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Old 01-21-2014, 10:03 AM   #1
MCPeach
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Default how long do I have with singing diff

My diff is is singing intermittantly, and wonder how long I hsve. I changed the oil, noticing metal shavings on the plug.
If the spider starts singing, I know that I only have a few miles before it dies.
Hopefully, it plays like the classic engine knock and goes for tens of thousands of miles.
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thanks
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Old 01-21-2014, 10:34 AM   #2
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How long do you have?
Who knows, could be 30' or it could be 300,000mi.
That's why people repair rather than drive into the ground.
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Old 01-21-2014, 11:08 AM   #3
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Depends on what song it's singing.

Whine going down the road is R&P. Noise when turning is spiders. Usually whine from the R&R that has slowly grown louder with miles will still have a while to go before it fails, especially with decent oil in there. Noise that suddenly started, or that started after some brutal event (donuts, burnouts, N-drops, etc) then you may not have that much time left.

Does the noise change between drive and coast? If so, probably some wear developing in the R&P. If not, could be something simple like a wheel bearing or carrier bearing.
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Old 01-21-2014, 12:33 PM   #4
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Thread jack:
differential drain plug washer. Is is the same as the oil pan drain plug washer?
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Old 01-21-2014, 12:42 PM   #5
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Thread jack # 2

Anyone have an issue with lockers staying locked at lower speeds once engaged? Releases fine after 40kph but stays locked under. Assuming some metal bits are floating around.... :(
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Old 01-21-2014, 12:53 PM   #6
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Should be a pipe plug, haven't seen one of the D30's with a washer thus far that I can recall.
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Old 01-21-2014, 02:30 PM   #7
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Thread jack # 2

Anyone have an issue with lockers staying locked at lower speeds once engaged? Releases fine after 40kph but stays locked under. Assuming some metal bits are floating around.... :(
if it stays locked I would consider that a good thing hahaha. on a serious note though yeah probably some broken crap in there
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Old 01-21-2014, 02:43 PM   #8
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Originally Posted by c View Post
Thread jack:
differential drain plug washer. Is is the same as the oil pan drain plug washer?
IPD lists the drain plug washer as 11998 (refence here http://www.youtube.com/watch?v=3mBSanc7dBw)
http://www.ipdusa.com/products/8408/...ug-washer-seal

FCP lists 11998 as oil drain plug washer
http://www.fcpeuro.com/products/volv...FU9p7AodsgsAvw

so maybe....
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Old 01-21-2014, 03:57 PM   #9
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Thread jack # 2

Anyone have an issue with lockers staying locked at lower speeds once engaged? Releases fine after 40kph but stays locked under. Assuming some metal bits are floating around.... :(
My g80 does this too. It unlocks if I drive over 40km/h or if I drive in the opposide direction for a few feet, in addition my diff whines a bit at 80-90kmh and had been doing it for 3 months with no sound change
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Old 01-21-2014, 03:59 PM   #10
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Mine whines at 130+kph.

I'd like to just change the fluid but I'm afraid I'll disrupt it and it'll die in a week.
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Old 01-21-2014, 04:02 PM   #11
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Mine whines at 130+kph.

I'd like to just change the fluid but I'm afraid I'll disrupt it and it'll die in a week.
mine leaks - need to do some PM on it before I get the whine.
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Old 01-21-2014, 04:08 PM   #12
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while we are discussing differential PM what type of gear oil is the go to stuff?
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Old 01-21-2014, 06:05 PM   #13
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I have a little whine from the rear of my 245. It was like that when I got it, 15 years and 50k miles ago. No different now.
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Old 01-22-2014, 07:42 AM   #14
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Thanks gsellstr. Then its the r&p,,, definitely like to thrash around on the local dirt roads. I get the high pitched songfor a few seconds, intermittantly upon cold startup going straight, and havent noticed it once warm. Problem is not wanting to risk a break out there, and certainly not fully loaded returning to washington.
Whats the diff ratio for the m47 5 speed manual?
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Old 01-22-2014, 11:26 AM   #15
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If it's only when cold, change out your fluid and run it. I've had a light whine on mine for 3 years now, Elliott's had a loud whine on his for about the same, and we both flog the crap outa them, mine with a good bit of power to the ground and the trutrac to get it there.

