Nissan Leaf transmission
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the nissan leaf uses a single gear reduction box.
the input splines are the same across both the em61 and em57 motors, but the bolt pattern is different. you can not use a em61 motor with a gen2 gear box and vise versa.
a helical LSD is available for both gen 1 and 2 gearboxs from nismo japan
https://www.nismo.co.jp/products/nismo_parts/NEW_PARTS/index_2019.html#a2
gen1 with em61 motor
gear ratios
17:31 / 17:74
gen2 with em57 motor
gear ratios
17:32 / 17:75