Fairbanks High Performance TransAction Shift Kit from Superior for the 4L80-E Transmissions This Transaction Shift Kit offers three levels of performance: Hi-Performance Street: For full street use. Firm, positive instant shifts. Retains full automatic features and standard shift points with selector in drive. Heavy Duty: For towing, off-road vehicles, campers, motorhomes, trailers, police, taxi, and any other extreme-duty use. Firm shift feel, but not harsh. Improves transmission life without loss of driver comfort. Full manual upshifts and downshifts when desired; normal operation retained for normal conditions. Full Competition: For all-out racing applications. Provides maximum shift feel and control. This TransAction kit will provide: Firmer, more positive shifts, improved acceleration and deceleration, reduces transmission wear and heat build-up, improves overall performance and helps eliminate soft erratic shifts.