High Performance Transmission Products

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Heavy Duty & High Performance Upgrades

Sonnax high performance transmission products meet the toughest challenges faced by hard-working, daily-use transmissions as well as racing units going all-out on the street or track. Products range from innovative upgrades designed to fix everyday problems rebuilders see in their shops to an extensive line of Powerglide components. We also offer specialty parts for high performance torque converters.

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Sonnax SmartShell

Fix 4L60 series sun gear shell problems with BRAINS, not just brawn.

Stripped or cracked shells in GM 4L60 series units are a common problem, but strengthening the shell alone does nothing to prevent damage to the rear planetary assembly.

Learn more about the Sonnax Smartshell

Sonnax Industries is an Employee-Owned Company
1 Automatic Drive · Bellows Falls, VT · 05101-0440 · U.S.A.

800-843-2600 · 802-463-9722

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