Abstract: An improved structure supports a bearing in a bore provided in a portion of a transmission case and prevents relative rotation therebetween. In a preferred embodiment, the clutch housing portion of a transmission case is made from aluminum and includes an interior wall having a bore formed therein. A circumferential groove is formed in the side wall of the bore, and a compressible or elastomeric O-ring is disposed in the groove. A bearing is made from steel and includes an inner race, an outer race, and a plurality of rollers disposed between the races. As the bearing is pressed into the bore, the O-ring is compressed completely within the groove. So long as both the aluminum clutch housing and the steel outer race of the bearing remain in a relatively cold condition, the outer race will frictionally engage the inner surface of the bore, thus preventing any relative rotational movement therebetween.