3R80-30 – Center Support Bearing – Gm Application – 1.574″ ID – 625″ Center Bearing To Base

3R80-30 -- GM Center Support Bearing, Extremely Low Profile at 0.625 Inch

The 3R80-30 stands apart from nearly every other center support bearing in the catalog by its center-to-base height: 0.625 inches. For comparison, most Ford and Dodge CSBs run between 1.500 and 3.250 inches. This minimal height is not a manufacturing variation -- it is a deliberate specification for GM applications where tunnel geometry places the driveshaft very close to the mounting surface, requiring the bearing to sit nearly flush with the bracket.

Installing a taller bearing in a 3R80-30 application creates immediate contact between the bearing housing and the transmission tunnel, or forces the driveshaft into an incorrect angular alignment that loads the adjacent U-joints beyond their operating range. If you are replacing a bearing on a GM two-piece shaft setup and the original unit appears unusually shallow, confirm the 0.625-inch center-to-base dimension before sourcing a replacement.

• SKU: 3R80-30
• Application: GM
• Inner Bore: 1.574 inches
• Center-to-Base Height: 0.625 inches -- verify this is correct for your application

The 1.574-inch bore is consistent with 1350/1410-series GM stub shafts. Measure the stub shaft OD before pressing to confirm clearance. A correctly fitted center support bearing at this height should sit flat in the bracket with the rubber isolator fully captured and the bearing housing centered with no contact against the bracket sides.

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