My 78' spitfire has a issue where the driveshaft clunks if you press the clutch normal speed when changing gears.
If you press it slowly and sit back in the seat, it shifts normally. I've replaced the driveshaft and CV axles already.
Well generally that means he's a rear differential is shot but the transmission itself so take the drive shaft off and then see if the differential will clunk when you spend things and if not it would be in the transmission realize those so it's been far so pretty cheaply right for example they don't even have real throw out bearings on their clutch it's just a piece of metal and plastic there's no bearing that spins around it just has sacrificial metal that wears out one of the cheapest designs of all time
It is closer to the transmission. It seems likely that a new one would not do this.