Hello,
It sounds like that the transmission might require looking at by a specialist workshop for accurate diagnosis.
The most common cause of a noisy transmission is insufficient oil, causing the gears or internal assembly to hum or whir. If a noisy transmission does have enough oil, the lubricant may be contaminated with metal shavings or particles.
Insufficient or contaminated oil may cause the transmission to become noisy in some or all of the gears. But if you hear noises in specific gears, that gear's teeth or synchronizer may be worn or damaged.
Average prices for a good used transmission are around  350 excluding labor and clutch, if a new one is required.
Please let us know if you require any more specific advise
Cheers, Boris
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Thursday, March 25th, 2021 AT 10:18 AM