Sonnax offers complete GM Powerglide planetary assemblies in a variety of gear set options and configurations to ensure you get the performance you want without overpaying or sacrificing quality. Each comes fully assembled and ready to install.
Track-proven to 3,000 HP, Sonnax Extreme planetaries are the finest quality Powerglide planetary assemblies in the world. From carrier and output shaft to gears and thrust washers, every component is refined for maximum durability in the most demanding applications. The ring gears are even pre-drilled for the Sonnax stabilizer system to prevent vibration and broken reverse friction plates. Extreme gear sets feature Sonnax premium sun and pinion gears that also undergo the same advanced processing used in Formula 1™, NASCAR® and other high-end professional racing circuits.
1.58 ratio Extreme planetary assembly kit 28158G-06 delivers tunable control right at the start, when traction can make or break a race. The one-of-a-kind Sonnax 1.58 is designed to fit into existing Powerglide cases, allowing racers to achieve the lowest numerical ratio available for the Powerglide without the hassle and expense of converting to a TH400.
See chart and specs below to determine if this planetary assembly suits your application, or dial in options here to choose your build.
Track-Proven to 2,000 HP
Track-Proven to 3,000 HP
|Sonnax Warranty||2 Years (Gears Only)||2 Years (Gears & Shaft)|
|Gear Material||9310 Suns & Pinions||9310 Suns & Pinions|
Advanced (Learn More)
Extreme Gears for Extreme Performance
To greatly improve the life of Extreme gear sets, the sun and pinion gear undergo the same advanced processing as assemblies developed for Formula 1™, NASCAR® and other high-end professional racing circuits:
Advanced Process gears undergo a three-step process that takes aftermarket performance gear manufacturing to a whole new level:
|Shaft Splines||Cut Spline||Rolled Spline|
|Ring Gear||Standard||Maximum Duty|
Applies to planetary assembly kits only
The 1.58 gear set has had a significant impact on helping my racing program this year and played a big part in our being able to win two races and be more competitive. It has enabled us to have a much greater tuning window and allowed us to apply the power from the engine more efficiently. The 1.58 has over 50 passes on it and is still going strong. Thank you to Sonnax for making such a great product and for developing new transmission parts so that we as racers can continue to improve and go faster.K. Ashley Kevin Ashley Racing Newark, DE