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What mileage was on the second hand gearbox?
What sort of advice or help are you looking for?
Well the gearboxes in these cars M32,F40 arent known for their reliabilty often internal bearing wear failure on high mileage boxes is the most common cause normally starts in 6th,6 speed box in which you hear the noise most...If the noise changes in pitch each time the clutch is depressed and released then id say the thurst bearing is likely cause..if the noise is there at speed in all gears then likely the gearbox..its difficult to say 100% but maybe the best step would be to get it on a 2 post lift and run the car all through the gears whilst somebody under the car listens to see if the noise can be heard externally of the gearbox ..that may pin point it a little better
No problem., glad to help...please dont forget to leave a rating for me before you log out..much appreciated..