1.80 Ratio Big Shaft Rear Sun Gear Kit
Part No. 18032-RSK

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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 the best way to connect huge power to Sonnax 1.80 ratio planetaries for great run after run with minimum downtime.

The 1.80 ratio big shaft rear sun gear kit 18032-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

The Sonnax big shaft system for Powerglides requires changing to a 35-spline turbine hub.

  • Rear Sun Gear 32 Spline
  • Thrust Washer
  • Gear Process Level: Extreme
  • Ratio: 1.80
  • Spline Tooth Count: 32
  • Powerglide 1.80 Ratio Big Shaft Rear Sun Gear Kit 18032-RSK


From the Bench: Building a World‑Class Powerglide Racing Transmission
Eliminate Powerglide Input Shaft Failure with the Sonnax Big Shaft System