Reading on other forums, they seem to be saying it is the same kit as an HPI RS4. If that's the case, there's more spares than you'll know what to do with! Post some pics with the body off mate!
http://bangshift.com/bangshiftxl/quarter-scale-grave-digger-powered-tiny-supercharged-conley-stinger-v8-engine-sweet/ Haaaaaa, just thought I'd tease you, honest:p
Just an update on my drive problems, turns out the centre diff gears were trying to climb out the diff case, replaced with a heavy duty setup! Fingers crossed