RABROPAR steering shaft universal joint 3/4in 36-spline to 3/4in Double-D, chrome 3.25in compact coupling

RABROPAR's 3/4" 36-spline to 3/4" double-D steering shaft universal joint is a compact, chrome-plated coupling designed to connect mismatched steering and drive components reliably.

This precision universal joint (3-1/4" overall length) pairs a 36-spline 3/4" bore on one side with a 3/4" double-D bore on the other, offering a corrosion-resistant alloy-steel construction and a maximum operating speed of 4000 rpm. Built for demanding mechanical linkages, it brings a durable, low-maintenance connection to custom steering shafts, rock crawlers, street rods and industrial equipment that require a short, high-strength coupling.

How does this U-joint fit my steering setup?

Fit depends on matching the bore type and diameter: one end is a 3/4" spline (36 teeth) and the opposite end is a 3/4" double-D. Confirm your shaft ends match those configurations before ordering to ensure a secure press or clamp fit.

• 36-spline side: 3/4" maximum inner spline diameter
• Double-D side: 3/4" maximum D-profile bore
• Overall length: 3-1/4" for compact installations
• Check our size image to verify spline count and D-profile orientation

What operating limits and durability can I expect?

This coupling is constructed from solid alloy steel with outer plating to resist corrosion and wear in harsh environments. It is rated for a maximum operating speed of 4000 rpm and supports working articulation up to 35° — suitable for many off-road and industrial steering scenarios.

• Maximum operating speed: 4000 rpm
• Maximum working angle: 35° for safe articulation
• Plated alloy-steel body for corrosion resistance
• Designed for repeated torque cycles in automotive and equipment use

Which vehicles and machines commonly use this joint?

Its combination of spline-to-DD connection and short overall length makes it ideal where compact, high-strength couplings are needed. Typical uses include performance street rods, muscle cars, rock crawlers and mechanized equipment like grinding machines and automated lifts.

• Aftermarket steering shafts on SUVs and off-road rigs
• Custom builds: hot rods, sand rails and street rods
• Industrial linkages: levelers, parking lifts, grinding machines
• Compatible with single steering shaft setups and performance driveline conversions

How should I verify compatibility before installing?

Measure the inner bore diameters and confirm spline count and D-profile orientation match your shafts. Also check the available shaft clearance so the 3-1/4" overall length and 1-5/8" outside diameter will fit without interference.

• Confirm 3/4" maximum bore on both spline and DD ends
• Count 36 splines on the spline end for exact match
• Verify shaft coupling method (press-fit, clamp, set-screw) to plan installation
• Allow clearance for up to 35° of operating angle

Who is this for? This RABROPAR universal joint suits mechanics, fabricators and enthusiasts who need a short, heavy-duty coupling between a 3/4" 36-spline shaft and a 3/4" double-D shaft. It’s aimed at builders of off-road rigs, hot rods, custom steering systems and industrial machines that require a compact, plated-alloy-steel joint rated for up to 4000 rpm and moderate articulation.