Get the right coilover spring rates with AccuTune Off-Road. We will calculate the correct spring rates, preload, and cross over points for your 3.75 ID Coilover Springs. We carry a large selection of rates that allows us to dial in your suspension even more. 3.75 ID Coilover springs are for 3.0 Coilovers. We are one of the largest coilover spring retailers because of our excellent service, knowledge & inventory.