Part No. DSS-1810EYC51 Heavy Duty 1810 Series Driveshaft Center U-Joint To Center Bearing = 51" - Open u-joint to Midship End Yoke, Certified Driveshaft - OEM SPICER

DSS-1810EYC51 OEM Spicer 1810 Series Midship Driveshaft — 51" CL-to-Center Bearing

The DSS-1810EYC51 is an OEM Spicer 1810 series certified driveshaft section in open U-joint to midship end yoke configuration, with a center U-joint to center bearing dimension of 51 inches. This assembly forms the front section of a two-piece driveshaft: the open U-joint connects at the transmission or transfer case output shaft, and the midship end yoke seats at the frame-mounted center support bearing. The 1810 series specifies a 1.875-inch U-joint cap diameter throughout — all connecting yokes must be bored to this dimension.

At 51 inches, the DSS-1810EYC51 is among the longer midship sections in the 1810 series line and is suited for long-wheelbase commercial truck configurations where the two-piece driveshaft geometry requires substantial front-section length. Critical speed is an engineering consideration at this length: the tube diameter, wall thickness, and material specification of an OEM Spicer Certified assembly are selected to maintain adequate critical speed margin for standard commercial operating RPMs, but any aftermarket modifications that increase maximum vehicle speed or change final drive gearing must be evaluated against the specific critical speed rating. The 1810 series sits above the 1710 series in Spicer's torque capacity hierarchy and is standard in heavy commercial Class 6–7 drivetrain applications.

Specifications

• Part Number: DSS-1810EYC51
• Brand: OEM Spicer
• Series: 1810
• CL to Center Bearing: 51"
• U-Joint Cap Diameter (1810 series): 1.875"
• Configuration: Open U-joint to Midship End Yoke
• Assembly Type: Certified Driveshaft

Fitment & Installation Notes

Measure the distance from the front U-joint centerline to the frame bracket bearing centerline at ride height before ordering DSS-1810EYC51. Confirm all mating components — rear driveshaft section, connecting yokes, center support bearing — are 1810 series rated. The midship stub shaft OD must match the center support bearing inner bore exactly. A stub shaft with 0.002 inches of clearance in the bearing bore will allow the shaft to orbit at operating speed, causing vibration and fretting of the bearing race.

On long-wheelbase trucks, the two-piece driveshaft design divides the total shaft length at an intermediate support point to keep each section below its critical speed. The 51-inch midship section combined with the rear section must be evaluated as a system — both sections must operate below their respective critical speeds at maximum vehicle speed. Confirm with your drivetrain engineer or refer to Spicer application data if operating near the design speed limit.

Install DSS-1810EYC51 with yoke ears in phase at both U-joint ends. Torque center support bearing mounting hardware to specification. Verify rear driveshaft section length and series before completing installation. Recheck driveshaft angles after installation and at full suspension droop to confirm operating angles remain within the 1810 series U-joint angle rating.

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