Parts / Product Profiles


Posted by OnAllCylinders Staff on February 6, 2021 at 10:21 am


If you have a headache while looking at that maze-like thing, read on. Sonnax has a tool to help decipher it. (Picture / Summit Race)

Have you ever looked at the automatic transmission valve body? It’s a complex network of transitions and valves – we’re talking about the complexity of “Rube Goldberg meets MC Escher”.

This means it can be really difficult to diagnose automatic transmission problems. From awkward loud noises to uneven slippage, there are a lot of problems with automatic transmission valve body issues.

That’s why Sonnax Transmission Company comes to the rescue Vacuum Test Plate Kits.

At the heart of each kit is a clear test plate that seals all critical transitions, matching the entire transmission valve body casting. The test plate has strategically placed ports where you can check the vacuum in isolated passages and help you quickly identify where problem areas are.

Better yet, Sonnax is a ton free vacuum test data reference guides On the website for the most common automatic transmission models, complete with specific problem diagnostics and spare part numbers. Take a look at this for the GM 4L60-E:

This is just a small part of the comprehensive GM 4l60-E troubleshooting guide that Sonnax offers for free on its website. Combined with test plate kits, your automatic transmission repairs could have become a lot easier. (Image / Sonnax)

If you want to see how useful vacuum testing can be in troubleshooting an automatic transmission, Sonnax has even created a video to walk you through the process. Check it out here.

Tags: Automatic transmission, Sonnax, transmission technology