I’ve reread your timeline- sounds like something is wrong with the replacement gearbox, since it hasn’t ever worked without noise. Where did you get it from?
M47 gearboxes are so cheap now that if you could swap the gearbox yourself you could replace the gearbox you have with a known good one for little money. Perhaps not so appealing as a test if you’d be having a garage do the work though due to the extra cost of labour...
Are your engine and gearbox mounts in good condition? Propshaft ujs?
Cheers
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