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.
1.65 ratio Extreme planetary assembly kit 28165G-NS is based off the innovative Sonnax 1.58 ratio architecture fitted with 1.80 style 12DP gears. This is the lowest numerical ratio 12DP gear set for the Powerglide that does not rely on troublesome stepped or timed pinion gears. This kit is compatible with all Sonnax extreme duty input shafts, although its primarily for use when building a big input shaft system.
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|
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 Sonnax big shaft system for Powerglides requires changing to a 35-spline turbine hub.