Lock-Up Plug 31 Spline 1.375in Long

The Winters Lock-Up Plug 31 Spline 1.375in Long is a differential locking component designed for high-performance drivetrain applications where positive traction control is essential. This 31-spline plug engages the lock-up mechanism in Winters differentials, providing the driver with the ability to mechanically lock both wheels for improved off-road traction and drag racing performance. Manufactured from steel in natural finish, the plug is built to withstand the extreme forces generated during aggressive acceleration and challenging terrain navigation.

The 1.375-inch length and 31-spline configuration are precision specifications matched to Winters differential housings, ensuring proper engagement depth and rotational torque transfer. Hardware is included, allowing for straightforward installation in compatible differential assemblies. The steel construction provides durability under repeated lock and unlock cycles, while the natural finish resists surface corrosion in typical automotive environments. This component is essential for drivers who demand maximum traction when conventional open or limited-slip differentials cannot deliver the holding power needed for competition or severe-duty applications.

This lock-up plug serves professional drag racers, off-road competitors, and serious off-road enthusiasts who operate Winters differentials in their custom or race vehicles. It is not a drop-in upgrade for OEM differentials and is intended only for use in properly configured Winters differential systems. Correct installation and setup are critical to safe operation; buyers should consult their differential manufacturer's documentation or work with a qualified drivetrain specialist to ensure proper fitment and function in their specific application.