The Jatco 5R01, also called RE5R01A (Nissan part) or JR502E/JR503E (Jatco part), was a 5-speed automatic transmission from Jatco and Nissan Motors for use in rear wheel drive vehicles with longitudinal engines. Introduced in 1989, the 5R01 was the first 5-speed automatic transmission, and is electronically controlled. [1] [2]