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Global West highly recommends linear rate springs (also known as constant rate) over variable; not that variable rate springs are bad, but linear rate springs provide the best performance for our customers. Here are reasons why we prefer linear rate verses variable:Consistency As a linear is compressed, the resistance increases per inch equal to that of the rate. For example, if a spring is rated at 300 pounds per inch, for every inch of travel the spring compresses, the resistance increases 300 pounds. Therefore, one-inch of compression will provide 300 pounds of resistance, two-inches 600 pounds, and three-inch 900 pounds. Variable rate springs, however, do not increase in the same fashion. The are generally rated with a lower spring rate on initial, and build to the desired rate. Example: The first one-inch of travel might start out as 250 pounds per inch, the second-inch 560, and the third 900. For a driver who is looking to improve their driving skills, a vehicle must give predictable feed-back each time during cornering and trail braking. A linear spring will do that because the rate is consistent.Less chance of bottoming-Lowered cars always have reduced suspension travel. The lower you go the less travel is available. Variable rate springs tend to allow more travel before the spring can build rate, keeping the suspension from bottoming. The question is: Is there enough suspension travel available while the spring builds enough resistance (rate) before bottoming occurs?Variable rate springs tend to over emphasize the geometry curve giving us more tire movement than necessary.Chassis diagnostics is difficult.Lowered SpringsOur springs generally lower the vehicle one-inch in the front and up to 1-1/4 inches in the rear depending on the option for your vehicle. Why we only lower about one-inch in the front is simple, there is not enough suspension travel beyond one-inch for street applications. We admit, vehicles lowered one-inch look great, but they generally run into suspension bottoming problems. Header to ground clearances tend to be another issue. Therefore, in our experience, we believe one-inch makes the most sense especially if the care is driven on the street.Experience Unmatched Performance with 1967-1972 GM A-body Rear Coil SpringsAt Global West, we are committed to delivering top-notch quality and performance with our 1967-1972 GM A-body Rear Coil Springs. These springs are meticulously designed to provide a 1/2 drop, enhancing the overall stance and handling of your classic American muscle car. Crafted with precision, these springs offer a linear rate for consistent resistance, ensuring predictable feedback during cornering and trail braking. This makes them an ideal choice for models like the Buick Skylark, Chevrolet Chevelle, Oldsmobile Cutlass, and Pontiac GTO.Our springs are not just about performance, they are about durability too. Made from high-quality materials, they are designed to withstand the rigors of performance driving, reducing the chances of bottoming out even in lowered cars. We understand that every classic car restoration or upgrade project is unique, and we are here to support you every step of the way. Our comprehensiveDIY instructionsandvideo tutorialsare designed to guide you through the installation process. And if you need further assistance, our dedicated customer support team is always ready to help.So, whether youre a seasoned restorer or a first-time DIYer, trust Global West for the best suspension components for your American classic. Explore more options for your Buick on ourBuick Parts Onlinecategory, or delve into specific parts for your 1964-1972 Buick with ourBuick 1964-1972 Partsselection. For a more focused search, check out ourBuick Skylark Suspension Partscategory. Discover the Global West difference today!