U-Joint, 3/4 36 Spline To Charlynn Power Steering

OVERVIEW

When you are navigating the punishing terrain of a wash-out or carving through deep dunes, the integrity of your steering system is the only thing standing between a precision line and a total loss of control. The EMPI Heavy-Duty U-Joint, specifically designed to bridge the gap between a standard 3/4-36 spline steering shaft and a Charlynn-style power steering unit, is a critical component for high-performance off-road builds. This isn''t just a connector; it is a precision-engineered link designed to handle the high-torque demands of power-assisted steering systems in rugged environments. Whether you are upgrading an existing sand rail or building a trophy-truck-inspired Baja Bug from the ground up, this U-joint provides the smooth, bind-free articulation required to maintain steering feedback while benefiting from the hydraulic assistance of a Charlynn motor.

Crafted from high-strength forged steel, this U-joint is built to withstand the constant vibration and shock loads that are synonymous with air-cooled VW off-road racing. The 3/4-36 spline side ensures a rock-solid, slip-free connection to your steering column, while the Charlynn-specific side is machined to the exact tolerances required for a perfect fit on your power steering pump or orbital valve. By utilizing high-quality needle bearings rather than simple bushings, this unit minimizes internal friction, which is vital for preventing the "notchy" steering feel often found in inferior components. When you choose this EMPI U-joint from Appletree Auto, you are investing in a component that has been proven in the harshest desert conditions, ensuring that your steering remains responsive and reliable even when the trail gets technical.

FITMENT

This U-Joint is designed for custom steering applications and power steering conversions. It is commonly used in the following vehicles and setups:

• Sand Rails & Dune Buggies: All custom frames utilizing Charlynn power steering units.
• Baja Bugs: Modified Volkswagen Beetles with upgraded off-road steering racks and hydraulic assists.
• Manx-Style Buggies: Street or dirt builds featuring 3/4-36 spline steering columns.
• Off-Road Race Cars: Class 1, Class 5, and Class 10 vehicles requiring high-angle steering joints.
• Custom Hot Rods: Any application using a 3/4 inch 36-spline shaft to a Charlynn-style pump or valve.

SPECS

• Part Number: 17-2633-0
• Side 1 Connection: 3/4 Inch - 36 Spline
• Side 2 Connection: Charlynn Power Steering (Keyway Style)
• Material: Heavy-Duty Forged Steel
• Bearing Type: High-Precision Needle Bearings
• Finish: Natural Steel / Zinc Plated for Corrosion Resistance
• Maximum Operating Angle: Up to 35 Degrees
• Included Hardware: Hardened Set Screws for Secure Mounting
• Quantity: Sold Individually

PRO TIPS

1. Proper Phasing is Critical for Smooth Steering

When installing multiple U-joints in a steering system, it is vital to ensure they are "in phase." This means the yokes at each end of the intermediate shaft must be aligned in the same plane. If the U-joints are out of phase, they will rotate at slightly different speeds as they articulate, resulting in a pulsating or "lumpy" feeling in the steering wheel. Always double-check that the "ears" of the yokes are perfectly parallel before final installation to ensure a consistent, linear steering response throughout the entire rotation of the wheel.

2. Secure the Connection with Dimpling and Loctite

Off-road vibrations are notorious for loosening even the tightest fasteners. When installing this U-joint on your 3/4-36 spline shaft, don''t just tighten the set screws. We recommend "dimpling" the shaft. Mark where the set screw hits the shaft, remove the U-joint, and use a drill bit to create a small indentation (dimple) for the set screw to seat into. When you perform the final assembly, use Blue (Medium Strength) Threadlocker on the set screws. This mechanical "lock" prevents the U-joint from sliding or stripping the splines under heavy hydraulic pressure or rough impact.

3. Manage Your Steering Geometry Angles

While this heavy-duty U-joint is capable of articulating up to 35 degrees, pushing it to the absolute limit can lead to premature wear and potential binding. For the longest service life and the smoothest operation, try to keep your steering shaft angles as shallow as possible. If your build requires an extreme angle, consider using a third U-joint and a support bearing (heim joint) to split the angle into two smaller, more manageable increments. This reduces the stress on the needle bearings and ensures the hydraulic assist from the Charlynn unit isn''t fighting unnecessary mechanical resistance.