Will A 3-Leaf 2,000 lb Spring Offer A Softer Ride Than A 4-Leaf 2,000 lb Spring?

Updated 09/30/2024 | Published 09/17/2024

Question:

A 2 stack or 3 stack leaf spring for 2000lb capacity can both carry 2000lbs. However, doesnt each leaf come into play progressively? In short, Is the 3 stack a softer ride less harsh when lightly loaded?

asked by: Brian C

Expert Reply:

Hello Brian, good question. The number of leaves in a leaf spring are not always directly related to the strength of the spring. There is truth to what you say I believe. A 3 leaf 2,000 lb spring may offer a slightly softer ride than a 4 leaf 2,000 lb spring. The difference, if any, would be very slight though, and I do not think the difference in ride quality would be noticeable.

When replacing leaf springs we generally recommend keeping the replacement springs identical to the originals just to make sure everything lines up correctly. As long as you match the eye-to-eye length and the axle capacity you will be good. The same number of leaves is recommended but it can be more or less as long as the spring is rated correctly.

expert reply by: Jesse M

Brian C.

9/27/2024

My comparison is that of a truck spring stack. You can take the standard 3/4 ton leaf stack and add an 800lb overload spring and the normal passenger load is none the stiffer. However, when packing a full load on the suspension the overload spring kicks. This is what I'm terming "progressive" engagement. I may be off base with such a comparison but I live in hope. My 2-leaf, 2,000lb spring set is quite harsh. I have 2" of closed cell foam to cushion 100% of the cargo floor and the ride still bursts soda or pop cans. Pray the bottled beer survives. There's not room for a coil spring set-up but motorcycles use variable load rate coil springs, becoming rapidly stiffer as the suspension collapses through its normal compression. My goal it to find some springs that are soft when the trailer is empty but stiffens when loaded to lean is minimized. Please stop short of recommending air assisted shocks. Manufacturers must stop making those things, for so many reasons. Any suggestions come to mind?