Quick Disconnect Coupler

The Mark Williams Quick Disconnect Coupler (Part #40830) is a male transmission coupler engineered for Powerglide automatic transmissions. This 27-spline steel coupling delivers the precision fit and durable connection required in high-performance drivetrain applications. Built from black oxide–finished steel, the quick disconnect design allows for rapid shaft separation and reassembly without special tools, making it ideal for transmission rebuilds, swaps, and test-bench configurations.

The 27-spline male configuration ensures compatibility with standard Powerglide input shafts and mating female couplers. The black oxide finish provides corrosion resistance during storage and handling, protecting the spline geometry from oxidation that can interfere with engagement. Weighing 3.33 lbs with compact dimensions (3.55 × 3 × 5.65 inches), the coupler is designed for straightforward installation in transmission test stands, dyno cells, and custom drivetrain builds. The quick disconnect mechanism eliminates repeated spline wear from manual disconnect-and-reconnect cycles common in development and troubleshooting workflows.

This coupler is specified for builders, transmission specialists, and performance shops working with Powerglide automatics in street machines, drag racing platforms, and test environments. Quick disconnect couplers streamline the workflow when frequent shaft access is required—whether for clutch inspection, torque converter evaluation, or transmission bench dyno testing. Mark Williams components are recognized for precision manufacturing and repeatable tolerances, supporting the demanding requirements of transmission development and high-performance drivetrain integration.

The Powerglide transmission, introduced in 1962, remains a platform of choice for hot rodding and lightweight performance applications. Its simplicity and strength make it a natural fit for quick-build street cars and entry-level racing platforms. A quality quick disconnect coupler reduces assembly time and mechanical fatigue on expensive shafts, making this component a practical investment for any shop that handles Powerglide transmissions regularly.