Aftermarket Ford Mustang Spring Rates
and Specs
This article will help in providing spring rates and
lowering distances for various aftermarket Mustang lowering, performance and
drag springs. The spring rates of your lowering springs can be an important
factor in determining which spring will fit your Mustang's needs.
Progressive Rate vs. Linear Rate Springs - Many
customers ask what the difference is between Progressive and Linear rate
springs. A linear rate spring has a constant spring rating, no matter how
much the spring is compressed, for example 600lb/in. This means that for
every 600 pounds of pressure, there will be 1 inch of spring compression. A
progressive rate spring will have a variable spring rate, for example
425-630lb/in. This means that it may take 425 pounds for 1 inch of
compression, but as the spring compresses more it will rise to as much as
630 pounds of pressure. To put it simply, the spring "progressively" gets
stiffer as it is compressed.
Note - Spring rates are estimates
based on various independent tests. StangSuspension cannot confirm the
accuracy of these tests.
| Stock Spring Rates |
| Model/Year |
Front Spring Rate (lb/in) |
Rear Spring Rate (lb/in) |
| Mustang GT/V6 Coupe 1994-2004 |
450 (linear) |
210 (linear, solid axle) |
| Mustang GT/V6 Vert. 1994-2004 |
400 (linear) |
185 (linear, solid axle) |
| Mustang Cobra Coupe 1999-2001 |
500 (linear) |
475 (linear, IRS) |
| Mustang Cobra Coupe 2003-2004 |
600 (linear) |
600 (linear, IRS) |
| Mustang Cobra Vert. 2003-2004 |
500 (linear) |
470 (linear, IRS) |
| Mustang Mach1 Coupe 2003-2004 |
600 (linear) |
250 (linear, solid axle) |
| Mustang Bullitt Coupe 2001-20022 |
600 (linear) |
250 (linear, solid axle) |
| Aftermarket Spring
Rates |
| Manufacturer/Part Info |
Front Spring Rate (lb/in) |
Rear Spring Rate (lb/in) |
| Ford Racing B Springs (M5300B) |
425-530 (progressive) |
200-300 (progressive, solid axle) |
| Ford Racing C Springs (M5300C) |
650 (linear) |
200-300 (progressive, solid axle) |
| Ford Racing F Springs (M5300F) |
460-570 (progressive) |
170-310 (progressive, solid axle) |
| Ford Racing G Springs (M5300G) |
500-570 (progressive) |
170-310 (progressive, solid axle) |
| Eibach Pro-Kit Springs (94-04 Mustangs) |
425-530 (progressive) |
200-300 (progressive, solid axle) |
| Eibach Sportline Springs (79-04 Mustangs) |
425-630 (progressive) |
140-295 (progressive, solid axle) |
| H&R Sport Springs (94-04 Mustangs) |
490-575 (progressive) |
205-250 (progressive, solid axle) |
| H&R Sport Springs (99-04 Cobra) |
700-760 (progressive) |
685 (linear, IRS) |
| H&R Super Sport Springs (94-04 Mustangs) |
700-760 (progressive) |
275-300 (progressive, solid axle) |
| H&R Race Springs (79-04 Mustangs) |
750-850 (progressive) |
260-280 (progressive, solid axle) |
| H&R Race Springs (99-04 Cobra) |
750-850 (progressive) |
770 (linear, IRS) |
| Steeda Sport Springs (79-04 Mustangs) |
650 (linear) |
200-250 (progressive, solid axle) |
| Steeda Sport Springs (03-04 Cobra) |
720-780 (progressive) |
650-790 (progressive, IRS) |
| Steeda Competition Springs (79-04 Mustangs) |
750-850 (progressive) |
250 (linear, solid axle) |
| StangSuspension Springs (94-04 Mustangs) |
490-575 (progressive) |
205-250 (progressive, solid axle) |
Please feel free to e-mail
sales@stangsuspension.com or
call 877-272-5670 if you have more questions!
Sincerely,
Josh Sadowsky
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