40134461 Center Support Bearing GM APP 2014+ , Bearing ID: 1.378 Center Mounting Holes: 6.625 Bracket Wide: 1.850

40134461 Center Support Bearing — GM 2014+ Application, 1.378" Bore, Enclosed Bracket with M10-1.5 Studs

The 40134461 is a center support bearing assembly catalogued for Chevrolet and GMC applications, model year 2014 and newer. In a two-piece driveshaft layout, the midship stub shaft passes through the 1.378-inch bore and the entire assembly bolts rigidly to the vehicle crossmember or frame bracket; the rubber isolator absorbs rotational vibration and accommodates the slight angular excursion that occurs as the driveshaft flexes under load. The 40134461 uses an enclosed bracket design mounted via M10-1.5 threaded studs rather than through-bolts, which governs the hardware required at installation.

The bearing inner diameter of 1.378 inches (nominally 35 mm) must match the outer diameter of the midship stub shaft precisely. Even 0.5 mm of clearance produces the harmonic vibration — typically felt as a 30–50 mph resonance that shifts with vehicle load — that is the primary symptom of a worn or mismatched center support bearing. The mounting hole center-to-center spacing is 6.625 inches, matching the GM 2014+ platform crossmember bracket geometry; earlier GMT900-generation trucks used a different hole spacing and the 40134461 is not a dimensional match for those applications. The center-to-base height of 1.850 inches is the vertical distance from the bearing centerline to the mounting face; this dimension establishes driveshaft working angles and must match the OEM specification — a bearing that sits 0.100 inches too high or too low alters the U-joint operating angles on both sections of the two-piece assembly. The enclosed bracket design houses the rubber isolator and bearing within a steel shell, providing structural protection against road debris and maintaining the isolator in compression as designed. Stud thread specification is M10-1.5, requiring M10-1.5 flange nuts; do not use standard hex nuts without a flange face on these stud mounts.

Specifications

• Part Number: 40134461
• Application: GM — Chevrolet, GMC 2014+
• Bearing Inner Diameter (ID): 1.378"
• Center-to-Base Height (CL to mounting face): 1.850"
• Mounting Hole Center-to-Center Spacing: 6.625"
• Bracket Type: Enclosed type
• Mounting Hardware: Studs, M10-1.5 thread

Fitment & Installation Notes

Before ordering the 40134461, measure the outer diameter of the midship stub shaft. The 1.378-inch bore is non-negotiable; confirm this matches the shaft OD. Next, verify the frame crossmember bracket hole spacing on the vehicle is 6.625 inches center-to-center — the 2014+ specification for the platforms this bearing covers — not the older spacing used on GMT900 or GMT400 applications. The M10-1.5 stud configuration means the bracket studs thread through the crossmember bracket and are secured with flange nuts; do not attempt through-bolt conversion.

When replacing the 40134461, simultaneously inspect the midship stub shaft for surface scoring or corrosion in the bearing contact zone, and inspect the rubber isolator for cracking, oil contamination, or collapse. A degraded isolator allows metal-to-metal contact at the bracket and will destroy a new bearing within a short service interval. Torque the M10-1.5 flange nuts to the GM-specified value for this platform; over-torquing compresses the rubber element and shifts the natural frequency of the isolator, reducing its vibration-damping effectiveness. No cross-reference to a Spicer, Neapco, or Meritor catalog number was identified in available data for this GM-specific assembly; verify all dimensions against the vehicle before substituting an alternative bearing.

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