High Performance Transmission Products
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.
New Parts Tech Articles
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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.
Sonnax Industries is an Employee-Owned Company
1 Automatic Drive · Bellows Falls, VT ·
05101-0440 · U.S.A.
800-843-2600 ·
802-463-9722