Stop worrying about input shaft failure when running the GM Powerglide in the most extreme applications. Sonnax offers the only big input shaft upgrade with custom components designed to work together for reliable performance. Whether you have an existing assembly or start from scratch in the gear ratio of your choice, it’s best way to connect huge power to Sonnax Extreme planetaries for great run after run with minimum downtime.

The 1.65 ratio big shaft rear sun gear kit 16532-RSK is one of the five components in the Sonnax Powerglide big shaft system.

• Gear prepped to accept big input shaft's fine-tooth rear spline
• Custom, PTFE-coated thrust washer replaces sun gear thrust bearing