TRANSFER CASE RESEAL KIT Transfer Case is Aluminum, Chain Driven with Electric Shift FITS FOR CHEVY TRAILBLAZER 6 CYL 4.2L 2002-ON NP126 / NP226 (aluminum cases, chain driven, electric shift), 8 CYL 5.3L 2002-ON NP126 / NP226 (aluminum cases, chain driven, electric shift), 8 CYL 6.0L 2006-2007 NP120 (aluminum cases, chain driven) FITS FOR GMC ENVOY and ENVOY XL 6 CYL 4.2L 2002-ON NP126 / NP226 (aluminum cases, chain driven), 8 CYL 5.3L 2002-ON NP126 / NP226 (aluminum cases, chain driven) Included Seals, O-Rings, Adapter Gasket