Speedway Motors Mustang II Front Coil Springs 400 lb Spring Rate 13.5 Inch Free Height 3.5 Inch ID Compatible with 74–78 Mustang II 74–80 Pinto Bobcat Suspension

Our Compatible with Mustang II springs come in rates from 275 thru 425 and in 13.5” free height/length. They will require cutting to the necessary length on the majority of applications. For the heavier vehicles such as full size pickup trucks and fat fendered cars the spring rate used will normally be in the 350-400 range. With Small Block and automatic a common rate is 375 to 400 and with the addition of A/C or a big block you will need to compensate for the additional weight and go to the next higher rate. FCompatible with Rame boxing and plating, accessories, and fuel tank size all play a part in selecting spring rate. When vehicle is sitting at ride height ready for test drive the lower control arms should be parallel with the ground or pointing down at a slight angle on the outer ends. The springs will settle some in the first couple of hundred miles so allowance for this should be made. Powder coated gloss black. 13.5" spring length. 3.50" inside diameter. Use the spring chart below to select proper rate. Use the following chart to select your rate: 1200 lb. Front End Weight = 275 Rate Spring. 1300 lb. Front End Weight = 300 Rate Spring. 1400 lb. Front End Weight = 325 Rate Spring. 1500 lb. Front End Weight = 350 Rate Spring. 1600 lb. Front End Weight = 375 Rate Spring. 1700 lb. Front End Weight = 400 Rate Spring. 1800 lb. Front End Weight = 425 Rate Spring.

• Compatible with Mustang II Suspension Fitment: Designed to fit 1974–1978 Compatible with Mustang II, 1974–1980 Pinto, and 1975–1980 Bobcat front suspension systems
• 400 lb Spring Rate: Ideal for heavier front-end setups, providing controlled ride height and balanced handling performance
• OEM Specification Dimensions: Built with a 3.5" inside diameter and 13.5" free height to match factory-style spring geometry
• Durable Powder Coated Finish: Gloss black powder coating enhances long-term durability and maintains a clean appearance
• Precision Spring Ends: Square upper end ensures proper seating in the upper hat, while the pigtail lower end allows trimming for fine ride-height adjustment