Just put my 1990 Wagon on the road. Is it normal for the M47 to make a deep tone during de-acceleration. It sounds like a exhaust leak but I can't find one. My sedan was auto so its possible that its just normal 5spd noise that I'm not use to. If so would Redline MTL help reduce the noise level?
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1990 240 Sdn 277K,tach,strut brace,turbo sway 1990 240 Wgn M47II 157K,tach,strut brace,poly bushings,IPD sways,bilsteins

Thanks for all the response. After driving the car a bit more I'm starting to think its just when the engine supplies braking action through the drivetrain. The affect is probably also amplified by an old exhaust system. Just a deep exhaust note. Something that wouldn't happen with my Sedan due to the automatic tranny.
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1990 240 Sdn 277K,tach,strut brace,turbo sway 1990 240 Wgn M47II 157K,tach,strut brace,poly bushings,IPD sways,bilsteins

Hello Yama,

Does your stick shift knob vibrates when yoiu hear that sound?
What about when the car is idling and not in motion, any vibrations in the stick shift knob?
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'89 244DL M47 161K miles

I'd inspect engine and trans mounts first. If they're sufficiently sagged or split, the trans can rub against the crossmember and all sorts of noise results.

Mine doesn't make any unusual noises with 231K on it, but I wouldn't say it's a quiet transmission. You can hear some noises.

You'll also want to check out all the rear axle bushings- anything bad back there can transmit noise through the whole driveline. And those sorts of things are likely to make different noises under accel vs. decel.
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Rob Bareiss, New London CT ::: '87 244DL/M47- 229K, 88 744GLE- 218K, 82 245T-181K Also responsible for the care and feeding of: 88 745GLE, 231K, 87 244DL, 239K, 88 245DL, 246K

Among the rear axle bushings, any that are easily replaced without a press or having to built a special tool? I'd like to start freshening up my rear end and want to start with the easy stuff first.

Thanks.
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'89 244DL M47 161K miles

Rear axle bushings are one of the few things that I haven't done yet. Actually one of the reasons I took the Sedan off the road and registered my Wagon was my rear axle bushings(i think its that) started getting really noisey. that along with AC not working,rear main oil leak and general need of new suspension components was enough reasons. It was still emotional as its been 15 years and 280000 miles that I've been with Betsy. Happy to say that she will be give needed TLC and not put out to pasture.
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1990 240 Sdn 277K,tach,strut brace,turbo sway 1990 240 Wgn M47II 157K,tach,strut brace,poly bushings,IPD sways,bilsteins

Well, my '89 w/ M47 makes no noise whatsoever and with 260k miles.
Once these trans have wear, no oil will change it much.
Be sure it's not somethning else like the exhaust, because the M47 would be more of a whirring if one of the gears were bad. Does it happen in all gears, or just the 5th gear (hiway)?
ps. I put in Mobil 1 ATF when I bought the car 6 yrs ago and it has run smooth, trouble free since, although was fine before that. The redline wouldn't be a bad idea, but you'd be throwing away good money if you have a bad trans.
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'89 245 Sportwagon, '96 960 sedan