No one knows transmissions & torque converters like


No one knows transmissions & torque converters like 2008-sonnax-logo-white

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Better Diagnostics = Better Rebuilds & Fewer Comebacks

Vacuum testing is an efficient way to evaluate transmission wear and the effectiveness of repairs. Sonnax pioneered the use of vacuum testing by recognizing that a worn valve or valve body bore can result in incorrect hydraulic pressures, leading to poor performance or failure of the transmission.

Vacuum testing is...

  • Economical - A vacuum testing station has a low initial cost to set up and requires minimal maintenance.
  • Quick & Easy - It doesn’t take long to become skilled at rapidly testing multiple areas.
  • Quantitative - Testing returns a specific value (inches of mercury) which allows rebuilders to establish pass/fail standards for proper valve body function.
  • Reliable - Test results are accurate and repeatable when routine calibration and basic test procedures are performed.

Get started with the right tools and knowledge from Sonnax!

Vacuum Test Stand Kit

A great alternative to building a custom testing rig.

Proper equipment and calibration is essential for accurate vacuum testing. The VACTEST-01K is a high quality kit which includes an assortment of testing tips, an anodized test stand to withstand years of use, plus easy-to-follow instructions for assembly, calibration and testing.

Vacuum Test Stand Kit

Vacuum Test Guides

Learn Locations to Test

Sonnax has done all the research for you. Vacuum testing guides show exactly where to test to determine if a valve and bore are worn out.

Identify Common Transmission Problems

Valves and common concerns associated with bore wear are clearly identified and described.

Select Parts for Repairs

Find a problem? Recommended Sonnax parts for successful repairs are listed, along with any required tooling.

Available Vacuum Test Guides:

Check back often to see the latest guides!
Vacuum Test Guide lineup

Test Result Data Sheet

Easily record and keep track of your results.

Evaluating test results requires establishing your own pass/fail standards in line with your customer's needs and shop warranty requirements.

Print or download your FREE Sonnax vacuum test data sheet to get started!

Test Result Data Sheet

Watch this three-part video series featuring Sonnax Tech Specialist Jim Dial demonstrating how easy it is for shops to identify the root cause of transmission problems by vacuum testing.

 What is Vacuum Testing?

 Vacuum Test Stand Setup and Calibration

 How to Vacuum Test

Learn Everything You Need to Know About Vacuum Testing

Sonnax experts share full details and recommendations on how to master vacuum testing.