FAQ

WHAT function do leaf springs serve?

Besides supporting the weight of a vehicle, the leaf springs control the ride height and keep the tires in contact with the road. Springs also affect alignment angles and are the most important components in controlling the "feel" of a vehicles suspension system.

WHAT is a multi-leaf spring?

Multi-leaf springs consist of more then one plate of spring steel.

WHAT is a mono leaf spring?

Mono (single) leaf springs consist of one plate of spring steel. Usually the spring is tapered and is thick in the middle and tappers out thinner to the ends.

WHAT is a Add-A-Leaf?

An Add-A-Leaf is a extra leaf added to a leaf spring pack. Add leafs are installed to increase vehicle carrying capacity or to create a firmer ride.. They are also used to lift vehicle ride height. The number or leafs added and the thickness of the leafs directly determine the percentage of ride quality/height change.

WHAT is a overload?

An overload is a second stage leaf spring which is engaged when load is applied. It is usually located at the bottom of a leaf spring assembly. Most of the time it is tapered. Top mount overloads are auxiliary overloads located at the top of a leaf spring assembly.

WHAT is Re-arching?

Re-arching is a process of re-curving each leaf spring to original or custom specifications. Once the springs are individually re-arched they are then heat set. Heat setting is done by heating the spring to a specific temperature for a specific time.

WHEN do leaf springs need to be replaced?

There is no standard life expectancy for leaf springs. In general, leaf springs on smaller lighter weight vehicles tend to last longer then leaf springs on heavier full-sized vehicles applications. To determine when coil springs need to be replaced have the springs inspected and the vehicle ride height checked by a trained professional.

HOW are leaf spring inspected?

The most common method of leaf spring inspection is checking the vehicle ride height. Measure! Don't rely on eyesight alone! This method will only catch the extreme cases of spring sag or leaning. In addition to checking ride height, look for these signs, which also indicate the leaf spring requires attention: Examine each spring for stress cracks, missing leafs, or shiny spots between leafs. Damaged bushings or bump stops on the frame. Front end of vehicle nose dives when braking or vehicle sway. Spongy ride. Vehicle that commonly carry extra weight, resulting in unlevel condition most of the time (family transportation, work trucks, and sales fleets).

HOW do I measure a leaf spring?

Add pic

WHY replace Leaf springs?

There are several reasons to replace leaf spring: Worn or sagging springs - Weak springs lower the chassis height of a vehicle, resulting in premature tire wear and poor handling characteristics. Sagging when loaded - Vehicles used for family transportation, RV's, works trucks, or sales fleets can benefit from upgrading to heavier duty leaf springs. Broken original springs - Certain vehicles have been known to have a very high failure rate of broken springs.

WHAT function do coil springs serve?

Besides supporting the weight of a vehicle, the leaf springs control the ride height and keep the tires in contact with the road. Springs also affect alignment angles and are the most important components in controlling the "feel" of a vehicles suspension system

WHAT is a Custom Coil?

Custom coils are designed to your exact specifications. They can be made either constant rate or variable rate.

WHAT should I know about custom coils?

Custom coils are made to your exact specifications. We can also help design the coils and give you valuable, experienced, and professional input.

WHAT is a Constant Rate Coil?

Constant rate springs deflect the same amount each inch. An example would be: 200 lbs. = 1 inch deflection, 400 lbs. = 2 inch deflection, 600 lbs. = 3 inch deflection, and so on. Constant rate coils have will restore your vehicle to its original height and ride.

WHAT is a Variable (Progressive) Rate Coil?

Variable rate springs deflect at different amounts per inch. An example would be: 200 lbs. = 1 inch deflection, 600 lbs. = 2 inch deflection, 1000 lbs. = 3 inch deflection, and so on. Variable coils have a soft initial spring rate and a much firmer spring rate to handle more weight, decrease sway, and improve handling.

WHAT is a Cargo Coil?

Cargo coils are identical to variable rate coils except they are for heavy duty applications.

WHAT is spring rate and load rate?

Spring rate is the amount of force that is required to compress, extend, or twist a spring one inch. Usually spring rate is measured in pounds per inch. Load rate is a is the amount of weight the spring is designed to carry at a certain height.

WHEN do coil springs need to be replaced?

There is no standard life expectancy of springs. In general, coil springs on heavier full-sized vehicles tend to last longer than those on smaller light weight applications. To determine when coil springs need to be replaced have the springs inspected and the vehicle ride height checked by a trained professional.

HOW are Coil springs inspected?

The most common method of coil spring inspection is checking the vehicle ride height. Measure! Don't rely on eyesight alone! This method will only catch the extreme cases of spring sag or leaning. In addition to checking ride height, look for these signs, which also indicate the coil spring requires attention: Examine each spring for stress cracks, missing coils, or shiny spots between coils. Damaged bushings, bump stops, or MacPherson Struts. Front end of vehicle nose dives when braking or vehicle sway. Spongy ride. Vehicle that commonly carry extra weight, resulting in unlevel condition most of the time (family transportation, work trucks, and sales fleets).

