3680-43 – Center Support Bearing – Gm Application – 1.378″ ID – 1.375″ Center Bearing To Base

Q: Why is the 3680-43 center-to-base height only 1.375" when most GM units are 2.250" or taller? A: GM used a low-profile hanger bracket on certain models where the frame crossmember sits close to the driveshaft centerline. The 1.375" height matches those applications exactly. Substituting a 2.250" unit forces the stub shaft upward at an angle that causes the center support bearing housing to bind against the crossmember.

Q: How do I verify 1.375" is the correct height for my vehicle? A: With the driveshaft removed, measure the distance from the crossmember bracket mounting face (or center of the bracket slot) to the centerline of the stub shaft bore position. That measurement should match the center-to-base dimension of the replacement bearing assembly within 0.050".

Q: What GM models use the 3680-43? A: The 3680-43 is used on several GM platform applications with 35 mm stub shaft journals. Bore ID is 1.378". GM OEM cross-references include numbers in the 22800834 and related families -- confirm against your VIN or chassis code for the exact model year and trim level.