December 09, 2014
4L60-E, 4L65-E, 4L70-E
Performance Pack
Part No. HP-4L60E-01
Fits '94-later units.
View Instructions Find a DistributorThe Sonnax Performance Pack for GM 4L60-E, 4L65-E and 4L70-E transmissions is a must-have for any heavy-duty vehicle and the very best foundation for high-performance racing. All components work together to carefully tune line pressure, accumulator pressure and shift calibration. It’s the ultimate way to get an impressive transmission that responds to throttle and increased load with quick, firm shifts.
- Consistent, firmer shifts under load without sacrificing low-speed drivability or guessing on calibration
- Faster pressure increase and higher overall pressure for greater clutch/band holding power
- Three ultra-reliable, patented, billet pinless accumulator pistons
- Unique 1-2 accumulator spring combination for shifts with character
- Improved high RPM pressure
- Third accumulator valve gets the 2-3 right the first time, every time
- Durable parts target commonly worn areas and prevent future damage to the accumulators and separator plate
- The only way to eliminate PWM function without over-pressurizing converters (optional)
- 1-2 Accumulator Valve Shim
- TCC Pressure Limiter Valve & Spring Optional, eliminates PWM/EC3 function
- Boost Valve with O-Ring .490"
- Elevated Pressure Regulator Spring
- High RPM Pump Slide Spring
- Spacer
- 4th Servo Return Spring
- Servo Cushion Spring
- Servo Piston D-Ring Kit
- 3-4 Accumulator Piston Kit
- 3-4 Accumulator Spring
- Servo Release Check Valve
- Forward Accumulator Kit
- Checkballs (8)
- Separator Plate Plugs Not Shown
- Twist Drills Not Shown
- 1-2 Pinless Accumulator Piston Kit
- 1-2 Accumulator Inner Spring
- 1-2 Accumulator Outer Spring
- 1-2 Accumulator Waved Spring
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.
GM 4L60-E, 4L65-E, 4L70-E Valve Body Layout
April 07, 2015
Drilling Orifices the Smart Way
March 02, 2016
Building the Killer 4L60E - Top Tips for Optimizing Your Transmission Upgrades
November 20, 2014
Torque Converter Journal: 20 Years Later - What’s New with 4L60-E PWM Modifications
April 28, 2017
4L60E Performance & Heavy-Duty Transmission Build Guides
June 06, 2018
All Over the Map: Attacking 4L60/E Burnt 3-4 Clutches with Confidence
Brian Wing
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Patents
- 6,619,323
- 6,899,211
Videos
Eliminate Leakage & Optimize Performance with Sonnax O-Ringed Valves
Harness that Horsepower! Your Guide to a Sonnax 4L60/E Level 3 Performance Build
The best working performance units we have done, and that’s not just from me, but my customers.
B. Bastedo
Advanced Transmission Care
Sonnax Performance Packs
The Best Parts for Performance & Heavy Duty Recalibration
Performance enthusiasts look to Sonnax when building stronger, faster, more reliable transmissions. Performance Packs combine key Sonnax performance and heavy duty parts into powerhouse kits which take transmissions to the next level.
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