Revolution Gear and Axle Upgraded 4340 Chromoly Heavy Duty U-Joints. 1350 Series u-joints can replace the 5-7166X U-Joint. These are Needle Bearing style U-Joints eliminating routine maintenance, ships with full circle snap rings. Commonly used in Revolution Gear and Axle Jeep Front Axle Kits with Larger U-Joints (Axle Kit SKUs ending in -HD). This part number includes Qty1 U-Joint.