Interesting video on making a chain drive diff unit without welding or using a lathe.

https://www.youtube.com/watch?v=aah2ufNfu9Q

I presume that you meant https://www.youtube.com/watch?v=8Xi04c4ozg8

"without welding or using a lathe"

you sure?

Have you got the right link? This one appears to be for a 2-speed transmission (and he spends most of it using a lathe).

Oops, wrong link. Heres the correct one!!!

https://www.youtube.com/watch?v=8Xi04c4ozg8

[Edited on 9/8/21 by myke pocock]