Application: 1999-2018 Silverado 1500, Split Mono Leaf Spring / Caltrac Traction Bar Combo
Leaf Spring Stance: Stock Ride Height, 340-46
Traction Bars: 3400 No flip kit, 3404 Fits flip kits
 
Put the power to the pavement with Calvert split mono leaf springs and Caltrac traction bars. Have questions about ride height, Low Pro/Standard pivot plates, or shocks? Contact us at Redbird. 
 
Tested on the fastest stock suspension cars in the world, Calvert’s Split Mono Leafsprings are designed to control and reduce excessive body separation in rear suspension and plants the rear tires without unloading.
 
Parabolic rear half design distributes the main spring pressure point through the length of the half, reducing spring breakage.
 
All of Calvert Racing’s 2.5″ wide Split Mono Leafsprings are assembled to order with grade 8 hardware and heavy-duty alignment clamps. Aluminum bushings are pressed into the front spring eyes and polyurethane bushings in the rear spring eyes, these springs have been proven to withstand over 2,500 HP at ¼ mile ETs in the 6s.
 
3400 Caltracs (No flip kit):
Designed especially for trucks, axle BELOW springs. Bolt On traction system. Full pre-load adjustability, keeps axle from rotating/maintains pinion angle, eliminates spring wrap up, improves 60′ times. Black powder coated. Berlin-style pivot plates for most applications.
 
3404 Caltracs (For use with flip kits):
1999-2019 Chevrolet Silverado C1500 (flipped)
1999-2017 GMC Sierra C1500 (flipped)
Designed especially for trucks. Bolt On traction system. Full pre-load adjustability, keeps axle from rotating/maintains pinion angle, eliminates spring wrap up, improves 60′ times. Black powder coated. Berlin-style pivot plates for most applications.
 
Made in USA.
 
These springs are designed for DRAG RACING and have a higher spring rate / stiffer ride than stock springs. Spring halves are painted black before assembly, but some raw steel may show due to deburring/grinding sharp edges.
 
These springs are not intended for hauling or towing.