GM 4L60E Performance Transmission Upgrades

Running the 700-R4/4L60E family of transmissions at extreme power levels demands innovative parts designed not only to work better, but to work better together. From street/strip upgrades and heavy-duty jobs to top-tier racing builds, Sonnax makes it easy to deliver rock-solid transmissions customized for any performance level.

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Build a KILLER 4L60/E or 700-R4 with Sonnax Build Guides

Whether you’re starting from scratch with a heavy-duty/performance build or optimizing a seasoned racing vehicle, key transmission areas MUST be addressed to realize the full potential of these units. Check out these handy build guides to get maximum results out of your rebuild!

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View 700-R4 Build Guide

Learn more about how to optimize 4L60E transmission upgrades.

Sonnax 4L60E Build Guides

Harness that Horsepower!
Your Guide to a Sonnax 4L60/E Level 3 Performance Build

The GM 4L60/E series are great transmissions used for decades in performance vehicles, but their reputation has somewhat suffered because old-school mods never significantly improved durability. Especially in extreme racing applications, modern horsepower demands modern parts, and that's what Sonnax delivers.

This video breaks down how to transform a 4L60E, 4L65E or 4L70E into a top-tier performance transmission with Sonnax Level 3 build components. Many parts also are found in Sonnax heavy-duty and Level 1 and Level 2 performance builds, so no matter what power level you're running at, it's a great way to understand the options when upgrading 4L60/E series units.

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.

Learn About Sonnax Heavy Duty & High Performance See All Heavy Duty & High Performance Upgrades