I have a '88 300TE and the transmission works fine but it sounds "loud" like the whirring of an engine. It is definitely louder than my wife's '91. I replaced the K1 valve, filter, and fresh oil so shifting is fine but the noise persists. I'm just not confident in driving it long distance with this noise and am considering buying a rebuilt transmission. Should I run it till it fails or get it fixed now...

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