3526-403A ALUMINUM WELD YOKE 1350 Series , Fits 4.000×0.083 Tube , HD T6061

3526-403A UDS 1350 Series Aluminum Weld Yoke — 4.000x0.083 Tube, T6061

The 3526-403A is a UDS 1350 series aluminum weld yoke machined from T6061 aluminum alloy, designed for 4.000-inch OD by 0.083-inch wall driveshaft tube. This yoke is welded to a cut driveshaft tube and becomes a permanent structural component of the assembled driveshaft. The 1350 series designation specifies the U-joint cap bore: 1.188-inch diameter caps fit the yoke ears. The butt diameter at the weld joint is 3.855 inches; center U-joint to weld dimension is 2.125 inches.

The aluminum T6061 construction of 3526-403A reduces rotating assembly weight compared to steel weld yokes — a direct benefit in high-performance and weight-sensitive driveshaft builds. T6061 is a heat-treated aluminum alloy with adequate yield strength for 1350 series torque capacity in the intended application range. However, aluminum weld yokes are not interchangeable with steel yokes in all applications: the weld process for aluminum (TIG, typically) differs from steel (MIG/TIG), and the thermal characteristics of aluminum require specific preparation and post-weld handling. Confirm your driveshaft fabricator has experience welding aluminum yokes to aluminum tube — welding an aluminum yoke to a steel tube is not a recommended practice. The 4.000-inch tube OD is a large-diameter tube, common in high-performance custom driveshaft builds where the larger diameter raises the critical speed threshold. The 0.083-inch wall is a standard wall thickness for 4.000-inch aluminum tubing; do not substitute 4.000x0.065 or 4.000x0.120 tube without confirming the yoke butt bore is machined to the correct OD for the wall to fully engage the weld prep.

Specifications

• Part Number: 3526-403A
• Brand: UDS
• Series: 1350
• Material: Aluminum T6061
• Tube Diameter x Wall: 4.000" x 0.083"
• Butt Diameter: 3.855"
• Center U-Joint to Weld: 2.125"
• U-Joint Cap Diameter (1350 series): 1.188"

Fitment & Installation Notes

Confirm the driveshaft tube is 4.000-inch OD by 0.083-inch wall before ordering 3526-403A. The butt bore of this yoke is machined to fit the 4.000-inch OD; a tube with a different OD will not seat concentrically in the butt bore, and any resulting eccentricity in the weld joint will cause a balance issue that cannot be fully corrected by static or dynamic balancing. The 3.855-inch butt diameter is the outer diameter of the yoke at the weld joint — this is the reference for fitup and gap measurement before welding.

The 1350 series U-joint yoke ears on 3526-403A accept 1.188-inch cap diameter U-joints in OSR (outside snap ring) retention unless otherwise specified. Confirm snap ring groove style on the mating U-joint. The 1350 series is common in 3/4-ton truck rear driveshafts, modified 4WD front driveshafts, and high-performance custom builds. Aluminum weld yokes in 1350 series are typically chosen for racing or performance builds where driveshaft weight reduction is a priority — the 3526-403A provides this while maintaining 1350 series torque capacity in the yoke geometry.

After welding, the driveshaft assembly must be dynamically balanced. Aluminum responds differently than steel during the balancing process — balance weights must be compatible with aluminum (steel weights welded to aluminum can cause galvanic corrosion at the joint over time). Confirm with your balancing facility that they can accommodate 4.000-inch aluminum driveshafts. The center U-joint to weld dimension of 2.125 inches is the distance from the U-joint cross centerline to the weld joint — verify this is compatible with your overall driveshaft length calculation before cutting the tube.

Explore related weld yoke components including 1350 series steel weld yokes and other tube OD configurations.