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.

Transmission Upgrades All Transmission Parts Request Catalog

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Sonnax saves lives with these HP parts. Absolutely the best available on the planet.

D. Nilsen
The perfect upgrade for more holding power without excessively harsh shifts.

Sonnax Servos

The perfect upgrade for more holding power without excessively harsh shifts.
4L60E Performance Pack

4L60E Performance Pack

The Best Performance Parts in One Complete Kit
4L60-Series Heavy Duty Reaction Shaft Kit

Heavy Duty Reaction Shaft Kit

Universal kit made from high-strength alloy eliminates spline twist and wear. Fits all input carrier styles.
2.84 Ration Input Carrier Kit

2.84 Ratio Input Carrier Kit

Ramp Up from OE Wide Ratio to Race-Ready Close Ratio
SMART-TECH® Input Housing Kits

Smart-Tech® Input Housing Kits

Upgraded Housing Eliminates 3-4 Clutch Failure
Input Housing Forward Sleeve Kit

Input Housing Forward Sleeve Kit

Combine with overrun sleeve for maximum protection against input housing failure.

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

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!

View 4L60/E Build Guides

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.

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

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
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