Do You Carry Add a Leaf for Trailer Leaf Springs?

Updated 07/10/2025 | Published 07/08/2025

Products Featured in This Question

CE Smith U-Bolt Kit for Mounting 3,500-lb, Round Trailer Axles - 5-1/2" Long U-Bolts - Zinc

(1100)

$45.00

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

(2443)

$58.23

Question:

Hi, I have an old, custom built utility trailer with 1-3/4 wide leaf springs. I need a pair of add-a-leafs, but for some reason I cannot find them. If you carry them, can you provide a part number for me?

asked by: Ed

Expert Reply:

Hello Ed,

I am sorry but we do not have add a leaf for trailers. I recommend that you get new leaf springs. If you could please let me know what your axle capacity is, and the eye to eye measurement on your leaf spring while unloaded, I am happy to find the right leaf spring for you. Your measurement will most likely be longer than what you actually need as they do flatten over time.

For example: if your axle is 3,500 pounds, and you get a measurement around 26", you will need the 4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles - 25-1/8" Long # e54SR.

Did you custom build this trailer yourself?

expert reply by: Kate F

7/10/2025

Thanks for the response, Kate! I didn't built it and I'm learning as I go, so I'm unsure about the axle capacity. It has a 5-leaf double-eye spring pack and it's 36" from eye-to-eye. I see from my research that it is a much longer spring pack than anything for a trailer, so I'm guessing it was from something like an old Jeep. If you have a 36" long, double-eye, 1.75" wide spring pack, OR an add a leaf for that spec, I'd love to know! Thanks! Ed

Kate F.

7/10/2025

@Ed I just tried to do a search for a 36" long leaf spring and was not successful on the Google search. If there is no longer an axle tag on the axle, you can measure it to find out what the capacity is. I attached a help article going over how to measure. If it is 1 1/2"- 1 3/4" - 1 1/2"- 1 3/4" is 1,000 - 2,200 - 2 3/8" is 3,500 - 3" is 5,200 - 7,000 Those are going to be your most common sizes. I never like to tell people this, but since I am not having any luck on Google searches, you may need to re-do the suspension by welding on new hangers like # APS4. If you go to that product page there is a good diagram on how it should be spaced out. That way you can use a more common size leaf spring.

Helpful Links

faq-how-to-tell-weight-rating-trailer-axle.aspx

7/10/2025

@KateF It's 2 3/8", so evidently a 3,500lb axle. And I appreciate your honesty. I was thinking the same thing about needing to rework the hangers. Thanks for the info! Appreciate you! Ed

Kate F.

7/10/2025

@Ed My pleasure Ed. If you have any other questions, please ask away. I attached a help article on, "Double-Eye Trailer Suspension." Lot's of useful information in there. Hope you enjoy the rest of your day =)

Helpful Links

faq-double-eye-trailer-suspension-review.aspx