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What noises typically signify that a transmission is on its way out? 200 1984

posted by  someone claiming to be cdcfrawford on  Tue Jan 2 22:17 CST 2018 [RELATED]

The m46 in my '84 245 is getting noisy. I am trying to isolate the problem to the transmission or the clutch and I think that I am leaning toward the transmission.

This M46 is original and has over 400,000 miles on it. Symptoms are gear or bearing noise in 1st, 2nd and 3rd. The noise is most noticeable when coasting to a stop with the clutch pushed in but I can hear the noise while accelerating through the gears, too. The pitch of the noise is related to the gear that I am in, which is why I believe that the problem is internal to the transmission. For example, if I push in the clutch at 30 mph in 3rd gear and allow the car to slowly coast to a stop, the pitch of the "hum" drops as the car slows down, but then when I downshift into 2nd gear (without letting the clutch out) it picks back up again.

I also get a nasty "growling" sound when I let off the throttle in 3rd gear.

Center carrier and u-joins are a few months old. Clutch is about 3 years old.

Any ideas? Try synthetic fluid and see if that buys more time?







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    What noises typically signify that a transmission is on its way out? 200 1984

    posted by  Fredneck Tom on  Wed Jan 3 13:16 CST 2018
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    Sounds like an input shaft bearing to me. That is the only shaft and it's bearing that changes speed when downshifting while coasting as you described. When the clutch is released, the input shaft turns at engine speed so noise should vary with engine rpm.
    it's a bit of a gamble, but I would bet the tranny will last a lot longer especially if you change the oil as previous poster suggested. Tom








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    What noises typically signify that a transmission is on its way out? 200 1984

    posted by  jwalker on  Wed Jan 3 08:01 CST 2018
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    last visit: Fri Jun 6 08:39 CST 2014
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    Honestly, it doesn't sound good. If you definitely have bearing noise in 3 gears it is only a matter of time before all the forward gears have it and the tranny lunches itself. Had that happen years ago.

    Yes, try switching to synthetic to see if that buys you more time. Long time ago, I did that on my 88 Jetta 16V and it bought me another year...







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