Work-Rite(R) Air Helper Spring Kit Work-Rite(R); Air Helper Spring Kit; Front; Incl. Brackets; Load Assist Springs; Hardware; No Drilling Required; OEM Number W277608629 CHEVROLET GMC SIERRA 1500 SIERRA 1500 HD SIERRA 2500 SIERRA 2500 HD SIERRA 2500 HD CLASSIC SIERRA 3500 SIERRA 3500 CLASSIC SIERRA 3500 HD SILVERADO 1500 SILVERADO 1500 HD SILVERADO 2500 SILVERADO 2500 HD SILVERADO 2500 HD CLASSIC SILVERADO 3500 SILVERADO 3500 CLASSIC SILVERADO 3500 HD SUBURBAN 2500 YUKON XL 2500 BASE CLASSIC LS CLASSIC LT CLASSIC SL CLASSIC SLE CLASSIC SLT CLASSIC WT HT HYBRID LS LT LTZ SL SLE SLT SS WT 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 4.3L (262) Vortec 4.3L L35 (262) Vortec 4.3L LU3 (262) Vortec 4.8L GEN III LR4 Vortec (294) 5.3L GEN III Electric/Gas LM7 (325) 5.3L GEN III Flex L59 Vortec (325) 5.3L GEN III L33 Vortec (325) 5.3L GEN III LM7 Vortec (325) 6.6L Duramax Turbo Diesel LB7 (403) 6.6L Duramax Turbo Diesel LBZ (403) 6.6L Duramax Turbo Diesel LLY (403) 6.6L Duramax Turbo Diesel LMM (403) 6L GEN III Bi-Fuel LQ4 Vortec (364) 6L GEN III CNG LQ4 Vortec (364) 6L GEN III LQ4 Vortec (364) 6L GEN III LQ9 HO Vortec (364) 6L GEN IV Flex L96 Vortec (364) 6L GEN IV LY6 Vortec (364) 8.1L L18 Vortec (496) BI-FUEL CNG DIESEL ELECTRIC/GAS FLEX GAS Firestone Ride-Rite Firestone Ride-Rite Work-Rite Air Helper Spring Kit - 8629 8629 Suspension Load Leveling Kit