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You should upgrade your shocks every 50,000 miles
When to Replace or Change Leaf Springs
Replace Leaf Springs
Leaf Springs Are Probably Okay
Look Into Air Lift or Helper Springs
Q: How do I know if my leaf springs are worn out?
Should I replace my leaf springs? It's hard to always know when the right time is. Some of the more obvious symptoms are a cracked leaf or the rear of the truck in a constant sagging position (lower in rear). But some less apparent indications can actually be a leveled truck that has not had a leveling kit installed. Really? A level truck can mean a worn leaf spring? Yes, because most pickup trucks are actually slightly raised about 1.5 – 2.5 inches in the rear which gives a “nose down” affect. The reason manufacturers set the vehicle this way is to accommodate for weight or load on the rear of the truck so your lights are not pointing at the sky and blinding on-coming traffic. So if your vehicles level, that may indicate your springs are not sitting at the height they were intended to due to fatigue and wear.
So what if I just used an add a leaf kit or installed a helper spring like a Firestone air bag, Hellwig helper spring or Timbren kit? It may or may not help your situation and it is not recommended because it will essentially just be masking the problem. Adding a leaf will work… temporarily. Eventually, in the near future, that single leaf will most likely lose its strength as the other s aren’t going be helping out too much. A leaf pack is intended to work together, so that’s just a quick fix, not a solution.
As for helper springs; they are a great addition - but only after you replace the leaf spring! A helper spring is intended to do just as the name states, help a spring, but a healthy spring. You must have a good leaf spring because the vehicle is not designed to rely on helper springs which are not designed to be the "primary" suspension of the vehicle.