Read about some kind of magic oil for the diff that I'm gonna give a go, guess fresh gearbox oil can't harm
No magic oil helps, sawdust might ;)
Maybe look at synthetic oils, helped in a few older gearboxes.
Edit - checked the engine mounts?
@lynx started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Read about some kind of magic oil for the diff that I'm gonna give a go, guess fresh gearbox oil can't harm