3580-45 – 45 – Center Support Bearing – Lincoln Navigator Application – 1.574″ ID

Q: How does 3580-45 differ from 3580-50 for the Lincoln Navigator? A: Both SKUs share the 1.574" bore and Navigator application, but the mount-to-base dimension differs. Always measure the center-to-base height of your existing bracket before selecting a replacement -- installing a unit with the wrong height changes the driveshaft operating angle and introduces vibration.

Q: My Navigator has a grinding noise from the underside at low speeds. Could this be the center support bearing? A: Grinding (as opposed to rumbling or howling) at low speed typically indicates the ball bearing inner race has spun on the stub shaft journal, causing metal-to-metal contact. Remove the driveshaft, inspect the stub shaft for a bright wear band at the bearing seat, and measure the OD. If it has spun, replace the stub shaft section along with the 3580-45 bearing assembly.

Q: What torque spec applies to the hanger bracket bolts? A: Ford/Lincoln specifies the center bearing bracket fasteners at approximately 26 ft-lb (35 Nm) for Navigator applications, though always verify against the factory service manual for your model year. Under-torquing allows the bracket to pivot and load the bearing asymmetrically.