New ReTech® Transfer Case Applications. When the mud is deep and winter’s wrath hits hard, you rely on your all-wheel drive (AWD) or four-wheel drive (4WD) vehicle to get you safely home. When it’s time to service or replace your transfer case unit, rely on ReTech.; UMC ReTech’s premium line of ReTech remanufactured transfer case products restores the performance of your 4WD or AWD system. We inspect 100% of the internal components in our ISO9001 USA based facility prior to remanufacturing. Each transfer case is tested on a simulator that recreates actual driving conditions and analyzes performance, to ensure seamless engagement and leak free performance before it leave the assembly line. You can buy with confidence because each transfer case assembly is backed by UMC ReTech’s 12 month / 12,000 mile warranty.