Nissan Leaf transmission

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.

both gear box's incorporate a electronic parking brake mechanism

gen 2 gearbox

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

for details on bolt paterns check Nissan leaf motor couplers and adapter plates

gen1 with em61 motor

gear ratios

gen 2 gear box reductions gears and open diff

17:31 / 17:74

gen2 with em57 motor

gen2 leaf gear box, em57 motor and inverter

gear ratios

17:32 / 17:75