This is a new 3" suspension lift just released from Rough Country for the 08-10 F250/F350 Super Duty . The rear will not fit the dually models, though. It is being offered by Top Gun Customz . Rough Country has released a new 3" front progressive rate leveling coil package The "Smart Coil". This is not your typical front-end leveling system, it contains progressive front coil springs which will adjust depending on what situation the vehicle is in. Progressive rate springs are the ultimate in spring design and are widely used in racing. The principle is simple. The spring rate increases when you need it (cornering, load carrying etc.) and decreases when you don't.
The science is determining desired suspension travel and spring rate during travel and Rough Country has done their job on these coils. The "Smart Coils" achieve minimal loss of ride comfort as the spring rate increases. As the spring rate decreases the shock absorber no longer struggles for rebound control and gives improved vehicle stability. The critical part of the suspension travel is from ride height to full suspension drop. The aim is to allow the spring rate to decrease smoothly back to original spring rate or as close as possible. Kit Benefits: 100% bolt-on installation.
Increased ground clearance.
Radius arm drop brackets allow for properly set caster.
Proper caster is crucial to maintaining factory handling and driveability.
Simply Awesome! Specs: Part #: 521S
Install Time: 3-4 hours
Recommended Tire Size: 35x12.50
Wheel Backspacing: Factory
Download Instructions: View
Kit Contains: Front: 3" Lifted coil springs
Extended trac bar
Radius arm drop brackets (NEW) (2) Nitro 9000 Series Shocks
Rear: Lift Block and U-bolt Kit
(2) Nitro 9000 Series Shocks
All Necessary Hardware and Detailed Instructions