to reliable sources . Unsourced material may be challenged and removed . (December 2009) RL4R01A/RE4R01A Manufacturer Jatco Production 1988 – 2001 Predecessor 4N71 Class 4-speed longitudinal automatic transmission The 4R01 was a 4-speed automatic transmission from Nissan 's Jatco subsidiary. It was available as either a light-duty ("RL4R01A") or medium-duty ("RE4R01A")