Install both pinion bearing cups in the case using the bearing and seal installer set. Drivers are usually made of aluminum and won't hurt the bearing surface. Be careful if you use a punch, because they can damage the bearing surface and metal to metal pieces can cause flying steel pieces that can be very dangerous. A good bearing and seal driver set can be purchased from HARBOR FREIGHT, JC WHITNEY, MOST PART STORES, OR A GOOD TOOL SALESMAN and are a very reasonable price. (around $30.00) Buy a few extra bearings and seals that you have damaged and you could have paid for a driver set. They also work on axle seals, engine seals, transmission seals Etc.
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