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  #16  
Old 06-05-2008, 07:02 PM
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Quote:
Originally Posted by jhodg5ck View Post
Diff oil really should be swapped every 50-06K to keep things looking nice inside.

Just the two drain plugs is all...drain is rear pass side, fill is on drivers upper/middle of the side of the case.

I like Redline/Lubro Moly/M1 syn. diff oil...works great in all my cars and they get a Work out!

Jonathan
cool. no need to open it up? I thought I read somewhere that there sould be sludge or something inside that needed to scooped out. I suppose though, with a couple of closely spaced oil changes it should be sufficent.
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  #17  
Old 06-05-2008, 08:18 PM
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There Shouldn't be any sludge in your diff....no clutches to wear out etc.. If there is sludge I would consider that a Very bad thing.. All I do is wear latex gloves and wiggle out what I can from the drain hole after it's done dripping.

If it's particularly dirty I'll spray a bunch of brake clean in the drain/fill hole..use paper towels etc to soak up what I can out of the bottom, fill the diff w/ a cheap fluid, run it up in the air for a few minutes, drain again and re-fill with the correct fluid.

Jonathan
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  #18  
Old 06-11-2008, 12:53 PM
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UPDATE:

well I changed the diff oil. sound is still there. So now it pretty much only leaves the bearing as the cause.

some notes on changing the diff oil:

- I needed a 14mm hex socket. I don't know about you but I didn't have one, so it took a little bit of driving to find one. I guess those larger sizes are not that popular.

- gear oil stinks. like dead-animal stinks. yuk.

- having some kind of pump that attaches to the new-oil bottle would have saved tons of time and oil that will find its way on you.


Time to order that bearing.
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  #19  
Old 06-11-2008, 02:43 PM
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Well, it still may Not be the bearing... Could just be wear on the gear set.. If they don't mesh Just right they'll make noise.

Again, I wouldn't worry...I know of diff's that have been droaning for Years w/o issue.

Jonathan
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  #20  
Old 09-09-2008, 04:38 PM
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for posterity, I replaced the driver-side rear wheel bearing and problem is 100% fixed. I had gotten so used to the sound its weird to drive and not hear it.
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  #21  
Old 09-09-2008, 06:00 PM
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I take it you had to purchase the press/tool etc...? The bearings are Surprisingly expensive, no?

Jonathan
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Jonathan Hodgman
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Enthusiast Service, Restoration & Tuning.
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Located in the Atlanta area
Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines.
Mercedes Repair Atlanta
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  #22  
Old 09-09-2008, 07:16 PM
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Quote:
Originally Posted by AtlBenz View Post
I haven't officially ruled out bearings, but I I kinda assumed they were too "small" to make such a prominent sound. I could be wrong. They shouldn't be that hard to change no?

I would be very surprised if the luggage rack was the cause of this sound. but I'll pull them off - gotta try all the hypothesis right?
I currently own 3 wagons and have owned wagons for most of my "driving life."

The cargo area of a wagon is like a boom box. It can amplify noises; especially suspension and/or road noises. So even a small noise is magnified.

As Mike suggested, the cross-bars on the roof rack can also make odd noises, especially with the sunroof open.
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  #23  
Old 09-09-2008, 10:07 PM
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The rear wheel bearings on the wagons are double row which means on a practical basis that the bearings will last a very long time after the noise starts before failing. To check the bearings, jack up the rear of the vehicle and alternately pull on the top and bottom of the tire to check the play. If the bearing is bad there will be substantial play. Also, the bottom of the outer brake pad and the top of the inner brake pad will wear considerably more than vice versa. The right wheel bearing on my 91 300TE was bad from about 130K miles until I replaced it at 170K miles with no ill effects other than premature rear brake pad wear and rear tire wear. Mark
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  #24  
Old 09-09-2008, 10:44 PM
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my '87 wagon we had a very similar sound. it somehow coincided (or so i thought) with installing new snow tires so i put it down to the tires and lived with the sound for most of a winter. then changed to summer tires and i knew immediately that i was wrong about it being from the tires and investigated and sure enough it was rear wheel bearings.
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