Swap it over to something like Lucas 80-90 or 80-140, see if it goes away.
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Old 01-22-2014, 11:29 AM   #16
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Thanks gsellstr. Then its the r&p,,, definitely like to thrash around on the local dirt roads. I get the high pitched songfor a few seconds, intermittantly upon cold startup going straight, and havent noticed it once warm. Problem is not wanting to risk a break out there, and certainly not fully loaded returning to washington.
Whats the diff ratio for the m47 5 speed manual?
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Old 01-22-2014, 11:34 AM   #17
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Thanks gsellstr. Then its the r&p,,, definitely like to thrash around on the local dirt roads. I get the high pitched songfor a few seconds, intermittantly upon cold startup going straight, and havent noticed it once warm. Problem is not wanting to risk a break out there, and certainly not fully loaded returning to washington.
Whats the diff ratio for the m47 5 speed manual?
Ratio should be 3.31 for an M47 of your vintage, AW7x automatics came with 3.73.
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Old 01-22-2014, 02:27 PM   #18
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The driveline center support may be singing until the tired grease/bearing warms up.
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Old 01-23-2014, 04:05 AM   #19
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Center support. The R&P will whine constantly at certain speeds. Silver 245GL has R&P whine from about 45 mph on up. Doesn't help that there are poly big TABs installed, which probably helps transmit the noise to the body.

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Old 01-23-2014, 09:33 AM   #20
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Thanks j, and redwood. Ive had the center bearinging whine, this is sharper and higher. Combined with he shavings on the magnetic drain plug during the very recent oil change to 80/90, indicate r&p.
Thanks for the encouragement gellstr and blue. Im more relaxed, but will have no fun romping around to increase my odds should I not find the spare.
I think my next move is to change the oil again to see what shavings were produced inthe interveening 500 miles for a better idea.
Brickers, and this site are greatly appreciated.
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Old 01-05-2016, 05:03 PM   #21
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Resurrecting an old post,

if the whine is under load or steady speed, but not coasting, is that the ring and pinion?

can any adjustment reduce the noise?

is respect of the oil: when I got my car (1800e) a couple years ago, the diff oil had not been changed for a long time and was chocolate milk, which, I think means water. in any event I've now changed it 4 times, the last 2 with Lucas synthetic gl5 which apparently has some noise additives, which has reduced the whine noticeably but not to where it might be acceptable.

Worth a try for those with a whine.
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Old 01-05-2016, 05:57 PM   #22
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Old 01-05-2016, 07:30 PM   #23
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The center support can cause similar odd whine, but the pretty constant whine at various speeds under light load & quiet on no load coast is pretty typical of a differential, yes. Somewhat increasing intensity (up to a point, to the extent you can hear it over the increasing engine/car noise) especially when applying some throttle is typical of a screaming pinion bearing.
I'm starting to hear the opposite of this on the '91 245 (quiet when you get on the gas, whines more when coasting) but still only at certain speed ranges... still the diff, you think, vs. carrier bearing?
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Old 01-06-2016, 05:13 AM   #24
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I'm starting to hear the opposite of this on the '91 245 (quiet when you get on the gas, whines more when coasting) but still only at certain speed ranges... still the diff, you think, vs. carrier bearing?
I had a 240 with a constant differential whine relative to cruising speed, and the bearing eventually melted together bringing the car to a screeching stop on a dirt road. I was glad I wasn't driving down a main road in town when that happened! The cause of that was carrier bearing failure. Instead of replacing the bearing, just pulled an axle from the local junkyard...

If you get a whining at decel, or under changing loads, it could also be the ring and pinion lash that needs to be adjusted.
To recenter the ring and pinion, you'll have to take out the gears and put some shims under them to get them centered. Then you put some persian blue on the gears to check and see that the contact surfaces are nice and even.
Here's a link to a discussion on the procedure with a ford axle: http://www.mtfca.com/discus/messages...tml?1232164022

EDIT: Nice write-up on a Ford 8.8 and 9 inch assembly
http://diyford.com/ford-axle-ring-pi...ssembly-guide/
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Old 01-06-2016, 11:30 AM   #25
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What you need to do is pop the cover off and inspect/measure what is wrong in there/ If you burn it up you may end up needing a whole new pumpkin.


For the safety of those around you, I suggest you stop driving the car and fix the thing. Diff failures can cause you to spin out.
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