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Q:how much lift does each spacer give the spring and how many spacers are needed per spring
A:Hi 450slc, happy to help you! The AutoCraft Twist-In Rear Coil Spring Boosters (4-Pack) (Part No. AC189001/18-900) will lift up to 1-1/2 inches and you will need 2 spacers per spring.
Q:how do you install the twistin real coil spring boosters so they dont fall off. Does car needed to be on LIFT etc
A:Hi Shopper, good question! To install the twistin real coil spring boosters jack up the car, remove the wheels and screw them into the widest gap of the coil spring wire with a deep-well socket and a breaker bar. For help with your project, I would recommend purchasing a Chilton or Haynes Repair Manual for your vehicle, not only will it explain how to replace this part, but you'll find it handy for many more projects on your vehicle.
Q:is this part meant to be installed into old coil springs to lift rear of car
A:This Superior 18-9001 Twist In Rear Coil Spacer - part# 18-9001 helps restore spring tension. Helps restore life to sagging coil springs. Provides lift to sagging springs. Increases spring tension to help prevent bottoming.