Nissan RG4R01A, RE4R01A, RE4R03A & JR403E Transmission Superior Shift Correction Kit This Shift Correction Kit from Superior will improve all RG4R01A, RE4R01A, RE4R03A & JR403E Transmissions from 1988-Up for Regular, Heavy Duty & Extreme use. This Shift Correction Kit helps eliminate or correct the following problems: 2-4 band burn up, soft shifts, 1-2 accumulator seal blow out, inadequate lube oil (planet failure) and 4-3/3-4 shuttle problems. This Shift Correction Kit will come with installation directions in English and illustrations.