NAPA Ironclad Pricing Includes Prepaid Freight & Core Return from Servicing DC in the Contiguous 48 States. We inspect 100% of the internal components in our quality USA based facility prior to remanufacturing. Each transfer case is tested on a simulator that recreates actual driving conditions & analyzes performance, to ensure seamless engagement & leak free performance before it leave the assembly line. You can buy with confidence because each transfer case assembly is backed by guarantee warranty.