I would think if the clutch is slipping it wouldn't only exhibit the problem during the 4th to 3rd downshift...wouldn't it slip at other times?
Once the clutch is fully pushed down, it goes right into gear. It never makes the grinding noise when the clutch is fully up or fully down. It only grinds when you partially let up the clutch as the second video shows...fully down, nothing...let it up just a bit and it will grind. Only on the 4th to 3rd downshift.
It never grinds when you push the clutch pedal down. It only does it on release.
I’m trying to contribute to answers on this post while on vacation
Gotta day......as to clutch slippage, from my experience, it shows up in High gear but not in lower gears. Do Not expect the slippage to show itself equally thruout the gear set .