Superior part number 18-9001.
Rear Twist In Coil Spring Boosters, 4 per card installed 2 per coil spring. A light hammer traps the unit between coils and a wrench is used to screw in the unit to obtain
increased tension.

Application Guide:

Rear coil spring spacer provides 1" up to 1-1/2" max. lift to rear coil springs.
Install 45 degrees a part, 2 per coil spring. 4 included for 2 coil springs
Read instructions carefully before installing.
Do not over-extend your existing coil springs past their normal rate of tension as this could be permanent.

Free Shipping is for continental USA only. If you live in Alaska, Hawaii, or PR please contact us for a shipping quote before bidding.

All items are sold as shown. Since we offer free shipping we will ship the items the cheapest most cost effective way possible.