How to Measure Trailer Leaf Spring to Find Correct Replacement

Question

Question:

How do I measure the length of utility trailer springs, straight across or along the curve? The ones on there now measure 32 1/2 inch along the curvature from the center of one bolt hole to the center of the other bolt hole.

asked by: Cliff C

1

Helpful Expert Reply:

To correctly measure a leaf spring, you'll want to jack the trailer up on jack stands so the axle is hanging freely, then measure directly across from the center of one spring eye to the other, as shown in the provided diagram. The height of the spring and the distance from the spring eye to the center of the spring can also be helpful in finding the correct replacement.

To ensure you're getting the correct leaf springs, you'll also need to know the capacity of your axle. If you can find that information on the axle itself, we can make a pretty good guesstimate if you can provide as much as the following information as possible:

Axle diameter (or circumference divided by 3.14)

If the axle is 1 to 1-1/2 inches in diameter, it's likely a 1000 lb axle
2-3/8 in diameter, 3500 lb axle
3 inches in diameter, 6000-7200 lb axle
3-1/2 inches, 8000 lb axle
4 inches, 9000 axle
5 or more, 10000 lb axle

Knowing the wheel bearing reference numbers or the wheel's bolt pattern will also be a good clue to the axle capacity.

expert reply by: Mike L

1

click to enlarge

Tim K.

7/30/2020

I've done measurements. 25 from eye to eye. 1and 3/4. Wide 8 lugs 7 springs. It's a 40fr toy hauler Any suggestions would be greatly appreciated. No one and here has anything like that

Chris R.

8/10/2020

We do have some leaf springs available that closely match the length you measured. It's important to keep in mind that leaf springs will stretch a bit over time, so you're likely wanting a new set that's just a little shorter in length. A 24-7/8" long set like # SP-222275, which is designed for 5,300 pound axles, would work great. If you can tell me what capacity your axles are I will be happy to verify this will work or suggest an alternate replacement.

Randy W.

5/6/2021

@ChrisR Dear Chris R I have a 1988 prowler lynx 18' dual axle travel trailer. It has 3 leaf leaf springs the weight is 2880. The sticker on the axle says 2500 lbs. can not find the size anywhere for our camper due you have any idea.

Jon G.

5/6/2021

@RandyW If you can get me the dimensions like what Mike talks about in his answer above I can see if we have something for you. Unfortunately we don't have a way to see what initially came on your trailer.

See All (8) Replies to Tim K. ∨

Answer 1

Hey, Lance. The direction the springs are in doesn't matter. They can be to the front or to the rear of the axle and will perform the same either way. What kind of trailer are you working on?

view full answer...

Answer 2

Yes, it is! Honda and other manufacture's like to leave the fuses out of new vehicles that do not come with a functional towing package to save on costs. You can verify if you're missing the fuses by checking your fuse box but I am pretty…

view full answer...

Answer 3

Your axle has dimensions that we don't have any direct leaf spring style axles for but we do have a Timbren axle less kit like the part #ASR3500S05 which is a 3,500 lb axle solution. This is similar to a torsion setup but uses a rubber spring and…

view full answer...

Answer 4

The only way to get a new control panel would be to replace your entire Smart Jack with part #LC643589. I reached out to my contact at Lippert who confirmed that the only replacement parts for the jack includes hardware like the pin or the footplate.…

view full answer...

Answer 5

Trailer leaf springs can grow longer after many years of use. A new springs that measures 25-1/4-inches long like #e57SR could easily measure 25-1/2-inches after years in service on a trailer. Springs can lengthen as much as 3/4 of an inch. If your…

view full answer...

Answer 6

Hey Jeff, since you have a Bulldog powered 4k trailer jack part #BD500199 the correct replacement manual override rubber plug would be the part #BD500201.

view full answer...

Answer 7

A drop axle certainly can make it tough to reach the star wheel adjuster on a drum brake. The adjuster spoon tool we offer #W80630 has a 90-degree bend that will often let you get access to the adjuster even on a drop axle. Essentially you will need…

view full answer...

Answer 8

Hello Damon, thanks for reaching out. It looks like both the fwd and awd models of the 2015 Acadia can be flat towed. I will start with a parts list followed by a few notes about towing your Acadia. - Demco Classic Base Plate Kit - Fixed Arms…

view full answer...

Answer 9

Hey John, I'd be happy to help you out! You'll likely need the MORryde Kit #MR46ZR that comes with 2-1/4" long shackle straps, or the Kit #MR76ZR that comes with 3-1/8" long shackle straps, but it would be a good idea to double…

view full answer...

Answer 10

To determine the size of the hub assembly you need to purchase you have to determine which bearings are in the old assembly. If the old assembly has L44649 inner bearings, you would use the hub you chose #8-258-5UC1. If the inner bearings are marked…

view full answer...

Answer 11

The length of a fender is measured from the longest point, at the very bottom of each end across. Then the height is measured from the tallest point, right in the center. For example, the CE Smith Single Axle Trailer Fender #CE17720 is 22-1/2"…

view full answer...

Answer 12

We have found that the Seaflo Diaphragm water pumps like the part #SE57FR are very quiet compared to other options but especially compared to the Shurflo pump you have. This is also a 3 gallon per minute pump rated for 55 PSI.

view full answer...

How to Measure Trailer Leaf Spring to Find Correct Replacement

Product Page this Question was Asked From

Featured Help Information

Miscellaneous Media

Continue Researching