RABROPAR 3/4-inch 36-spline to 3/4-inch DD Steering Shaft Universal Joint — Chrome Alloy, 3-1/4-inch, 35°

RABROPAR's 3/4" 36-spline to 3/4" double-D steering shaft universal joint is a chrome-plated alloy coupling designed to join a splined shaft to a DD shaft with a compact 3-1/4" overall length.

This compact universal joint coupling is built from solid alloy steel with outer plating for corrosion resistance and durability in steering and light-duty driveline linkages. It accepts a 3/4" spline on one end (36 splines) and a 3/4" double-D (DD) bore on the other, providing a simple mechanical connection for steering columns, rock crawlers, street rods, and small industrial drives. The piece is engineered to operate up to 4000 rpm and offers a working angle up to 35° for moderate misalignment while maintaining a small footprint for tight installations.

What are the exact dimensions and mechanical ratings of this coupling?

The coupling measures 3-1/4" overall length with an outside diameter of approximately 1-5/8". One end accepts a 3/4" maximum spline diameter with 36 splines, the opposite end accepts a 3/4" maximum DD bore. Maximum recommended operating speed is 4000 rpm and the maximum working angle is 35°.

• Overall length: 3-1/4" (82.6 mm)
• Outside diameter: 1-5/8" (approx.)
• Ends: 3/4"–36 spline on one side, 3/4" DD on the other
• Max operating speed: 4000 rpm; max working angle: 35°

How does this coupling install and what should I verify before fitting?

Installation is straightforward: slide the correct shaft into the matching bore (spline end or DD end) and secure per your vehicle or equipment's retaining method. Confirm that the spline count, bore diameters, and DD orientation match your steering column or shaft profile before assembly to avoid fitment issues.

• Verify 3/4" spline diameter and 36-spline count before fitting
• Ensure the mating DD shaft is 3/4" and oriented correctly
• Use proper retaining hardware or set screws as specified by your application
• Check clearance for the 35° working angle in the installed position

Which applications and vehicles is this universal joint suited for?

This coupling is intended for steering and small driveline tasks in a range of hobbyist and light industrial uses. Typical fits include muscle cars, street rods, hot rods, rock crawlers, sand rails, automated parking lifts, grinding machines, and other machinery requiring a 3/4" spline-to-DD connection.

• Aftermarket steering shafts for SUVs, hot rods, and muscle cars
• Rock crawler steering linkages that require a compact joint
• Small industrial drives, levelers, and automated parking equipment
• Compatibility with sand rails and off-road builds needing robust coupling

What materials and finish does the U-joint use, and how does that affect longevity?

The coupling is made from solid alloy steel with an outer chrome plating that improves corrosion resistance and surface durability. While plating helps resist environmental wear, correct lubrication, proper installation, and matching load limits will determine in-service life.

• Solid alloy steel core for mechanical strength
• Chrome outer plating for corrosion resistance
• Designed for light- to medium-duty steering and driveline use
• Maintenance: inspect and lubricate per equipment recommendations

Who is this for: This RABROPAR 3/4" 36-spline x 3/4" DD steering shaft coupling is aimed at DIY builders, restoration shops, and maintenance technicians who need a compact, plated steel joint for steering columns and small driveline tasks. Choose this part if you require a precise spline-to-DD connection with a small overall length, up to 4000 rpm rating, and application flexibility across street rods, rock crawlers, industrial equipment, and custom vehicle projects.