Nissan RE4F03B Shift Kit, 2000-Up (Transgo) Corrects/Prevents/Reduces: Rough 1-2 Cold. No 3rd after 4-2 or 3-2 kickdown. Leaky worn, bad design inner clutch seal, Hard or Soft 1-2 shift. Long shifts hit rev limiter. Firmer 4th & Lockup. "Improved shifts + High temp ring" Special Instructions: Does not require transmission removal for proper installation.