TRANSFER CASE RESEAL KIT * NP261 / NP263 * * HD * Vital Parts is offering this NEW transfer case reseal kit for the compatible Chevrolet, GMC applications equipped with either NP261 or NP263 HD. This transfer case is aluminum and chain driven, has a 32-Spline output shaft and 24MM wide output bearing. Please see the detailed description below for your specific model. As always if you are unsure of specific fitment please send us a message and we would be happy to help! Chevrolet GMC: (Full Size) 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 (aluminum cases, chain driven)