We do all the thinking. Each kit contains all the parts needed to complete the job from start to finish so you know you’re getting all the right stuff the first time. The kits include a ring and pinion and all the bearings, seals, and small parts in one simple part number. Some kits are configured to address one axle, some cover both, and some include a Dura Grip limited-slip differential. A Yukon Pro Kit features a premium Yukon Gear & Axle gear set and uprated hardware to meet the demands of wheeling, off-road racing, track racing, street driving, and performance diesel. USA Quick Kits are affordable, general repair options when stock performance and reliability are the prime concerns.