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.
Sonnax saves lives with these HP parts. Absolutely the best available on the planet.D. Nilsen
Universal kit made from high-strength alloy eliminates spline twist and wear. Fits all input carrier styles.
You carry the most precise and updated parts to build the perfect 700R4 and the 4L60E, 4L65E, 4L70E. This includes the Smart-Tech Input drum one of my favorites and the Zip kits for a well-built bullet proof transmission. Thank you guys for supplying awesome quality performance parts.F. Gonzalez
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.
I rebuilt the 4L60 transmission in my ‘59 Chevy Truck for the first time, on my own, three years ago using every Sonnax component available for my application. Burnout after burnout, that thing has taken all sorts of abuse with NO problem whatsoever. YOUR PRODUCTS EFFING RULE!!!J. Solano