My EX35 has 220K on it. Transmission is making hollow scraping type sound shifting between gears. Maybe something scraping on trans housing. Noise is near driver cab. Sometimes the sound doesnt occur after been driven for a while, or when I hammer it. But in the cold morning it is always rather loud. Been gradually getting worse. Performance doesnt seem to be affected, no issues shifting or staying in gear. Any ideas what I need to replace?