4L60-E, 4L65-E, 4L70-E

Performance Pack
Part No. HP-4L60E-01

Fits '94-later units.

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The 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

GM 4L60-E, 4L65-E, 4L70-E Valve Body Layout

  • 4L60-E, 4L65-E, 4L70-E Performance Pack HP-4L60E-01


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 Pack

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.

Learn More about Sonnax Performance Packs