Determining The Correct Replacement Leaf Springs For A 2021 Keystone Passport Grand Touring TT

Question

Question:

I need to replace leaf springs on a 2021 Keystone Passport travel trailer. The axle is the 3500 lb dexter, but I would like to upgrade the weight rating of the leaf springs. Can you recommend what I can replace them with? Thanks

asked by: Tyler V

0

Expert Reply:

You could potentially replace your leaf springs with a larger capacity spring but will need to match the length of your current leaf springs to avoid having to remove and reinstall the hangers and rest of the suspension system, which is a giant hassle and a lot more costly than just replacing the springs.

If you have double-eye leaf springs you'll need to measure from the center of one eyelet to the center of the other. If you have slipper springs then you'll need to measure from the center of the eyelet to the end of the top leaf. This will be the "C" measurement in both of the pictures below.

You'll want to get this measurement and then you can look at the larger capacity options in the same length. Upgrading the capacity of the leaf spring will not increase the capacity that the trailer can hold and will give you a stiffer ride so you'll want to keep that in mind when going with a larger capacity option. I've attached a short video below where I'll run you through choosing the correct leaf springs and show you how to install them.

If you want to stick with 3,500lb leaf springs we currently have the following sizes:

23-1/8" # e59SR
25-1/8" # e68SR (Dacromet coating)
27" # e97SR

For 4,000lb leaf springs we currently have the following sizes:

25-1/4" # e57SR
25-1/4" # e93SR (Dacromet coating)
26" # e48SR (Dacromet coating)
26-5/8" # SP-230275 (Slipper Spring)

expert reply by: Kevin C

0

Double-Eye Leaf Spring Measurement
(click to enlarge)

Slipper Spring Measurement
(click to enlarge)

Jerry Q.

4/3/2024

I want to upgrade the leaf springs to a better quality. Mine already seam flat in just a 2 year period on a 2021 keystone bullet 287qbs. My Question is, Does the "C" measurement change by the spring going flat?

Reply

Kevin C.

4/4/2024

@JerryQ Yes, when leaf springs flatten out they become longer. It's why you have to lift the axle and take the weight off of the spring before taking your measurements. increasing the capacity (a reasonable amount) will give you stiffer springs that are less likely to flatten out over time.

Reply

Answer 1

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 2

Trailer leaf springs come in many different lengths and some may have the same capacity but different measurements and/or number of leaves. This is due to different configurations of trailers, axle spacing, and tire size. Ideally you would use the…

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Answer 3

The number of leaves won't matter when going from a 3-Pack to 4-Pack or when going from a 4-Pack to a 3-Pack, so long as the weight capacity is correct there won't be an issue. The leaf thickness can vary from manufacturer to…

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Answer 4

The orientation of the 26" 4-Leaf Double-Eye Spring for 4,000-lb Trailer Axles #e22YR you have installed on your trailer looks just fine to me! You're correct that you want some angle for the shackles to help account for some flex in…

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Answer 5

I reached out to our contact at Redline and he informed me that the Front/Center/Rear Hanger #E4139 is rated for axles ratings up to 7,000lbs. So you will be able to use these on your 2019 Grand Design Reflection 5th wheel.

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Answer 6

Upgrading from 3,500 lb to 4,000 lb leaf springs will make them last longer. Eventually they will flatten since it is inevitable, but with the higher rating it won't happen as fast. Since you're looking to make a small increase this also…

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Answer 7

We can tell you how to determine the correct replacement 6,000 lb leaf springs for your 5th wheel trailer, though don't have a way of knowing specifically what is on any one trailer. It's pretty simple though, as all you have to do is measure…

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Answer 8

For your replacement leaf spring, there are a few things to consider. The number of springs in the stack doesn't determine the capacity, so you will need to know the capacity of your axle so you don't have springs that are too stiff or not…

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Answer 9

The weight capacity of the leaf spring should be based off the weight capacity of the axle. If you cannot find a sticker on the axle that lists the weight capacity then you can go off of the cargo weight. If the cargo weighs around 1,360 lbs I would…

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Answer 10

The leaf springs on a trailer will need to meet or slightly exceed the axle capacity. So if you know the axle capacity then each spring should be rated for at least 1/2 of that capacity on a single axle trailer. The axle capacity may be listed…

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Answer 11

Can you measure the diameter of the axle? That will be a great way to get a ball park on the axle capacity. Typical Axle Diameters Based on Axle Capacity - 1,000-lb - 2,000-lb Axles: 1-1/2 inch - 1-3/4 inch diameter - 3,500-lb Axles: 2-3/8 inch…

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Answer 12

Thank you for providing that information. Leaf springs like the ones you have now typically match the axle capacity on your trailer. Although adding leaf springs with a slightly higher capacity won't hurt, it also is not necessary. Based on the…

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Determining The Correct Replacement Leaf Springs For A 2021 Keystone Passport Grand Touring TT

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