Id suggest you specify your question a bit more briefly. Meaning Front coil springs? suspension springs? door handle springs?
coilover or lowering springs or air suspension
Get new springs made.
First of all, they aren't springs, they're suspension, and second of all, if you don't have suspension on your car then the car will get damaged internally and the ride would be very bumpy and uncomfortable. So, your car really needs its "springs."
Lowering the springs of a car will cause the tires to bounce.
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There is no set time or mileage when to replace automotive springs. It would be when springs are fatigued, cracked or broken. At that point the springs should be replaced in pairs.
The springs in the suspension hold tension.
A truck's suspension (springs and shock absorbers) is much stiffer than a car's. Small bumps in the road, which are absorbed by a car's suspension, are transmitted to a truck's driver.
Shorter springs would be one way to lower a car. Weak springs would be another way.
the best way to lower a car is with a drop spindel
SVE parts is teh brand sold in house by Late Model Restoration. LRS Buys the springs from someone else and resells them as their own brand. For the Mustang the springs are constant rate and are rated at 450lb/in for front springs and 250lbs/in for rear springs. These might be on light side or a aggressively driven V8 Mustang but would do very well on a 4cyl or V6 car. If the car is being built with handling in mind specific rate springs are a better choice than variable rate springs for events requiring good precise handling such as Autocross. Since the springs are advertised with a 2in drop caster camber plates are a must. A 4cyl or 6cyl car will not drop 2in as they do not usually have as much weight over the front axles.
Approx 70 - 90 miles, depending specifically on where in Denver and where in Colorado Springs.