April 28, 2017
Harness that Horsepower! Your Guide to a Sonnax 4L60/E Level 3 Performance Build
Presented by Sonnax
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.
Learn More
December 09, 2014
20 Years Later: What’s New with 4L60-E PWM Modifications
April 07, 2015
Drilling Orifices the Smart Way
March 02, 2016
Building the Killer 4L60E - Top Tips for Optimizing Your Transmission Upgrades
February 22, 2016
Eliminate 3-4 Clutch Failure with the Smart-Tech® Input Housing
May 31, 2009
A New Trick in the Bag: Additional 2nd Gear Servo Size for the 4L60-E
Gregg Nader
October 24, 2018
Clean Up Your Shifts with Sonnax Line Pressure Booster Kits
October 24, 2018
Eliminate Leakage & Optimize Performance with Sonnax O-Ringed Valves
October 28, 2019
The Ultimate 4L60E Reaction Shaft Upgrade for Big Power Transmissions
June 05, 2013
Solve Multiple 4L60/E Problems in All Performance Applications with the Sonnax SmartShell®
Related Units
Related Parts
Required
Recommended
4L60, 4L60-E, 4L65-E, 4L70-E
SmartShell® Heavy Duty Reaction Shell Kit 77749-02K
Required
Recommended
4L60-E, 4L65-E, 4L70-E
TCC Regulator & Isolator Valve Kit 77754-03K
4L60-E '97-earlier only, non-EC3 units
-
Helps cure:
- Code 894, 1870
- Overheated converter
- Low TCC apply pressure
- 3-4 Clutch burned
- 1-2 Harsh
- Low line pressure
Required
Recommended
4L60-E, 4L65-E, 4L70-E
Actuator Feed Limit Valve Kit 77754-09K
-
Helps cure:
- Wrong gear starts
- Solenoid performance codes
- Erratic line pressure
- Clutch failure
- Band failure
- No 4th
- Harsh shifts
- 2nd Gear starts
While Sonnax makes every effort to ensure the accuracy of technical articles at time of publication, we assume no liability for inaccuracies or for information which may become outdated or obsolete over time.