Gen 3 Vortec Harness Gen 3 Vortec Harness; Extra Length; EMC/PMC Service #s 12200100 Or 9354896; Controlled 4L60E Or 6 Speed Transmissions CHEVROLET AVALANCHE 1500 SILVERADO 1500 SILVERADO 1500 HD SILVERADO 2500 SILVERADO 2500 HD SILVERADO 3500 SSR SUBURBAN 1500 SUBURBAN 2500 TAHOE TRAILBLAZER TRAILBLAZER EXT BASE LS LT LTZ NORTH FACE ON ROAD EDITION SS WBH WT Z66 Z71 1999 2000 2001 2002 2003 2004 2005 2006 4.2L LL8 Vortec (256) 4.3L (262) Vortec 4.8L GEN III LR4 Vortec (294) 5.3L GEN III Flex L59 Vortec (325) 5.3L GEN III L33 Vortec (325) 5.3L GEN III LM4 Vortec (323) 5.3L GEN III LM4 Vortec (325) 5.3L GEN III LM7 Vortec (325) 5.3L GEN IV LH6 Vortec (323) 5.3L GEN IV LH6 Vortec (325) 5.7L L31 (350) Vortec 6L GEN III CNG LQ4 Vortec (364) 6L GEN III LQ4 Vortec (364) 6L GEN III LQ9 HO Vortec (364) CNG FLEX GAS Painless Wiring Painless Wiring Gen 3 Vortec Harness - 60218 60218 Engine Wiring Harness