TRANSFER CASE SPROCKET AND CHAIN KIT. Fits all NP149 & NP246 verisons but only fits the NP261 & NP263 that have 38 spline inner pump gear. Does NOT fit any of the XHD models. Kit Contains: (1) HV-072 Chain is 1.25" wide 98 pitches 49 Links (3 Blue Links). (2) 401805 Sprockets for 1.25" wide chain / 47T 55 splines 5.38" OD 2.38" I.D. (Drive & Driven are identical). Fits For Chevy GMC: 1500, 2500, 3500 (Silverado, Sierra): 8 CYL 6.0L 2001 - ON NP261 / NP263 (aluminum cases, chain driven), 8 CYL 8.1L 2001 - ON NP261 / NP263, 6 CYL 4.3L 1998 - 2007 NP 246 (aluminum cases, chain driven, electric shift), 8 CYL 4.8L 1999 - 2007 NP 246, 8 CYL 5.0L 1996 - 1998 NP 246, 8 CYL 5.3L 1999 - 2007 NP 246, 8 CYL 5.7L 1998 - 1999 NP 246, 8 CYL 6.0L 1999 - ON NP 246, 8 CYL 7.4L 1998 - ON NP 246. Fits For Cadillac Escalade, Escalade EXT: 8 CYL 5.7L 1999 - 2000 NP 246 (aluminum cases, chain driven). Fits For Chevy Avalanche 1500, 2500: 8 CYL 5.3L 2002 - 2007 NP 246 (aluminum cases, chain driven), 8 CYL 8.1L 2001 - 2006 NP 246. Trailblazer: 6 CYL 4.2L 2002 - ON NP 226 (aluminum cases, chain driven, electric shift), 8 CYL 5.3L 2002 - ON NP 226. Blazer, Suburban, Tahoe: 8 CYL 5.0L 1998 - 1999 NP 246 (aluminum cases, chain driven, electric shift), 8 CYL 5.3L 1999 - 2006 NP 246, 8 CYL 5.7L 1998 - 1999 NP 246, 8 CYL 6.0L 1999 - 2006 NP 246, 8 CYL 7.4L 1998 - 2000 NP 246, 8 CYL 8.1L 2001 - 2006 NP 246.