TRANSFER CASE RESEAL KIT * NP261 / NP263 * * HD * Vital Parts is offering this NEW transfer case reseal kit for the 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) With this transfer case a great way to identify what rebuild kit you need in addition to the output bearing is by the transmission it is married to. If married to either a 4L60e or a 4L80e transmission then this is the reseal kit you need.