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1982 300TD-T 315k miles Drivetrain Noise

At about 30MPH a whirring sound starts from the back end. Volume and pitch increases with speed... independant of road conditions. The noise only accurs when the drivetrain is under load/acceleration. While under load (as on a long grade), down shifting does not affect volume or pitch.

No clunkiness. Tire tread wear is "normal". SLS is working properly.

Any thoughts? Pinion bearing...Drive Shaft support bearing? I do not have a ton of experience in this area.

Thanks in advance!

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Up the tire size 1983 300D Turbo Diesel

My stock tire size is 195/70 14 ~ 24.75 inch diameter. I was considering moving up to 205/75 14 ~ 26.1 inch diameter or 215/70 14 ~ 25.9. This would, in essence, give me the effect of an overall higher read end ratio. It feels as if the engine is revving more than it should at 65 - 70mph. Is this advisable? Also, what should the expected mile-per-gallon be for this year/model assuming everything is running correctly, and a conservative driving style? Thx, Bill

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