3680-90 – 90 – Center Support Bearing – 1.181″ ID – 3.250″ Center Bearing To Base

3680-90 Specifications
Bore ID: 1.181" (30 mm)  |  Center to Base: 3.250"  |  Type: Rubber-isolated center support bearing

The 3680-90 uses a tall 3.250" center-to-base bracket with a 30 mm bore -- the same height as the 9980-10 but with a different bracket profile under the 3680 series designation. The distinction between the 3680-90 and 9980-10 for a given application is bracket geometry, not dimensions; always confirm via the OEM part number from the removed unit.

This tall height requires careful attention to the crossmember mounting torque sequence. When the bracket has been installed finger-tight, the driveshaft will naturally pull the bracket to its loaded position. Only torque the fasteners to spec after the driveshaft is fully assembled and hanging under its own weight -- pre-torquing with the driveshaft absent pre-loads the rubber isolator in a position that changes once the driveshaft weight is applied, leading to a permanently offset bearing position. Spicer and Dana cross-references for this geometry exist in the 2-26 series; confirm by application.