Rack & Pinion Adapter 3/4 I.D. 26-Spline

The MEZIERE Rack & Pinion Adapter 3/4 I.D. 26-Spline (model RP01) is a precision steering component designed to connect rack and pinion assemblies to u-joint shafts in high-performance vehicle installations. This steel adapter translates a 3/4-inch inner diameter bore to a 9/16 x 26-spline output, enabling seamless integration of aftermarket or replacement steering systems into custom-built powerplants and track-focused builds.

Constructed from steel in a natural finish, this compact coupling measures 3.8 inches in length with a 2.1-inch outer diameter and 1-inch height, allowing installation in tight engine compartments common to race cars and restomod projects. The 26-spline engagement provides positive torque transfer without slippage, critical for responsive steering control at speed. The adapter's modest weight of 0.16 lbs minimizes parasitic mass while the precision-machined spline interface tolerances ensure proper alignment with both OEM and aftermarket steering shafts.

This adapter is essential for builders constructing custom-shaft steering systems, converting vintage vehicles to modern rack-and-pinion layouts, or modifying engine bays where factory steering components require repositioning. MEZIERE components serve the performance and restoration automotive market, where precise mechanical interfaces directly impact driving experience and safety. Engineers and fabricators rely on splined adapters like the RP01 to maintain steering geometry tolerances while accommodating non-standard shaft configurations.

Whether sourcing a replacement coupling or designing a complete aftermarket steering system, verify that the 3/4-inch bore and 26-spline output match your shaft specifications before ordering. This is a single-unit adapter and does not include fasteners or u-joints.