ive had a quick preview so far and it looks very busy out there on track especially from the start. i do enjoy your video's, thanks for posting. and congrats on the achievements with the car so far
make sure you adjust the diff pinion angle to match that of the engine/gearbox otherwise your uni's will constantly fail and it'll always have driveline vibrations
congrats on getting it running, it'll be an exciting car to drive no doubt
i cant tell you what the thread size is but for my 12a ute i used the original 'nut' (if you can call it that) when i had the accel cable made, might be an option for you also?