The differential is a tricky item on a chaindriven BEC. In this video, I replace the crown wheel on an Audi A6 Quattro rear differential* with a motorcycle sprocket, fit plummer block bearings and mount inboard rear disc rotors.

*(Diff scavenged from a wreckers' yard. It's an open diff as I don't think an LSD is necessary for my 'dry weather lightweight BEC' application).

Credit the Master
What's Going On In Doug's Shed "How to Build a Simple MX5 Chain Drive Differential No Machining, No Welding"    • How to Build a Simple MX5 Chain Drive...  

Music Credit:
Doctor Turtle Beaconsfield Villas Stomp, CCBY
Andy G. Cohen Through The Lens, CCBY
Free Music Archive, https://freemusicarchive.org