3680-35 – Center Support Bearing – Gm Application – 1.181″ ID – 1.125″ Center Bearing To Base

Q: Is the 3680-35 correct for a Chevy Silverado with a two-piece driveshaft? A: The Silverado fullsize 4WD typically uses a 1.574" (40 mm) or 1.378" (35 mm) bore center bearing, not the 1.181" (30 mm) bore of the 3680-35. The 30 mm bore is more common in GM compact and mid-size platforms. Verify the stub shaft OD with a micrometer -- if it measures 30 mm, the 3680-35 may apply, but confirm the bracket height (1.125") matches your vehicle.

Q: What GM models typically use a 1.125" center-to-base center support bearing? A: The 1.125" height is found on GM passenger car and compact crossover driveshaft configurations where the crossmember bracket sits close to the propshaft centerline. Specific models include certain Cadillac, Pontiac, and compact GM truck variants. Confirm via GM OEM part numbers -- numbers in the 22800834, 12472372, and 88951975 families cover various GM center bearing applications.

Q: My GM vehicle shakes at 70 mph. How do I determine if the center bearing is the cause? A: Place the vehicle on a lift at idle and observe the driveshaft at low RPM. A worn center bearing often shows visible wobble or side movement at the center joint section. Alternatively, grip the driveshaft and feel for radial play at the center bearing location with the vehicle supported -- any perceptible radial play confirms replacement is needed.