help!

expert reply by: Andrew N

Jeremy S.

5/5/2026

Ok so I measured my axle and it’s 2-3/8” so I have 3500lbs axles. It looks like eye to eye on the springs are 25-1/4”. They aren’t the normal u shape, they have a slight w shape now. Is the 25-1/4” still a good measurement? I have 4 leaves and the pack thickness is 1-1/4”, not a very accurate measurement The equalizer is 7-3/4” bolt hole to bolt hole. The shackles are 2-3/4” from what I can tell. Those bolt holes are elongated. When I haul anything my axles are sitting on the frame and the top of my tires are rubbing the fender.

Andrew N.

5/5/2026

@JeremyS Cool thanks for the info. So you'll just want the 4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles - 25-1/4" Long # DX23CR along with the Dexter Heavy-Duty Suspension Kit for Tandem-Axle Trailers - 1-3/4" Wide Double-Eye Springs # K71-449-00. This all matches what you told me, and gives you everything necessary for replacement. The wet bolt kit is a nice upgrade since it has zerk grease fittings for longer lifespan.