Faster tougher stronger

GM 700-R4, 4L60, 4L60-E, 4L65-E & 4L70-E

Heavy Duty & High Performance Upgrades

Running the 700-R4/4L60-E 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.

View Performance Parts by Application:

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 4L60-E, 4L65-E or 4L70-E 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.

Build the killer 4L60-E with Sonnax

4l60e build sheets 3d2

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.

View, print or download build charts
Syclone racing cropped

Ray Lichtenberg's "Hated" Syclone

  • Level 3 Sonnax 4L60/E Build
  • 900 HP
  • 1,000 ft-lbs
  • AWD

Still going strong after 3 SEASONS on the road and track, Sonnax upgrades harnessed the Syclone's huge horsepower and massive torque during the 2017 Optima Ultimate Street Car Challenge.

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