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Faster tougher stronger


Heavy Duty & High Performance Upgrades

Sonnax’s innovative approach to design and manufacturing allows this venerable old transmission to thrive even as power and speeds steadily increase. Sonnax offers top-of-the line, proven solutions for aluminum Powerglide transmissions at any level of racing, and is the gold standard for circle track and bracket vehicles as well as the fastest door slammers running. To achieve a winning match of quality and performance, trust Sonnax to help you cross the finish line!

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Complete Servo Kits

Engineered from the Ground Up to Solve Old-School Problems


Overcoming the Servo Pin Bias Effect

OE Powerglide servo design flaws are responsible for many “mystery” band failures, broken shafts and staging issues. This video dramatically shows the pin bias effect in action and why Sonnax servo upgrades are critical for improving the reliability of the capable Powerglide transmission.

Sonnax powerglide transmission parts catalog v2 1

Powerglide Transmission Parts Catalog, Vol. 2

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Sonnax high performance products meet the toughest challenges faced by hard-working, daily-use drivetrains as well as racing units going all-out on the street or track.

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