Sonnax Performance Pack

Material: Imidized Plastic
Dia.: 0.250&quot;

Performance Pack
Part No. HP-4L80E-01

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Sonnax Performance Pack HP-4L80E-01 upgrades GM 4L80-E and 4L85-E transmissions for maximum performance and durability in work/sport vehicles. Innovative components work together to precisely recalibrate pressures and shift accumulation, delivering firmer shifts under load without sacrificing low-speed drivability. To target common wear areas in the transmission, the kit includes many improved parts to repair damage, prevent future wear and improve reliability.

Recalibrated shift accumulation, with tunability for great, heavy-duty shifts
Improved pump components minimize leaks, plus maintain pressure and lube under demanding use
The only way to eliminate TCC PWM function without over-pressurizing the converter
Includes internal parts for setup and to prevent common failures

Contents

Line Pressure Booster Kit
Lube Regulated Pressure Regulator Valve
TCC Pressure Limiter Valve, Spring & Plug
AFL Filter End Plug & O-Ring Kit
Direct Clutch Dual Feed Plug
Direct Clutch Dual Feed Aluminum Plugs (3) 2 Extra
1-2, 2-3 & 3-4 Accumulator Piston Springs (3)
Checkballs (8)
Twist Drill .062"
Twist Drill .086"
Heavy Duty Case Bushing & Bearing Kit
Direct Housing Support Ring & Seal
Heavy Duty Intermediate Piston Spring Retainer Plate
Case Saver Retainer
Heavy Duty Clutch Retaining Ring Intermediate Clutch
Accumulator Valve Springs & Adjustable End Plug 2 Springs
Heavy Duty Direct Piston Return Springs (8)
Forward Clutch Hub Front Washer .078"
Reverse Servo Spacer Kit

Valve Body Layout

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.