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Q:I am looking for a stiffer spring for my 1976 Ford Mustang II, I'm told the Thunderbird springs are the same size but stiffer, any suggestions
A:The Moog Coil Spring Set (Part No. 8556) is an exact fit for your 1976 Ford Mustang II but it does not fit Thunderbird. Product Features: Powder coated to protect against corrosion, which can cause coil spring fatigue or fracture. Designed to lower stresses for longer service life. All coil springs are 100% load tested. Worn or sagging coil springs can cause premature tire wear due to vehicle misalignment. For more information, please feel free to call us at 1-877-238-2623 or visit your nearest Advance Auto Parts store and one of our technicians would be more than happy to
Q:What is the free length?
A:The specification of this part Moog Coil Spring, part number 8556 :End 1 Type: Square, End 2 Type:Tangential, Inside Diameter:3.500, Bar Diameter:0.593, Install Height:9.50, Load:1561, Spring Rate:364, Free Height:13.81.
Q:what is the spring rate
A:The spring rate of the part Moog Coil Spring, part number 8556 manufactured by Moog is 364.