Engine power and RPM continue to increase, creating the need for different transmission and axle ratios to get the car down the track as quickly as possible. The innovative Sonnax 1.58 ratio Extreme planetary assembly kit 28158G-06SP 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 different transmission.
Extreme planetary assemblies from Sonnax include Advanced Process sun gears and pinions made to the same exacting standards used on Formula 1, Nascar and other high-end professional racing circuits. Advanced Process parts undergo an additional three-step process that allows for greater durability and higher levels of performance. These units are fully assembled and ready to install.
The 1.58 assembly's front and rear sun gears undergo an additional Dry Film Lubricant (DFL) treatment to reduce spalling and improve longevity. The carrier also includes high strength steel/bronze/PTFE-coated rear sun gear washer and pinion thrust washers.
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
May 09, 2017
Topics: Diagnostics And Theory Transmission GM Powerglide TransmissionWatch Now
Contact a Sonnax Parts Distributor.