Information for/from other sections

There are some similarities between the final drive/differential for Internal Combustion and Electric vehicles, should we make a separate page just for final drive, link the electric section here (once it's been created), or just copy/paste?

Also as was mentioned in the article, there is overlap between the electronics and validation sections, I think (as mentioned by someone else) we should add a link to the appropriate article and leave a high level simple explanation.

Definitely need another page for Differentials