diy two speed gearbox

[dcb]

found a site where the double chain gearbox is pretty well spelled out, a couple extra chains might be avoided if you have two sprockets on the rear wheel/axle, and/or can drive the input shaft directly. Anyway it might offer some ideas for small EV'ers to be able to climb hills AND have decent top speed (and a neutral) hopefully without the losses of a belt/pulley.

Widdershins Way - DIY Gearbox

[JasonG]

Warning ! Thread hi jack !

I recently learned some folks are using transfer cases backwards to make a poor mans overdrive unit.
Anyone here try it ?
From pull-a-part I could do it for ~$100 on my truck....

Bet it would work great on an EV

[dcb]

might be a bit over-engineered for a typical ev=lossy.