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Hey MacDuff,
To answer your questions:
What does your noisy M47 transmission sound like?
Bad bearings, kind of a gritty rolling sound.
Does the sound vary by gear?
5th is the worst. 4th is good. 3rd has a little noise. 1st and 2nd who knows ? The engine is making too much noise.
You change the M47 transmission oil every second engine oil change? What oil do you use?
F type ATF. The bearings are toast, so I'm not going to pop for $$$ tranny fluid.
The M47 II in my 1992 240 GL was horrifically abused. The fluid was brown and a piece of gear tooth came out in that first oil change.
Yikes. Do you have a regular click in any gear ?
I have Amsoil ATF Ford Type F, yet per vvpete (brickboard, turbobricks user), if you have a healthy M47, use the Volvo spec gear oil, not synthetic or mineral Type F. Type F may not be good for the bronze bushes (?) and synchros in the M47. The next best bet is Redline MTL for the Volvo M47, so says vvpete. Yet I've been told by practicing Volvo mechanics a heavier viscosity, like a single 30W motor oil, may be okay. Yet motor oil may not protect the bronze bushes and synchros.
Owner's manual says F type ATF... I do think about 15W40 or straight 30 weight engine oil. Hondas used 10W30 for years in their manual transmissions and I suspect they have bronze bushings in there. The same is true with their bikes.
The Amsoil synthetic Type F made all miraculously smooth shifting and a cool as a cucumber transmission on hot Summer freeways. Well, no hotter than everything else, versus the really hot M47 II before Amsoil and the Redline MTL.
I don't know why Amsoil or Redline would run any cooler unless they are significantly cutting down the amount of power lost in the gearbox. ATF has worked for me, is cheap, available everywhere, and seems to be doing a fair job of flushing the grit out of the gearbox.
I think the big thing is to change the oil regularly and use what works for you.
Greg
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