WHY replace coil springs?

There are several reasons to replace coil springs: Worn or sagging springs - Weak springs lower the chassis height of a vehicle, resulting in premature tire wear and poor handling characteristics. Sagging when loaded - Vehicles used for family transportation, works trucks, or sales fleets can benefit from upgrading to Broken original springs - Although uncommon in general, certain vehicles have been known to have a very high failure rate of broken springs.

WHY use American Made Springs?

American made springs are manufactured to more exact standards and the material is far superior then that of imported spring steel with the exception of springs made in Canada. In the case of springs, you really do get what you pay for.

WHAT function do U-Bolts serve?

U-Bolts connect the axle to the leaf spring pack.

WHEN do U-Bolts need to be replaced?

We suggest that whenever the springs are removed and replaced, you should change your u-bolts at that time. It is a relatively inexpensive insurance policy to keep your vehicle is safe.

WHAT are the torque specifications for U-Bolts?

3/8" - 30 ft. lbs 7/16" - 45 ft. lbs 1/2" - 65 ft. lbs 9/16" - 95 ft. lbs 5/8" - 125 ft. lbs 3/4" - 225 ft. lbs 7/8" - 325 ft. lbs 1" - 625 ft. lbs

WHAT is the grade and strength of U-Bolts?

We use the very best L&H threaded rod to manufacture our U-Bolts. All 3/8" thru 9/16 U-Bolts are graded to meet or exceed grade 5. All 5/8" thru 1 1/4" U-Bolts are graded to meet or exceed grade 8.

WHY replace U-Bolts?

We suggest replacing the u-bolts whenever the are removed from the vehicle. U-Bolts should be replaced if they are rusted, pitted, stretched, bent, or show signs of wear.

HOW are U-bolts inspected?

Examine each U-Bolts for stress cracks, rusting, stretching, or shiny (worn) spots.

HOW do I measure U-Bolts?

Go to : http://www.springworks.com/u-bolts.html

WHAT function do bushings serve?

Bushings are used in many locations on vehicle suspension systems. Most bushings are made with synthetic rubber. However, in some cases, urethane compounds may be used. Rubber and urethane are elastomeric materials. Elastomeric refers to the natural elastic nature of rubber to allow movement of the bushing in a twisting plane. Movement is controlled by the design of the rubber element. Rubber requires no lubrication, isolates minor vibration, reduces transmitted road shock, operates noise free, and offers a large degree of bushing compliance. Urethane bushings will increase the performance handling characteristics of your vehicle. Urethane is a firmer material then rubber.

WHAT is Polyurethane (Urethane)?

Polyurethane is a term used to describe a wide ranging family of elastomers (any compound exhibiting the characteristics of natural rubber; stretchy and elastic.). Poly meaning "many" and "urethane" the classification of the chemical structure. Polyurethane or urethane for short, is used as a solid cast material (bushings). Polyurethane can be as soft as a rubber band or as hard as plastic.

WHAT is a Rubber Encased Bushing?

A Rubber Encased bushing is simply a rubber bushing encased (wrapped) in metal.

What is a Harris Bushing?

Harris bushings, also called half bushing are rubber bushings that install into an application a half at a time. Harris bushings are rubber original equipment replacement parts.

WHAT is better, Urethane or Rubber (OEM)?

Rubber is the sap of trees found mostly in tropical climates. The sap is altered by mixtures of carbon (why it's black) and mineral oils and various fillers. Polyurethane is completely chemical or man-made. Because rubber is a biodegradable product it is affected by ozone and will over time dry rot and degrade, while urethane will keep going and going. Urethane bushings will increase the performance handling characteristics of your vehicle. Urethane is a firmer material then rubber. It is more responsive then rubber. OE (Original Equipment) rubber bushings are usually softer and provide comfortable ride characteristics. Most OE bushings are rubber. Each type of bushing is suited well for the specific handling the user is attempting to achieve.

WHEN do bushings need to be replaced?

Bushing should be replaced if they are cracked, elongated, oil saturated, or worn.

HOW are bushings inspected?

Worn bushing are identified by looseness, cracks ,and off set bolts. Elongated or out of round bushings is another sign of worn bushings.

HOW will Urethane bushings affect my ride?

Urethane bushing are a harder material the stock rubber. Generally a tighter more responsive ride is noticed after Urethane is installed.

HOW is vehicle ride height measured?

There are two preferred points to measure vehicle ride height. Both measurements should be taken on a level flat surface. One is at the center of the fender well to the ground.The other is at the bump stop to the axle housing or frame.