My transmission is making a really loud sound when I shift almost every gear.

The sound can be heard when I shift the gear and I let the clutch take is friction point fast. (don't know if it make sens ... I'm french haha )

Here is a video I took starting in first gear.


What do you think it is ?

 

I'd check the driveshaft first.

 

Thanks, I'll take a look at this tomorow. Do you think it's the U-joint or something loose ?

The sound only appears when the clutch is engaging