I'm not ral familiar with the Sienna, but it's one of two types. 1st generation hub bearings require removal of the hub then removal of the bearing which can be done on-the-car with a Hub Shark (costly tool) or off-the-car with a shop press (knuckle removed) therefore usually requiring an alignment. Machine shops can press them in and out. The second type is the 2nd generation in which the hub and bearing are replaced as an assembly which is bolted into the knuckle. These are usually easier to replace. Look for three or four bolts on the back side of the knuckle to find out which type you have. Gerard
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