Hi All. I have changed the clutch on my F78. Bugger to get the gearbox back in but I finally did it. Whilst the driveshafts were off I started the Machine and tried out the clutch. In 1st gear, fantastic, it ticks over nicely and the clutch works well. To be sure I checked all the gears. What I've found is that as I change up a slight knocking noise get louder and louder. By the time I get to 5th its really bad and i'm worried i'm doing damage to the box. If i rev the engine, however, the noise disappears until i let it back down to tick over. I've also noticed that sometimes the knocking is quieter for some clutch presses than other?! I am really perplexed by this. Have I damaged the spigot bearing or driveshaft? Got a new fault in the gearbox? Or must I have the drive shafts back on to provide load to the gearbox? Also, if the box has lost a tooth, is it possible to buy individual cogs? The box seemed fine before i changed the clutch. But that was with the drive shafts on and its difficult to tick over in 5th anyway. Any ideas or advice greatly appreciated. Thanks in advance.