New high strength extended steering knuckles for use with 20"+ rims retain factory steering geometry and improve ride handling and steering; 3/16" thick steel front lower crossmembers and differential skid plate add strength to chassis and protection for front differential; Upper strut spacers retain the factory-tuned struts for same-as-factory ride quality; Rear lift blocks U-bolts and Pro Runner shocks provide level stance and maintain factory load capacity; DOES NOT FIT REAR MONO LEAF EQUIPPED TRUCKS; DOES NOT FIT TRAILBOSS ARC ZR2 AT4 & AT4X MODELS.; California Residents: WARNING