Try getting up to 30 MPH, shut off the engine, keep the clutch depressed. AS you coast down to say 10 MPH downshift from 5th to 1st and see if it changes the pitch of the noise. Let me know what you find out. Imput shaft bearing will go frrom not too noisy to very noisy as you go from 5th down to 1st.
regards
Mech
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