PCM Service Numbers
1996-7 Vortec 4.3L,5.7L,7.4L use 16244210,16229684,16208546
1998-2000 Vortec 4.3L,5.7L,7.4L use 9368610,16263494,16250279
1999-2000 LS1 Trucks 4.8L,5.3L,6.0L use 9354896
2001-2002 LS1 Trucks 4.8L,5.3L,6.0L use 12200411
2003-2005 LS1 Trucks 4.8L,5.3L,6.0L use 12582605,12586242,12586243,12576106