If your machine is making whining sounds or not entering gear correctly, then it's a good idea to check your differential and transmission for wear and damage. If you need to rebuild your differential, then you're in luck! This all-in-one kit contains all the bearings and seals you need to rebuild one differential. All Balls products are trusted by everyone from professional pilots to amateur bikers for their astounding quality and performance, and when you buy this Differential Bearings and Seals Kit you'll understand why.