USA standard Master Overhaul kit for the Model 35 IFS front differential. USA Standard Gear Master Overhaul Kits provide all of the necessary parts for a differential overhaul in one simple part number. Save time and money, and get the exact parts you need for your specific installation.. USA Standard Gear Master Overhaul Kits give you all the high-quality installation parts you need to start and finish every differential job. USA Standard Gear offers more tailor-made kits than any other manufacturer in the industry to meet your specific installation needs. This kit uses high-quality Koyo/Timken bearings and races along with high quality seals and small parts. USA Standard Gear Master Overhaul Kits are the most comprehensive and complete kits on the market because USA Standard Gear does extensive research to ensure that every kit has everything you need for your application.